Get DIAGNOSTICS -> Automatic Transaxle (A246E) Guide for Toyota Avensis 4 Door First Generation (1997-2003)

DI–1

DIAGNOSTICS

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AUTOMATIC TRANSAXLE(A246E)

AUTOMATIC TRANSAXLE (A246E)

DI2L4–10

HOW TO PROCEED WITH TROUBLESHOOTING

Items inside

are titles of pages in this manual, with the

Vehicle Brought to Workshop

page number indicated in the bottom portion. See the indicated

pages for detailed explanations.

1

2

Customer Problem Analysis

P. DI–2

Connect the hand–held tester to DLC3.

If the display shows ”UNABLE TO CONNECT TO VEHICLE” when you have connected the

hand–held tester, inspect DLC3 P. DI–3

3

4

Check DTC and Freeze Frame Data (Precheck)

Record or Print DTC and Freeze Frame Data P DI–3

Clear DTC and Freeze Frame Data P. DI–15

Visual Inspection

5

6

Setting the Check Mode Diagnosis P. DI–3

Symptom does not occur

8

Symptom Simulation

7

Problem Symptom Confirmation

P. IN–20

Symptom occurs

9

11

DTC Check

P. DI–3

OK Code

NG

Basic Inspection

P. DI–3

OK

10

NG

12

Mechanical System Test

P. DI–3

DTC Chart

P. DI–15

OK

13

OK

NG

Manual Shifting Test

P. DI–3

14

Problem Symptoms Table– P. DI–18

NG

Chapter 1

(Electronic)

P. DI–18

Chapter 2

(On–Vehicle)

P. DI–18

Chapter 3

(Off–Vehicle)

P. DI–18

OK

NG

15

16

Parts Inspection

S O/D Main Switch & O/D OFF Indicator Light Check

S Kick–down Switch Circuit Check

Circuit

Inspection

P. DI–23 to DI–57

18

17

End

Repair

Confirmation Test

Identification of Problem

AVENSIS/CORONA SUP (RM781E)

DI–2

DIAGNOSTICS

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AUTOMATIC TRANSAXLE(A246E)

DI2L5–04

CUSTOMER PROBLEM ANALYSIS CHECK

Transaxle Control

System Check Sheet

Inspector’s

Name

:

Registration No.

Registration Year

Customer’s Name

/

Frame No.

Date Vehicle

Brought In

km

mile

/

Odometer Reading

Date Problem

Occurred

/

How Often Does

Problem Occur?

j Continuous

j Intermittent (

times a day)

j Vehicle does not move ( j Any range

j Particular range )

j No up–shift

( j 1st → 2nd j 2nd → 3rd j 3rd → O/D )

j No down–shift ( j O/D → 3rd j 3rd → 2nd j 2nd → 1st )

j Lock–up malfunction

j Shift point too high or too low

Symptoms

j Harsh engagement ( j N → D j Lock–up j Any drive range )

j Slip or shudder

j No kick–down

j Others

Malfunction

Indicator Light

Check Item

DTC Check

j Remains ON

j Normal

1st Time

2nd Time

j Normal code

j Malfunction code (Code

)

AVENSIS/CORONA SUP (RM781E)

DI–3

DIAGNOSTICS

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AUTOMATIC TRANSAXLE(A246E)

DI80A–01

PRE–CHECK

1.

DIAGNOSIS SYSTEM

(a) Description

S

When troubleshooting Euro–OBD vehicles, the

only difference from the usual troubleshooting pro-

cedure is that you connect an OBD scan tool com-

plying with ISO15031–4 or hand–held tester to the

vehicle, and read off various data output from the

vehicle’s engine and ECT ECU.

S

Euro–OBD regulations require that the vehicle’s

on–board computer lights up the check engine

warning light (CHK ENG) on the instrument panel

when the computer detects a malfunction in the

computer itself or in drive system components

which affect vehicle emissions. In addition to the

CHK ENG lighting up when a malfunction is de-

tected, the applicable DTCs prescribed by

ISO15031–6 are recorded in the engine and ECT

ECU memory (See page DI–15).

A13822

If the malfunction only occurs in 3 trips, the CHK

ENG goes off but the DTCs remain recorded in the

engine and ECT ECU memory.

S

To check the DTCs, connect an OBD scan tool or

hand–held tester to the Data Link Connector

(DLC3) on the vehicle. The OBD scan tool or hand–

held tester also enables you to erase the DTCs and

check freeze frame data and various forms of en-

gine data (For instruction book).

Hand–held Tester

DTCs include ISO controlled codes and manufac-

turer controlled codes.

DLC3

ISO controlled codes must be set as prescribed by

the ISO, while manufacturer controlled codes can

be set freely by the manufacturer within the pre-

scribed limits (See DTC chart on page DI–15).

D01600

AVENSIS/CORONA SUP (RM781E)

DI–4

DIAGNOSTICS

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AUTOMATIC TRANSAXLE(A246E)

S

The diagnosis system operates in normal mode

during normal vehicle use, and also has a check

mode for technicians to simulate malfunction symp-

toms and perform troubleshooting. Most DTCs use

2 trip detection logic(*) to prevent erroneous detec-

tion. By switching the engine and ECT ECU to

check mode when troubleshooting, the technician

can cause the CHK ENG to light up and for a mal-

function that is only detected once or momentarily.

(hand–held tester) (See page DI–3)

S

*2 trip detection logic:

When a logic malfunction is first detected, the mal-

function is temporarily stored in the engine andECT

ECU memory. If the same malfunction is detected

again during the 2nd test drive, this 2nd detection

causes the CHK ENG to light up .

(b) Inspect the DLC3.

The vehicle’s engine and ECT ECU uses ISO 9141–2 for

communication. The terminal arrangement of DLC3 com-

plies with ISO15031–3 and matches the ISO 9141–2 for-

mat.

1 2 3 4 5 6 7 8

910111213141516

DLC3

A04550

Testerconnection

Condition

Specifiedcondition

Pulsegeneration

1 Ω or less

7 (Bus ę Line) – 5 (Signal ground)

4 (Chassis Ground) – Body

16 (B+) – Body

Duringcommunication

Always

9 – 14 V

HINT:

If your display shows ”UNABLE TO CONNECT TO VEHICLE”

when you have connected the cable of OBD scan tool or hand–

held tester to the DLC3, turned the ignition switch ON and oper-

ated the scan tool, there is a problem on the vehicle side or tool

side.

S

If communication is normal when the tool is connected to

another vehicle, inspect the DLC3 on the original vehicle.

If communication is still not possible when the tool is con-

nected connected to another vehicle, the problem is prob-

ably in the tool itself, so consult the Service Department

listed in the tool’s instruction manual.

S

AVENSIS/CORONA SUP (RM781E)

DI–5

DIAGNOSTICS

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AUTOMATIC TRANSAXLE(A246E)

2.

INSPECT DIAGNOSIS (Normal Mode)

(a) Check the CHK ENG.

(1) The CHK ENG comes on when the ignition switch

is turned ON and the engine is not running.

HINT:

If the CHK ENG does not light up, troubleshoot the combination

meter (See page BE–1).

(2) When the engine is started, the CHK ENG should

go off. If the lamp remains on, the diagnosis system

has detected a malfunction or abnormality in the

system.

A13822

(b) Check the DTC.

NOTICE:

Hand–held Tester

Hand–held tester only: When the diagnostic system is

switched from the normal mode to the check mode, it

erases all DTCs and freeze frame data recorded in normal

mode. So before switching modes, always check the DTCs

and freeze frame data, and note them down.

(1) Prepare an OBD scan tool or hand–held tester.

(2) Connect the OBD scan tool or hand–held tester to

the DLC3 at the lower of the instrument panel.

(3) Turn the ignition switch ON and push the OBD scan

tool or hand–held tester switch ON.

DLC3

D01600

(4) Use the OBD scan tool or hand–held tester to check

the DTCs and freeze frame data and note them

down (For operating instructions, see the OBD scan

tool’s instruction book).

(5) See page DI–15 to confirm the details of the

DTCs.

NOTICE:

When simulating symptoms with an OBD scan tool (ex-

cluding hand–held tester) to check the DTCs, use normal

mode. For codes on the DTCs chart subject to ”2 trip detec-

tion logic”, turn the ignition switch OFF after the symptom

is simulated the 1st time. Then repeat the simulation pro-

cess again. When the problem has been simulated twice,

the CHK ENG is indicated on the instrument panel and

DTCs are recorded in the engine and ECT ECU.

AVENSIS/CORONA SUP (RM781E)

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DIAGNOSTICS

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AUTOMATIC TRANSAXLE(A246E)

3.

INSPECT DIAGNOSIS (Check Mode)

HINT:

Hand–held tester only: Compared to the normal mode, the

check mode has high sensing ability to detect malfunctions.

Furthermore, the same diagnostic items which are detected in

Normal mode can also be detected in the check mode.

(a) Check the DTC.

(1) Check the initial conditions.

S

Battery positive voltage 11 V or more.

Throttle valve fully closed.

Transaxle in P position.

A/C switched off.

(2) Turn the ignition switch OFF.

(3) Prepare the hand–held tester.

(4) Connect the hand–held tester to DLC3 at the lower

of the instrument panel.

Hand–held Tester

(5) Turn the ignition switch ON and switch the hand–

held tester ON.

DLC3

D01600

(6) Switch the hand–held tester from normal mode to

check mode (Check that the CHK ENG flashes).

(7) Start the engine (CHK ENG goes out after the en-

gine starts).

(8) Simulate the conditions of the malfunction de-

scribed by the customer.

0.13 sec.

ON

0.13 sec.

NOTICE:

OFF

Leave the ignition switch ON until you have checked the

DTCs, etc.

BR3904

(9) After simulating the malfunction conditions, use the

hand–held tester diagnosis selector to check the

DTCs and freeze frame data, etc.

HINT:

Take care not to turn the ignition switch OFF, as turning it off

switches the diagnosis system from check mode to normal

mode, so all DTCs, etc. are erased.

(10) After checking the DTC, inspect the applicable cir-

cuit.

AVENSIS/CORONA SUP (RM781E)

DI–7

DIAGNOSTICS

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AUTOMATIC TRANSAXLE(A246E)

(b) Clear the DTC.

The following actions will erase the DTC and freezed

frame data. Operating an OBD scan tool or hand–held

tester to erase the codes (See the OBD scan tool’s

instruction book for operating instructions.).

4.

PROBLEM SYMPTOM CONFIRMATION

Taking into consideration the results of the customer problem analysis, try to reproduce the symptoms of the

trouble. If the problem is that the transaxle does not shift up, shift down, or the shift point is too high or too

low conduct the following road test referring to the automatic shift schedule and simulate the problem symp-

toms.

5.

ROAD TEST

NOTICE:

Conduct the test at normal operating ATF temperature 50 – 80 °C (122 – 176 °F).

(a) D range test

Shift into the D range and fully depress the accelerator pedal and check the following points:

(1) Check up–shift operation.

Check to see that 1 → 2, 2 → 3 and 3 → O/D up–shift takes place, and that the shift points con-

form to the automatic shift schedule (See page SS–19).

HINT:

S

O/D Gear Up–shift Prohibition Control (1. Water temp. is 60 °C (140 °F) or less. 2. If there is a 10 km/h

(6 mph) difference between the set cruise control speed and vehicle speed.)

O/D Gear Lock–up Prohibition Control (1. Brake pedal is depressed. 2. Water temp. is 60 °C (140 °F)

or lower)

S

(2) Check for shift shock and slip.

Check for shock and slip at the 1 → 2, 2 → 3 and 3 → O/D up–shift.

(3) Check for abnormal noises and vibration.

Run in D range lock–up or O/D gear and check for abnormal noises and vibration.

HINT:

The check for the cause of abnormal noises and vibration must be done very thoroughly as it could also be

sure to loss of balance in the differential, torque converter, etc.

(4) Check kick–down operation.

While running in the D range, 2nd, 3rd and O/D gears, check to see that the possible kick–down

vehicle speed limits for 2 → 1, 3 → 2 and O/D → 3 kick–downs conform to those indicated in the

automatic shift schedule (See page SS–19).

(5) Check for abnormal shock and slip at kick–down.

(6) Check the lock–up mechanism.

S

Drive in D range O/D gear, at a steady speed (lock–up ON) of about 60 km/h (37 mph).

Lightly depress the accelerator pedal and check that the engine speed does not change

abruptly.

S

If there is a big jump in engine speed, there is no lock–up.

(b) 2 range test

Shift into the 2 range and fully depress the accelerator pedal and check the following points:

(1) Check up–shift operation.

Check to see that the 1 → 2 up–shift takes place and that the shift point conforms to the automatic

shift schedule (See page SS–19).

HINT:

There is no O/D up–shift and lock–up in the 2 range.

AVENSIS/CORONA SUP (RM781E)

DI–8

DIAGNOSTICS

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AUTOMATIC TRANSAXLE(A246E)

(2) Check engine braking.

While running in the 2 range and 2nd gear, release the accelerator pedal and check the engine

braking effect.

(3) Check for abnormal noises during acceleration and deceleration, and for shock at up–shift and

down–shift.

(c) L range test

Shift into the L range and fully depress the accelerator pedal and check the following points:

(1) Check no up–shift.

While running in the L range, check that there is no up–shift to 2nd gear.

(2) Check engine braking.

While running in the L range, release the accelerator pedal and check the engine braking effect.

(3) Check for abnormal noises during acceleration and deceleration.

(d) R range test

Shift into the R range and fully depress the accelerator pedal and check for slipping.

CAUTION:

Before conducting this test ensure that the test area is free from people and obstruction.

(e) P range test

Stop the vehicle on a grade (more than 5°) and after shifting into the P range, release the parking

brake. Then, check to see that the parking lock pawl holds the vehicle in place.

6.

BASIC INSPECTION

(a) Check the fluid level.

HINT:

Drive the vehicle so that the engine and transaxle are at normal

operating temperature.

Fluid temperature: 70 – 80 °C (158 – 176 °F)

(1) Park the vehicle on a level surface and set the park-

ing brake.

(2) With the engine idling and the brake pedal de-

pressed, shift the shift lever into all ranges from P

to L range and return to P range.

(3) Pull out the dipstick and wipe it clean.

(4) Push it back fully into the pipe.

D01529

(5) Pull it out and check that the fluid level is in the HOT

range.

OK if hot

If the level is not within the range, add new fluid.

Fluid type: ATF Type D–II or DEXRON®III (DEXRON®II)

NOTICE:

Add if hot

Do not overfill.

(b) Check the fluid condition.

If the fluid smells burnt or is black, replace it.

AT3417

AVENSIS/CORONA SUP (RM781E)

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DIAGNOSTICS

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AUTOMATIC TRANSAXLE(A246E)

(c) Replace the ATF.

(1) Remove the drain plug and drain the fluid.

(2) Reinstall the drain plug securely.

F00483

Z13623

AT3417

(3) With the engine OFF add new fluid through the oil

filler pipe.

Fluid type: ATF Type D–II or DEXRON®III (DEXRON®II)

Capacity: 3.1 liters (3.3 US qts, 2.7 Imp.qts)

(4) Start the engine and shift the shift lever into all

ranges from P to L range and then shift into P range.

(5) With the engine idling, check the fluid level. Add

fluid up to the COOL level on the dipstick.

(6) Check the fluid level at the normal operating tem-

perature, 70 – 80 °C (158 – 176 °F), and add as

necessary.

OK if hot

Add if hot

NOTICE:

Do not overfill.

(d) Check the fluid leaks.

Check for leaks in the transaxle.

If there are leaks, it is necessary to repair or replace O–rings,

FIPGs, oil seals, plugs or other parts.

(e) Inspect and adjust the shift lever range.

When shifting the shift lever from the N range to the other

range, check that the lever can be shifted smoothly and

accurately to each range and that the range indicator cor-

rectly indicates the range.

If the indicator is not aligned with the correct range, carry out the

following adjustment procedures:

(1) Loosen the nut the control shaft lever.

(2) Push the control shaft lever fully downward.

Q08545

AVENSIS/CORONA SUP (RM781E)

DI–10

DIAGNOSTICS

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AUTOMATIC TRANSAXLE(A246E)

(3) Return the control shaft lever 2 notches to the N

range.

(4) Set the shift lever to N range.

(5) While holding the shift lever lightly toward the R

range side, tighten the shift lever nut.

Torque: 12 N·m (120 kgf·cm, 9 ft·lbf)

(6) Start the engine and make sure that the vehicle

moves forward when shifting the lever from the N to

D range and reveres when shifting it to the R range.

Q02281

(f)

Inspect and adjustment the neutral start switch.

Check that the engine can be started with the shift lever

only in the N or P range, but not in other ranges.

If not as started above, carry out the following adjustment pro-

cedures:

Neutral

Basic Line

(1) Loosen the neutral start switch bolt and set the shift

lever to the N range.

Groove

(2) Align the groove and the neutral basic line.

(3) Holding the shift selector, and tighten the bolt.

Torque: 5.4 N·m (55 kgf·cm, 48 in.·lbf)

HINT:

Q02284

For continuity inspection of the neutral start switch, see page

DI–45.

AVENSIS/CORONA SUP (RM781E)

DI–11

DIAGNOSTICS

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AUTOMATIC TRANSAXLE(A246E)

7.

MECHANICAL SYSTEM TESTS

(a) Measure the stall speed.

The object of this test is to check the overall performance of the transaxle and engine by measuring

the stall speeds in the D and R ranges.

NOTICE:

S

Do the test at normal operating ATF temperature 50 – 80 °C (122 – 176 °F).

Do not continuously run this test for longer than 5 seconds.

To ensure safety, do this test in a wide, clear level area which provides good traction.

The stall test should always be carried out in pairs. One technician should observe the condi-

tions of wheels or wheel stoppers outside the vehicle while the other is doing the test.

(1) Chock the 4 wheels.

(2) Connect a hand–held tester to DLC3.

(3) Fully apply the parking brake.

(4) Keep your left foot pressing firmly on the brake pedal.

(5) Start the engine.

(6) Shift into the D range. Press all the way down on the accelerator pedal with your right foot.

(7) Quickly read the stall speed at this time.

Stall speed: 2,500 ± 150 rpm

(8) Do the same test in the R range.

Stall speed: 2,500 ± 150 rpm

Evaluation:

Problem

Possible cause

S Engine output may be insufficient

S Stator one–way clutch not operating properly

HINT: If more than 600 rpm below the specified value, the torque

converter could be faulty.

(a) Stall speed low in D and R ranges

(b) Stall speed high in D range

S Line pressure too low

S Forward clutch slipping

S One–way clutch No.2 not operating properly

S U/D one–way clutch not operating properly

S Line pressure too low

S Reverse clutch slipping

S 1st and reverse brake slipping

S U/D brake slipping

(c) Stall speed high in R range

S Line pressure too low

(d) Stall speed high in D and R ranges

S Improper fluid level

S U/D one–way clutch not operating properly

AVENSIS/CORONA SUP (RM781E)

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DIAGNOSTICS

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AUTOMATIC TRANSAXLE(A246E)

(b) Measure the time lag.

When the shift lever is shifted while the engine is idling, there will be a certain time lapse or lag before

the shock can be felt. This is used for checking the condition of the O/D direct clutch, forward clutch,

and 1st and reverse brake.

NOTICE:

S

Do the test at normal operating ATF temperature 50 – 80 °C (122 – 176 °F).

Be sure to allow 1 minute interval between tests.

Take 3 measurements and take the average value.

(1) Chock the 4 wheels.

(2) Connect a hand–held tester to DLC3.

(3) Start engine and check idle speed.

Idle speed: 700 ± 50 rpm (In N range and A/C OFF)

(4) Shift the lever from N to D range. Using a stop watch, measure the time from when the lever is

shifted until the shock is felt.

Time lag: N → D less than 1.2 seconds

(5) In the same way, measure the time lag for N → R.

Time lag: N → R less than 1.5 seconds

Evaluation (If N → D or N → R time lag is longer than the specified):

Problem

Possible cause

S Line pressure too low

N → D time lag is longer

N → R time lag is longer

S Forward clutch worn

S U/D one–way clutch not operating properly

S Line pressure too low

S Improper fluid level

S Direct clutch worn

S 1st and reverse brake worn

AVENSIS/CORONA SUP (RM781E)

DI–13

DIAGNOSTICS

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AUTOMATIC TRANSAXLE(A246E)

8.

HYDRAULIC TEST

Measure the line pressure.

NOTICE:

S

Do the test at normal operation ATF temperature 50 – 80 °C (122 – 176 °F).

S

The line pressure test should always be carried out in pairs. One technician should observe

the conditions of wheels or wheel stopper outside the vehicle while the other is doing the test.

Be careful to prevent SST’s hose from interfering with the exhaust pipe.

(1) Warm up the ATF.

S

(2) Remove the test plug on the rear side of the transaxle case and connect SST (See page AX–28

for the location to connect SST).

SST 09992–00095 (09992– 00231, 09992–00271)

(3) Fully apply the parking brake and chock the 4 wheels.

(4) Connect a hand–held tester to DLC3.

(5) Start the engine and check idling speed.

(6) Keep your left foot pressing firmly on the brake pedal and shift into D range.

(7) Measure the line pressure when the engine is idling.

(8) Depress the accelerator pedal all the way down. Quickly read the highest line pressure when

engine speed reaches stall speed.

(9) In the same way, do the test in R range.

Specified line pressure:

2

Condition

Idling

D range

kPa (kgf / cm , psi)

R range

kPa (kgf / cm , psi)

372 – 441 (3.8 – 4.5, 54 – 64)

598 – 716 (6.1 – 7.3, 87 – 104)

Stall

981 – 1,138 (10.0 – 11.6, 142 – 165)

1,392 – 1,726 (14.2 – 17.6, 202 – 250)

Evaluation:

Problem

Possible cause

S SLT solenoid valve defective

If the measured values at all ranges are higher

If the measured values at all ranges are lower

S Regulator valve detective

S SLT solenoid valve defective

S Regulator valve defective

S Oil pump defective

S O/D direct clutch defective

S D range circuit fluid leakage

If pressure is low in the D range only

If pressure is low in the R range only

S Forward clutch defective

S R range circuit fluid leakage

S Direct clutch defective

S 1st and reverse brake defective

AVENSIS/CORONA SUP (RM781E)

DI–14

DIAGNOSTICS

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AUTOMATIC TRANSAXLE(A246E)

9.

MANUAL SHIFTING TEST

HINT:

By this test, it can be determined whether the trouble is within

the electrical circuit or is a mechanical problem in the transaxle.

(a) Disconnect the solenoid wire.

(b) Inspect the manual driving operation.

Check that the shift and gear positions correspond to the

table below.

While driving, shift through the L, 2 and D ranges.

Check that the gear change corresponds to the shift

range.

Q02283

Shiftrange

Gearposition

O/D

D

2

3rd

L

1st

R

P

Reverse

Pawl Lock

HINT:

If the L, 2 and D range gear positions are difficult to distinguish,

do the above read test.

If any abnormality is found in the above test, the problem is in

the transaxle itself.

(c) Connect the solenoid wire.

(d) Cancel out the DTC.

AVENSIS/CORONA SUP (RM781E)

DI–15

DIAGNOSTICS

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AUTOMATIC TRANSAXLE(A246E)

DI1FQ–05

DIAGNOSTIC TROUBLE CODE CHART

If a DTC is displayed during the DTC check, check the circuit listed for that code in the table below and pro-

ceed to the page given.

DTC No.

Check engine

*2

DetectionItem

TroubleArea

Memory

*1

(See Page)

warning light

S Open or short in vehicle speed sensor circuit

S Vehicle speed sensor

P0500

Vehicle speed sensor

malfunction

S Combinationmeter

f

(DI–23)

S Engine and ECT ECU

S Automatic transaxle (clutch, brake or gear etc.)

S No. 1 solenoid valve is stuck open or closed

3

P0750 *

Shift solenoid ”A” malfunction

(No. 1 solenoid valve)

S Valve body is blocked up or stuck

f

(DI–26)

S Automatic transaxle (clutch, brake or gear etc.)

Shift solenoid ”A” electrical

malfunction

S Open or short in No. 1 solenoid valve circuit

P0753

S No. 1 solenoid valve

(DI–28)

(No. 1 solenoid valve)

S Engine and ECT ECU

S No.2 solenoid valve is stuck open or closed

3

P0755 *

Shift solenoid ”B” malfunction

(No. 2 solenoid valve)

S Valve body is blocked up or stuck

(DI–26)

S Automatic transaxle (clutch, brake or gear etc.)

Shift solenoid ”B” electrical

malfunction

S Open or short in No.2 solenoid valve circuit

P0758

S No.2 solenoid valve

(DI–28)

(No. 2 solenoid valve)

S Engine and ECT ECU

S SL solenoid valve is stuck open or closed

S Valve body is blocked up or stuck

S Lock–up clutch

3

P0770 *

Shift solenoid ”E” malfunction

(SL solenoid valve)

f

(DI–32)

S Automatic transaxle (clutch, brake or gear etc.)

Shift solenoid ”E” electrical

malfunction

S Open or short in SL solenoid valve circuit

P0773

S SL solenoid valve

f

(DI–34)

(SL solenoid valve)

S Engine and ECT ECU

S Open or short in stop light switch signal circuit

P1520

Stop light switch

S Stop light switch

(DI–37)

signalmalfunction

S Engine and ECT ECU

Linearsolenoidline

pressure control circuit

malfunction

S Open or short in SLT solenoid valve circuit

S SLT solenoid valve

P1760

f

(DI–42)

S Engine and ECU ECU

(SLT solenoid valve)

S Short in neutral start switch circuit

S Neutral start switch

P1780

Neutral start switch

malfunction

(DI–45)

S Engine and ECT ECU

*1: ”f” mark means Check engine warning light blinks once every 2 seconds.

”X” mark means Check engine warning light never blinks.

*2: ”f” mark means Engine and ECT ECU memorizes the malfunction code if the Engine and ECT ECU

detects the DTC detection condition.

*3: European spec. only

AVENSIS/CORONA SUP (RM781E)

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–

AUTOMATIC TRANSAXLE(A246E)

PARTS LOCATION

DI1FR–05

No. 1 Solenoid Valve

No. 2 Solenoid Valve

Neutral Start Switch

SLT Solenoid Valve

SL Solenoid Valve

O/D OFF Indicator

LHD:

Kick–down Switch

DLC3

Stop Light Switch

O/D Main Switch

Engine and ECT ECU

Pattern Select Switch

D09911

AVENSIS/CORONA SUP (RM781E)

DI–17

DIAGNOSTICS

–

AUTOMATIC TRANSAXLE(A246E)

DI77O–02

TERMINALS OF ECU

Engine and ECT ECU Terminals

E20

E21

E19

E18

9

8 7 6 5 4 3

2 1

7 6 5 4 3

2 1

9 8 7

6 5 4 3 2 1

7 6

5 4 3 2 1

21201918 17161514131211 10 1615141312 11 10 9 8

313029 2827 2625242322 242322 2120191817

19181716 15141312 11 10 15141312 11 10 9 8

282726252423 222120 2221201918 1716

D05962

Symbols (TerminalsNo.)

S1 (E18–8) – E1 (E19–17)

WiringColor

Condition

STD Voltage (V)

9 – 14

IG ON

LG ↔ BR

1st or 2nd gear

3rd or O/D gear

IG ON

9 – 4

Below 1.5

9 – 4

S2 (E18–20) – E1 (E19–17)

V–W ↔ BR

2nd or 3rd gear

1st or O/D gear

IG ON

Below 1.5

9 – 14

SL (E18–19) – E1 (E19–17)

OD2 (E20–19) – E1 (E19–17)

L (E20–12) – E1 (E19–17)

2 (E20–3) – E1 (E19–17)

R (E20–2) – E1 (E19–17)

NSW (E20–13) – E1 (E19–17)

P ↔ BR

L ↔ BR

Vehicle driving under lock–up position

O/D main switch ON (O/D OFF)

Below 3

9 – 14

O/D main switch OFF (O/D ON)

IG ON and Shift lever L range

7.5 – 14

Below 1.5

7.5 – 14

Below 1.5

7.5 – 14

Below 1.5

Below 3

9 –14

Y–G ↔ BR

O ↔ BR

IG ON and Shift lever other than L range

IG ON and Shift lever 2 range

IG ON and Shift lever other than 2 range

IG ON and Shift lever R range

R–B ↔ BR

B–W ↔ BR

IG ON and Shift lever other than R range

IG ON and Shift lever P or N range

IG ON and Shift lever other than P or N range

IG ON

+

–

SLT (E18–6) – SLT (E18–5)

LG–B ↔ P–B

G ↔ BR

9 – 14

SPD (E20–22) – E1 (E19–17)

IG ON and rotate driving wheel slowly

IG ON and accelerator pedal fully depressed

IG ON and accelerator pedal released

IG ON and brake pedal depressed

IG ON and brake pedal released

IG ON and pattern select switch: PWR

IG ON and pattern select switch: NORM

IG ON and SNOW mode switch: ON

IG ON and SNOW mode switch: OFF

Pulsegeneration

Below 1.5

9 – 14

KD (E20–4) – E1 (E19–17)

STP (E20–6) – E1 (E19–17)

PWR (E20–28) – E1 (E19–17)

SNWI (E20–16) – E1 (E19–17)

Y ↔ BR

G–W ↔ BR

P ↔ BR

9 – 14

Below 1.5

9 – 14

Below 1.5

9 – 14

P–B ↔ BR

Below 1.5

AVENSIS/CORONA SUP (RM781E)

DI–18

DIAGNOSTICS

–

AUTOMATIC TRANSAXLE(A246E)

DI1FT–06

PROBLEM SYMPTOMS TABLE

If a normal code is displayed during the diagnostic trouble code check but the trouble still occurs, check the

circuits for each symptom in the order given in the charts on the following pages and proceed to the page

given for troubleshooting.

HINT:

The Matrix Chart is divided tnto 3 chapters.

Chapter 1: Electronic circuit matrix chart

Chapter 2: On–vehicle repair matrix chart

Chapter 3: Off–vehicle repair matrix chart

If the instruction ”Proceed to next circuit inspection shown on matrix chart” is given in the flow chart for eaxh

circuit, proceed to the circuit with the next highest number in the table to continue the check.

If the trouble still occurs even though there are no abnormalities in any of the other circuits, then check and

replace the Engine and ECT ECU.

Chapter 1: Electronic circuit matrix chart

Symptom

Suspect Area

See page

IN–30

No up–shift

Engine and ECT ECU

(A particular gear, from 1st to 3rd gear, is not up–shifted)

No up–shift

1. O/D main switch & O/D OFF indicator light circuit

2. Engine and ECT ECU

DI–49

IN–30

(3rd → O/D)

Nodown–shift

1. O/D main switch & O/D OFF indicator light circuit

2. Engine and ECT ECU

DI–49

IN–30

(O/D → 3rd)

No down–shift

Engine and ECT ECU

IN–30

(A particular gear, from 1st to 3rd gear, is not down–shifted)

No lock–up

Engine and ECT ECU

IN–30

No lock–up OFF

Shift point too high or too low

1. O/D main switch & O/D OFF indicator light circuit

2. Engine and ECT ECU

DI–49

IN–30

Up–shift to O/D from 3rd while O/D main switch is OFF

Up–shift to O/D from 3rd while engine is cold

No kick–down

Engine and ECT ECU

IN–30

1. Kick–down switch circuit

2. Engine and ECT ECU

DI–57

IN–30

Engine stalls when starting off or stopping

Engine and ECT ECU

IN–30

AVENSIS/CORONA SUP (RM781E)

DI–19

DIAGNOSTICS

–

AUTOMATIC TRANSAXLE(A246E)

Chapter 2: On–vehicle repair

(L : A245E automatic transaxle repair manual Pub. No. RM757E)

Symptom

Does not move in any forward ranges

Does not move in reverse range

Suspect Area

See page

Off–vehicle matrix chart

–

1. Primary regulator valve

2. Manualvalve

L

–

Does not move in any range

3. Off–vehicle matrix chart

No–up shift

1. 1 – 2 shift valve

L

(1st → 2nd)

2. Off–vehicle matrix chart

–

No–up shift

1. 2 – 3 shift valve

L

(2nd → 3rd)

2. Off–vehicle matrix chart

–

No–up shift

1. 3 – 4 shift valve

L

(3rd → O/D)

2. Off–vehicle matrix chart

–

No–downshift

1. 3 – 4 shift valve

L

(O/D → 3rd)

2. Off–vehicle matrix chart

–

No–downshift

1. 2 – 3 shift valve

L

(3rd → 2nd)

2. Off–vehicle matrix chart

–

No–downshift

1. 1 – 2 shift valve

L

(2nd → 1st)

2. Off–vehicle matrix chart

–

Harshengagement

1. C accumulator

L

2

(N → R)

2. Off–vehicle matrix chart

–

Harshengagement

1. C accumulator

L

1

(N → D)

2. Off–vehicle matrix chart

–

1. C accumulator

L

–

1

Harshengagement

2. Low coast modulator valve

3. Off–vehicle matrix chart

(N → L)

1. Accumulator control valve

L

–

Harshengagement

2. B accumulator

2

(1st → 2nd ”D” range)

3. Off–vehicle matrix chart

1. B accumulator

L

–

2

Harshengagement

2. Accumulator control valve

3. 2nd coast modulator control

4. Off–vehicle matrix chart

(1st → 2nd ”2” range)

Harshengagement

Primary regulator valve

L

(1st → 2nd → 3rd → O/D)

1. C accumulator

L

–

2

Harshengagement

2. Accumulator control valve

3. Off–vehicle matrix chart

(2nd → 3rd)

1. B accumulator

L

–

2

Harshengagement

2. C accumulator

3

(3rd → O/D)

3. Off–vehicle matrix chart

Harshengagement

1. B accumulator

L

4

(O/D → 3rd)

2. Off–vehicle matrix chart

–

Harshengagement

1. C accumulator

L

2

(3rd → 2nd)

2. Off–vehicle matrix chart

–

1. Primary regulator valve

2. Oil strainer

L

AX–4

–

Slip (Forward & Reverse)

3. Off–vehicle matrix chart

Slip (”R” range, 1st, 2nd, 3rd, O/D)

Off–vehicle matrix chart

–

AVENSIS/CORONA SUP (RM781E)

DI–20

DIAGNOSTICS

–

AUTOMATIC TRANSAXLE(A246E)

Suspect Area

Symptom

See page

1. Low coast modulator valve

2. Off–vehicle matrix chart

L

No engine braking (1st ”L” range)

No engine braking (2nd ”2” range)

–

1. 2nd coast modulator valve

2. Off–vehicle matrix chart

L

–

1. 1 – 2 shift valve

2. 2 – 3 shift valve

3. 3 – 4 shift valve

L

No kick down

1. Primary regulator valve

2. Off–vehicle matrix chart

L

Pooracceleration

No lock–up

–

1. Lock–up relay valve

L

2. Off–vehicle matrix chart

–

AVENSIS/CORONA SUP (RM781E)

DI–21

DIAGNOSTICS

–

AUTOMATIC TRANSAXLE(A246E)

Chapter 3: Off–vehicle repair

(L : A245E automatic transaxle repair manual Pub. No. RM757E)

Symptom

Suspect Area

See page

Does not move in any forward ranges

Forward clutch (C )

L

1

1. Direct clutch (C )

2

Does not move in reverse range

Does not move in any ranges

2. 1st and reverse brake (B )

3

3. U/D brake (B )

4

1. Torqueconverter

2. Oil pump

AX–33

L

3. U/D one–way clutch (F )

3

4. Front planetary gear

5. Rear planetary gear

No–up shift

1. 2nd brake (B )

L

2

(1st → 2nd)

2. No.1 one–way clutch (F )

L

1

No–up shift

Direct clutch (C )

L

2

(2nd → 3rd)

No–up shift

U/D clutch (C )

3

(3rd → O/D)

No–downshift

1. U/D brake (B )

L

4

(O/D → 3rd)

2. U/D one–way clutch (F )

3

No–downshift

No.1 one–way clutch (F )

L

1

(3rd → 2nd)

No–downshift

No.2 one–way clutch (F )

L

2

(2nd → 1st)

Harshengagement

1. Direct clutch (C )

L

2

(N → R)

2. 1st and reverse brake (B )

3

Harshengagement

1. Forward clutch (C )

L

1

(N → D)

2. On–vehicle matrix chart

–

Harshengagement

Forward clutch (C )

L

1

(N → L)

Harshengagement

1. 2nd brake (B )

L

2

(1st → 2nd ”D” range)

2. No.1 one–way clutch (F )

1

1. 2nd coast brake (B )

L

1

Harshengagement

2. 2nd brake (B )

2

(1st → 2nd ”2” range)

3. No.1 one–way clutch (F )

1

Harshengagement

Direct clutch (C )

L

2

(2nd → 3rd)

Harshengagement

U/D clutch (C )

3

(3rd → O/D)

Harshengagement

U/D brake (B )

4

(O/D → 3rd)

Harshengagement

Direct clutch (C )

2

(3rd → 2nd)

1. Torqueconverter

2. Oil pump

AX–33

Slip (Forward & Reverse)

Slip (”R” range)

L

1. Direct clutch (C )

L

2

2. 1st and reverse brake (B )

L

3

1. Forward clutch (C )

L

1

Slip (1st)

2. No.2 one–way clutch (F )

2

3. U/D one–way clutch (F )

3

AVENSIS/CORONA SUP (RM781E)

DI–22

DIAGNOSTICS

–

AUTOMATIC TRANSAXLE(A246E)

Suspect Area

Symptom

See page

1. Forward clutch (C )

L

1

2. 2nd brake (B )

2

Slip (2nd)

3. No.1 one–way clutch (F )

1

4. U/D one–way clutch (F )

3

1. Forward clutch (C )

1

Slip (3rd)

Slip (O/D)

2. Direct clutch (C )

2

3. U/D one–way clutch (F )

3

1. Forward clutch (C )

1

2. Direct clutch (C )

2

3. U/D clutch (C )

3

No engine braking (1st ”L” range)

No engine braking (2nd ”2” range)

1st and reverse brake (B )

3

2nd coast brake (B )

1

1. Torqueconverter

AX–33

Pooracceleration

2. Forward clutch (C )

L

1

No lock–up

Torqueconverter

AX–33

Engine stalls when starting off or stopping

AX–33

AVENSIS/CORONA SUP (RM781E)

DI–23

DIAGNOSTICS

–

AUTOMATIC TRANSAXLE(A246E)

DI3VC–05

CIRCUIT INSPECTION

DTC P0500 Speed Sensor Malfunction

The No.1 speed sensor outputs a 4–pulse signal for every revolution of the transaxle output shaft.

After this signal is converted into a more precise rectangular waveform by the waveform shaping circuit in-

side the combination meter, it is then transmitted to the Engine and ECT ECU.

4–pulse

From

Speed

Sensor

Engine and

ECT ECU

ABS ECU

Combination

Meter

A00022

DTC No.

P0500

DTCDetectingCondition

TroubleArea

S Open or short in vehicle speed sensor circuit

S Vehicle speed sensor

No vehicle speed sensor signal to Engine and ECT ECU dur-

ing vehicle driving (2 trip detection logic)

S Engine and ECT ECU

S Combinationmeter

WIRING DIAGRAM

Engineand ECT ECU

Combination Meter

J44

Junction

Connector

22

18

C10

G

D

G

E20

SPD

D10040

AVENSIS/CORONA SUP (RM781E)

DI–24

DIAGNOSTICS

–

AUTOMATIC TRANSAXLE(A246E)

INSPECTION PROCEDURE

1

Check operation of speedometer.

CHECK:

Drive the vehicle and check if the operation of the speedometer in the combination meter is normal.

HINT:

The vehicle speed sensor is operating normally if the speedometer display is normal.

NG

Check speedometer circuit. See combination

meter troubleshooting.

OK

2

Check voltage between terminal SPD of Engine and ECT ECU connector and

body ground.

PREPARATION:

(a) Turn up the floor mat on the passenger side.

(b) Remove the 2 bolts for Engine and ECT ECU.

(c) Shift the shift lever to N range.

(d) Jack up one of the front wheels.

(e) Turn ignition switch ON.

ON

(+)

(–)

CHECK:

SPD

Measure voltage between terminal SPD of Engine and ECT

ECU connector and body ground when the wheel is turned

slowly.

D07192

OK:

Voltage is generated intermittently.

4.5 – 5.5 V

Turn the wheel

D02247

NG

Check and repair harness and connector be-

tween combination meter and Engine and ECT

ECU.

OK

AVENSIS/CORONA SUP (RM781E)

DI–25

DIAGNOSTICS

–

AUTOMATIC TRANSAXLE(A246E)

3

Check Engine and ECT ECU (See page IN–30).

NG

Replace Engine and ECT ECU.

OK

Check and repair ABS system.

AVENSIS/CORONA SUP (RM781E)

DI–26

DIAGNOSTICS

–

AUTOMATIC TRANSAXLE(A246E)

DI1FV–05

DTC

P0750,P0755

Shift Solenoid A/B Malfunction

(No. 1/No. 2 Solenoid Valve )

SYSTEM DESCRIPTION

The Engine and ECT ECU uses signals from the vehicle speed sensor and crankshaft position sensor to

detect the actual gear position (1st, 2nd, 3rd or O/D gear).

Then the Engine and ECT ECU compares the actual gear with the shift schedule in the Engine and ECT

ECU memory to detect the mechanical trouble of the shift solenoid valves, the valve body or automatic trans-

axle (clutch, brake or gear etc.).

DTC No.

DTCDetectingCondition

TroubleArea

During normal driving, the gear required by the Engine and

ECT ECU does not match the actual gear

(2–tripdetectionlogic)

S No. 1/No. 2 solenoid valve is stuck open or closed

S Valve body is blocked up or stuck

P0750

P0755

S Automatic transaxle (clutch, brake or gear etc.)

HINT:

Check the No. 1 solenoid valve when DTC P0750/62 is output and check the No. 2 solenoid valve when DTC

P0755/63 is output.

INSPECTION PROCEDURE

1

Check No. 1 or No. 2 solenoid valve operation.

PREPARATION:

(a) Remove the oil pan.

(+)

(–)

(b) Remove the No. 1 or No. 2 solenoid valve .

CHECK:

(–)

(+)

(a) Applying 490 kPa (5 kgf/cm², 71 psi) of compressed air,

check that the solenoid valve does not leak the air.

(b) When battery voltage is supplied to the shift solenoid

valve, check that the valve opens.

OK:

Air

D04318

(a) Solenoid valve does not leak air.

(b) Solenoid valve opens.

NG

Replace the No. 1 or No. 2 solenoid valve.

OK

AVENSIS/CORONA SUP (RM781E)

DI–27

DIAGNOSTICS

–

AUTOMATIC TRANSAXLE(A246E)

2

Check the valve body (See chapter 2 in the problem symptoms table).

NG

Repair or replace the valve body.

OK

Repair the transaxle (See page AX–28).

AVENSIS/CORONA SUP (RM781E)

DI–28

DIAGNOSTICS

–

AUTOMATIC TRANSAXLE(A246E)

DI1FW–06

DTC

P0753,P0758

Shift Solenoid A/B Electrical Malfunc-

tion (No. 1/No. 2 Solenoid Valve)

CIRCUIT DESCRIPTION

Shifting from 1st to O/D is performed in combination with ON and OFF of the No. 1 and No. 2 solenoid valves

controlled by Engine and ECT ECU. If an open or short circuit occurs in either of the solenoid valves, the

Engine and ECT ECU controls the remaining normal solenoid valve to allow the vehicle to be operated

smoothly (Fail safe function).

SHIFT SOLENOID NO.1

MALFUNCTIONING

SHIFT SOLENOID NO.2

MALFUNCTIONING

BOTH SOLENOID

MALFUNCTIONING

NORMAL

Solenoidvalve

Position

Solenoidvalve

Gear

Solenoidvalve

Gear

Gear when shift selector is

manuallyoperated

Gear

No.1

ON

No.2

OFF

No.1

X

No.2

ON

No.1

ON

No.2

X

1st

3rd

1st

O/D

ON

2nd

X

ON

OFF

X

O/D

D

2

OFF

ON

3rd

X

ON

3rd

OFF

ON

X

O/D

OFF

O/D

OFF

O/D

ON

OFF

1st

X

ON

3rd

X

1st

3rd

ON

2nd

3rd

X

ON

3rd

OFF

X

O/D

3rd

OFF

ON

OFF

ON

1st

X

OFF

ON

1st

ON

X

1st

L

2nd

X:Malfunctions

HINT:

Check the No. 1 solenoid valve when DTC P0753/62 is output and check the No. 2 solenoid valve when

DTC P0758/63 is output.

DTC No.

DTCDetectingCondition

TroubleArea

The Engine and ECT ECU checks for an open or short circuit

in the No. 1 or No. 2 solenoid valve circuit when it changes.

The Engine and ECT ECU records DTC P0753/62 or

P0758/63 if condition (a) or (b) is detected once, but it does not

blink the O/D OFF indicator light.

After Engine and ECT ECU detects condition (a) or (b) continu-

ously 8 times or more in one–trip, it causes the O/D OFF indi-

cator light to light up until condition (a) or (b) disappears.

After that, if the Engine and ECT ECU detects condition (a) or

(b) once, it starts lighting up O/D OFF indicator light again.

S Open or short in No. 1/No. 2 solenoid valve circuit

S No. 1/No. 2 solenoid valve

P0753

P0758

S Engine and ECT ECU

(a) Solenoid resistance is 8 Ω or less (short circuit) when the

solenoid is energized.

(b) Solenoid resistance is 100 kΩ or more (open circuit) when

the solenoid is not energized.

Fail safe function:

If either of the solenoid valve circuits develops an open or short, the Engine and ECT ECU turns the other

solenoid valve ON and OFF to shift to the gear positions shown in the table above. The Engine and ECT

ECU also turns the ST solenoid valve OFF at the same time. If both solenoids malfunction, hydraulic control

cannot be performed electronically and must be done manually.

Manual shifting as shown in the above table must be done (In the case of a short circuit, the Engine and ECT

ECU stops sending current to the short circuited solenoid).

AVENSIS/CORONA SUP (RM781E)

DI–29

DIAGNOSTICS

–

AUTOMATIC TRANSAXLE(A246E)

WIRING DIAGRAM

Engine and ECT ECU

Transaxle

No. 1 Solenoid Valve

8

E18

3

E1

12

IE2 IF2

(RHD)(LHD)

12

LG

S1

No. 2 Solenoid Valve

6

E1

20

E18 S2

11

IE2 IF2

11

V–W

(RHD)(LHD)

D10180

INSPECTION PROCEDURE

1

Measure resistance between terminal S1 or S2 of Engine and ECT ECU connec-

tor and body ground.

PREPARATION:

Disconnect the connector from Engine and ECT ECU.

CHECK:

Measure resistance between the terminal S1 or S2 of Engine

and ECT ECU connector and the body ground.

S1

OK:

S2

Resistance: 11 – 15 Ω at 20°C (68°F)

D07193

OK

Check and replace Engine and ECT ECU (See

page IN–30).

NG

AVENSIS/CORONA SUP (RM781E)

DI–30

DIAGNOSTICS

–

AUTOMATIC TRANSAXLE(A246E)

2

Check harness and connector between Engine and ECT ECU and automatic

transaxle solenoid connector.

PREPARATION:

Disconnect the solenoid connector from the automatic trans-

axle.

CHECK:

S1

S2

Check harness and connector between the terminal S1 or S2

of Engine and ECT ECU and the terminal S1 or S2 of solenoid

S1

connector.

OK:

S2

There is no open and short circuit.

D08713

NG

Repair or replace harness or connector.

OK

AVENSIS/CORONA SUP (RM781E)

DI–31

DIAGNOSTICS

–

AUTOMATIC TRANSAXLE(A246E)

3

Check No. 1 or No. 2 solenoid valve.

PREPARATION:

(a) Jack up the vehicle.

(b) Remove the oil pan.

(c) Disconnect the solenoid connector.

(d) Remove the No. 1 or No. 2 solenoid valve .

CHECK:

(a) Measure resistance between the solenoid connector and

the solenoid body.

(b) Connector positive ę lead to the terminal of solenoid con-

nector, negative Ĝ lead to the solenoid body.

OK:

(a) Resistance: 11 – 15 Ω at 20°C (68°F)

(b) The solenoid makes an operating noise.

(+)

(–)

Q08083

Q08084

D04317

NG

Replace shift solenoid valve.

OK

Repair or replace solenoid wire.

AVENSIS/CORONA SUP (RM781E)

DI–32

DIAGNOSTICS

–

AUTOMATIC TRANSAXLE(A246E)

DI1FX–05

DTC

P0770 Shift Solenoid E Malfunction

(SL Solenoid Valve)

SYSTEM DESCRIPTION

The Engine and ECT ECU uses the signals from the throttle

position sensor, air–flow meter and crankshaft position sensor

to monitor the engagement condition of the lock–up clutch.

Then the Engine and ECT ECU compares the engagement

condition of the lock–up clutch with the lock–up schedule in the

Engine and ECT ECU memory to detect the mechanical trouble

of the shift solenoid valve SL, the valve body and the torque

converter or automatic transaxle (clutch, brake or gear etc.).

Line

Pressure

Drain

F01116

DTC No.

P0770

DTCDetectingCondition

TroubleArea

S Lock–up does not occur when driving in the lock–up range

(normal driving at 80 km/h (50 mph)), or lock–up remains ON

in the lock–up OFF range.

S SL solenoid valve is stuck open or closed

S Valve body blocked up or stuck

S Lock–up clutch

(2–tripdetectionlogic)

S Automatic transaxle (clutch, brake or gear etc.)

S When lock–up is ON, clutch or brake slips or gear is broken.

INSPECTION PROCEDURE

1

Check SL solenoid valve operation.

PREPARATION:

(a) Remove the oil pan.

Air

(–)

(+)

(b) Remove the SL solenoid valve from the valve body.

CHECK:

(–)

(+)

(a) Applying 490 kPa (5 km/cm², 71 psi) of compressed air,

check that the solenoid valve opens.

(b) When battery positive voltage is supplied to the shift sole-

noid valve, check that it does no leak air.

OK:

D04318

(a) Solenoid valve opens.

(b) Solenoid valve does not leak air.

NG

Replace the SL solenoid valve.

OK

AVENSIS/CORONA SUP (RM781E)

DI–33

DIAGNOSTICS

–

AUTOMATIC TRANSAXLE(A246E)

2

Check valve body (See chapter 2 in the problem symptoms table).

NG

Repair or replace the valve body.

OK

3

Check torque converter (See page AX–33).

NG

Replace the torque converter.

OK

Repair the transaxle.

AVENSIS/CORONA SUP (RM781E)

DI–34

DIAGNOSTICS

–

AUTOMATIC TRANSAXLE(A246E)

DI1FY–06

DTC

P0773 Shift Solenoid E Electrical Malfunction

(SL Solenoid Valve)

CIRCUIT DESCRIPTION

The SL solenoid valve is turned ON and OFF by signals from the Engine and ECT ECU to control the hydrau-

lic pressure acting on the lock–up relay valve, then the signals control operation of the lock–up clutch.

Fail safe function

If the Engine and ECT ECU detects a malfunction, it turns the SL solenoid valve OFF.

DTC No.

DTCDetectingCondition

TroubleArea

Either (a) or (b) is detected for 1 time.

(2–tripdetectionlogic)

S Open or short on SL solenoid valve circuit

S SL solenoid valve

(a) Solenoid resistance is 8 Ω or less for short circuit when

solenoid is energized.

P0773

S Engine and ECT ECU

(b) Solenoid resistance is 100 kΩ or more for open circuit when

solenoid is not energized.

WIRING DIAGRAM

Engineand ECT ECU

Transaxle

SL Solenoid

Valve

2

E1

19

P

3

IE2

3

IF2

P

SL

E18

(RHD) (LHD)

D10181

AVENSIS/CORONA SUP (RM781E)

DI–35

DIAGNOSTICS

–

AUTOMATIC TRANSAXLE(A246E)

INSPECTION PROCEDURE

1

Measure resistance between terminal SL of Engine and ECT ECU and body

ground.

PREPARATION:

Disconnect the connector from Engine and ECT ECU.

CHECK:

Measure resistance between the terminal SL of Engine and

ECT ECU and the body ground.

OK:

Resistance: 11 – 15 Ω

SL

D07195

OK

Check and replace the Engine and ECT ECU

(See page IN–30).

NG

2

Check harness and connector between Engine and ECT ECU and automatic

transaxle solenoid connector.

PREPARATION:

Disconnect the solenoid connector from the transaxle.

CHECK:

Check the harness and connector between the terminal SL of

Engine and ECT ECU and the terminal 2 of solenoid connector.

OK:

There is no open or short circuit.

2

SL

D07196

NG

Repair or replace the harness or connector.

OK

AVENSIS/CORONA SUP (RM781E)

DI–36

DIAGNOSTICS

–

AUTOMATIC TRANSAXLE(A246E)

3

Check SL solenoid valve.

PREPARATION:

(a) Jack up the vehicle.

(b) Remove the oil pan.

(c) Disconnect the SL solenoid valve connector.

(d) Remove the SL solenoid valve.

CHECK:

(a) Measure resistance between the terminal SL of shift sole-

noid valve and the solenoid body.

(b) Connect positive (+) lead to the terminal of solenoid con-

nector, negative (–) lead to the solenoid body.

OK:

(+)

(a) Resistance: 11 – 15 Ω

(–)

(b) The SL solenoid valve makes operation noise.

Q08086

Q08087

D04319

NG

Replace the SL solenoid valve.

OK

Check and replace or repair the solenoid

wire.

AVENSIS/CORONA SUP (RM781E)

DI–37

DIAGNOSTICS

–

AUTOMATIC TRANSAXLE(A246E)

DI80B–01

DTC

P1520 Stop Light Switch Signal Malfunction

CIRCUIT DESCRIPTION

The purpose of this circuit is to prevent the engine from stalling, while driving in lock–up condition, when

brakes are suddenly applied.

When the brake pedal is operated, this switch sends a signals to Engine and ECT ECU. Then the Engine

and ECT ECU cancels operation of the lock–up clutch while braking is in progress.

DTC No.

P1520

DTCDetectingCondition

TroubleArea

No stop light switch signal to Engine and ECT ECU during

S Open or short in stop light switch circuit

S Stop light switch

driving.

(2–tripdetectionlogic)

S Engine and ECT ECU

WIRING DIAGRAM

Engine and

ECT ECU

Stop Light

Switch

Sedan:

Instrument Panel J/B

Center J/B

STOP

1

IA

6

10

IG

21

3F

8

3D

5

W–R *

W

G–W

5

G–W

STP

E20

6

W *

2

1

8 3C

G–W

1

F17

6

FL

G–W

ID1 II1

Block

ALT

5

6

*

*1

*2

*1

F

1 F15

J/C

W

D

*2

High

G–W

Mounted

Stop

Light

FL

MAIN

G–W

1

2

6

4

Stop

Light RH

W–B W–B

Stop Light

LH

4

*1: J12 (LHD), J28 (RHD)

*2: J13 (LHD), J29 (RHD)

*3: J10 (LHD), J30 (RHD)

*4: J11 (LHD), J31 (RHD)

*5: LHD

A

J/C

A

*4

Battery

W–B

A

*3

W–B

*6: RHD

W–B

5

BM

BL *

6

BN *

F13602

AVENSIS/CORONA SUP (RM781E)

DI–38

DIAGNOSTICS

–

AUTOMATIC TRANSAXLE(A246E)

Lift Back (LHD):

Instrument Panel J/B

Engine and

ECT ECU

Stop Light

Switch

Center J/B

STOP

6

E20

21

3F

8

3D

1

10

IG

W

G–W

W–R

STP

IA

2

1

8 3C

1 F17

6

ID1

FL

Block

G–W

ALT

D J14 D J14

1

BD1

1

F15

J/C

W

F J15 F J15

G–W

3

G–W High

FL

MAIN

Mounted

G–W

1

5

3

Stop

Stop Light

LH

W–B

Light

Light RH

2

5

W–B

E

B

J15

J/C

W–B

Battery

E J14

W–B

E J14 B J14

W–B

BO

BP

BQ

Lift Back (RHD):

Engine and

ECT ECU

Stop Light

Switch

Center J/B

Instrument Panel J/B

STOP

6

E20

21

3F

8

1

IA

10

IG

G–W

W

STP

3D

2

1

W

8 3C

1

F17

ALT

F15

5

II1

G–W

FL

Block

E J33 D J32

J/C

1

BD1

E J33 E J33

G–W

W

G–W

High

G–W

FL

MAIN

Mounted

Stop

1

2

3

5

Stop

Light LH

Stop Light

RH

Light

5

3

Battery

W–B

BQ

BP

BO

F13603

AVENSIS/CORONA SUP (RM781E)

DI–39

DIAGNOSTICS

–

AUTOMATIC TRANSAXLE(A246E)

Wagon:

Engine and

ECT ECU

Stop Light

Switch

Instrument Panel J/B

STOP

Center J/B

6

E20

21

3F

8

1

10

IG

1

W–R *

G–W

5

STP

IA

3D

2

W *

2

1

8 3C

G–W

1

F17

ALT

F15

1

6

J16 *

J34 *

FL

Block

G–W

2

ID1 II1

1

2

*

B

1

2

J17 *

J35 *

1

W

C

G–W

Stop

High

G–W

1

G–W

FL

MAIN

Mounted

Stop

2

Stop Light

RH

Light

Light LH

2

A

4

A

4

A

*1: LHD

*2: RHD

W–B

1

2

J17 *

J35 *

Battery

Junction Connector

A

W–B

BR

BS

F13604

AVENSIS/CORONA SUP (RM781E)

DI–40

DIAGNOSTICS

–

AUTOMATIC TRANSAXLE(A246E)

INSPECTION PROCEDURE

HINT:

Read freeze frame data using hand–held tester. Because freeze frame records the engine conditions when

the malfunction is detected, when troubleshooting it is useful for determining whether the vehicle was run-

ning or stopped, the engine warmed up or not, the air–fuel ratio lean or rich, etc. at the time of the malfunction.

1

Check operation of stop light.

PREPARATION:

Check if the stop lights go on and off normally when the brake pedal is operated and released.

NG

Check and repair stop light circuit

(See Pub. No. RM599E BE section).

OK

2

Check STP signal.

When using hand–held tester:

PREPARATION:

ON

(a) Connect the hand–held tester to the DLC3.

(b) Turn the ignition switch ON and hand–held tester main

switch ON.

Brake Pedal

Depressed

Brake Pedal

Released

CHECK:

Read the STP signal on the hand–held tester.

OK:

Brake pedal is depressed: STP ... ON

Brake pedal is released:

STP ... OFF

When not using hand–held tester:

PREPARATION:

STP

Turn the ignition switch ON.

CHECK:

Check voltage between terminal STP of Engine and ECT ECU

and body ground.

(–)

(+)

OK:

Brakepedal

Depressed

Released

Voltage

7.5 – 14 V

Below 1.5 V

D08714

OK

Check for intermittent problems (See page

DI–18).

NG

AVENSIS/CORONA SUP (RM781E)

DI–41

DIAGNOSTICS

–

AUTOMATIC TRANSAXLE(A246E)

3

Check harness and connector between Engine and ECT ECU and stop light

switch (See page IN–30).

NG

Repair or replace harness or connector.

OK

Check and replace Engine and ECT ECU (See

page IN–30).

AVENSIS/CORONA SUP (RM781E)

DI–42

DIAGNOSTICS

–

AUTOMATIC TRANSAXLE(A246E)

DI61W–05

DTC

P1760 Linear Solenoid for Line Pressure Control

Circuit malfunction (SLT Solenoid Valve)

CIRCUIT DESCRIPTION

The throttle pressure that is applied to the primary regulator

valve (which modulates line pressure) causes the SLT solenoid

valve, under electronic control, to precisely and minutely modu-

lates and generates line pressure according to the accelerator

pedal effort, or engine power output detected.

Line Pressure Con-

trol Pressure

This reduces the function of line pressure and provides smooth

shifting characteristics.

Upon receiving the throttle valve opening angle signal, Engine

and ECT ECU controls the line pressure by sending a predeter-

mined (*) duty ratio to the solenoid valve, modulating the line

pressure, generating throttle pressure.

Current Flow to Solenoid _D02635

(*) Duty Ratio

ON

The duty ratio is the ratio of the period of continuity in one cycle.

For example, if A is the period of continuity in one cycle, and B

is the period of non–continuity, then

OFF

1 cycle

A

A + B

Duty Ratio =

x 100 (%)

BE4056

DTC No.

P1760

DTCDetectingCondition

TroubleArea

(a) or (b) condition below is detected for 1 second or more.

S Open or short in SLT solenoid valve circuit

S SLT solenoid valve

–

(a) SLT terminal:0V

–

(b) SLT terminal:12V

S Engine and ECT ECU

HINT:

Refer to the chart for the wave form between terminals SLT⁺

and SLT^–during engine idling.

5 V / Div.

GND

1 msec. / Div.

D01875

AVENSIS/CORONA SUP (RM781E)

DI–43

DIAGNOSTICS

–

AUTOMATIC TRANSAXLE(A246E)

WIRING DIAGRAM

Engine and ECT ECU

Transaxle

1

E1

2

6

LG–B

P–B

+

E18 SLT

IE2 IF2

(RHD) (LHD)

SLT

Solenoid

Valve

4

E1

1

5

P–B

–

IE2 IF2

SLT

E18

(RHD)(LHD)

D10182

AVENSIS/CORONA SUP (RM781E)

DI–44

DIAGNOSTICS

–

AUTOMATIC TRANSAXLE(A246E)

INSPECTION PROCEDURE

1

Check SLT solenoid valve.

PREPARATION:

(a) Jack up the vehicle.

2

1

(b) Remove the oil pan.

(c) Disconnect the solenoid connector.

Check solenoid resistance:

CHECK:

Measure resistance between terminals 1 and 2 of solenoid con-

nector.

OK:

Resistance: 5.0 – 5.6 Ω at 20 °C (68°F)

Check solenoid operation:

CHECK:

Connect positive (+) lead with an 8 ∼ 10 W bulb to terminal 1 of

solenoid connector and negative (–) lead to terminal 2, then

check the movement of the valve.

OK:

1

(+)

(–)

2

Valvemovesin

direction

Whenbattery voltage is applied.

When battery voltage is cut off.

inthe illustration.

D01888

D01889

D01887

D02235

Valvemovesin

direction

inthe illustration.

NG

Replace SLT solenoid valve.

OK

2

Check harness and connector between SLT solenoid valve and Engine and ECT

ECU (See page IN–30).

NG

Repair or replace harness or connector.

OK

Check and replace Engine and ECT ECU (See

page IN–30).

AVENSIS/CORONA SUP (RM781E)

DI–45

DIAGNOSTICS

–

AUTOMATIC TRANSAXLE(A246E)

DI80C–01

DTC

P1780 Neutral Start Switch Malfunction

CIRCUIT DESCRIPTION

The neutral start switch detects the shift lever range and sends the signals to the Engine and ECT ECU.

The Engine and ECT ECU receives the signals (NSW, R, 2 and L) from the neutral start switch, when the

signal is not sent to the Engine and ECT ECU from the neutral start switch, the Engine and ECT ECU judges

that the shift lever is in the D range.

DTC No.

DTCDetectingCondition

TroubleArea

2 or more switches are ON simultaneously for ”N”, ”R”, ”2” or

”L” range.

(2–tripdetectionlogic)

When driving under the conditions (a), (b) and (c) for 30 se-

conds or more, the park/neutral position switch is ON (N posi-

tion).

S Short in neutral start switch circuit

S Neutral start switch

P1780

S Engine and ECT ECU

(2–tripdetectionlogic)

(a) Vehicle speed: 80 km/h (50 mph) or more

(b) Engine speed: 1,500 – 5,000 rpm

(c) Manifold absolute pressure: 300 mmHg or more

AVENSIS/CORONA SUP (RM781E)

DI–46

DIAGNOSTICS

–

AUTOMATIC TRANSAXLE(A246E)

WIRING DIAGRAM

Engine and ECT ECU

Neutral Start Switch

12

E20

8

Y–G

O

LL

L

2

3

E20

3

2L 4

RL 2

9

R–L

Center J/B

3

3C

3

3D

2

R–B

E20 R

Center J/B

7

3E

13

E20

20

3D

B–W

6

B–W

NSW

20 3E

W–B

B–W

Center J/B

Instrument Panel J/B

GAUGE

Ignition Switch

10

5

10

3A

R–L

B–Y

5

3C

IC

IF

8

AM1

IG1

Instrument Panel J/B

ST

1

ID

2

ID

6

4

R

W–R

4

IC

IE

B–W

2A

3

ST2 AM2

Engine Room J/B

W–R

W

3

MAIN

1

AM2

6

2A

6

2C

2

1

2

3

1

2D

5

A

Starter Relay

To Starter

1

2H

Instrument Panel J/B

AM1

*1

*2

1

2

W

J9 J20

Junction

2 *

1 *

FL Block

ALT

1

F15

2

3

W

1

Connector

2

IA

IC

F17

1

IJ *

FL MAIN

2

Battery

II *

*1: LHD

*2: RHD

D10185

AVENSIS/CORONA SUP (RM781E)

DI–47

DIAGNOSTICS

–

AUTOMATIC TRANSAXLE(A246E)

INSPECTION PROCEDURE

1

Read NSW, REVERSE, 2ND and LOW signals.

When using hand–held tester:

PREPARATION:

(a) Connect the hand–held tester to the DLC3.

(b) Turn the ignition switch ON.

CHECK:

Shift the shift lever to the P, R, N, 2 and L ranges, and read the

NSW, REVERSE, 2ND and LOW signals on the hand–held tes-

ter.

OK:

Shiftrange

Signal

P, N

R

NSW OFF → ON

REVERSE OFF → ON

2ND OFF → ON

LOW OFF → ON

2

L

When not using hand–held tester:

PREPARATION:

Turn the ignition switch ON.

CHECK:

ON

R

2

Measure voltage between the terminals NSW, R, 2 and L of En-

gine and ECT ECU and the body ground when the shift lever

is shifted to the following ranges.

NSW

(+)

L

(–)

OK:

D07198

NSW–Body R–Body

2–Body

ground

L–Body

ground

Range

ground

P, N

R

0 V

7.5 – 14 V* 7.5 – 14 V*

D

7.5 – 14 V

0 V

2

7.5 – 14 V

0 V

L

7.5 – 14 V

*: The voltage will drop slightly due to lighting up of the back up

light.

OK

Check and replace Engine and ECT ECU (See

page IN–30).

NG

AVENSIS/CORONA SUP (RM781E)

DI–48

DIAGNOSTICS

–

AUTOMATIC TRANSAXLE(A246E)

2

Check neutral start switch.

PREPARATION:

(a) Jack up the vehicle.

(b) Remove the neutral start switch.

CHECK:

Check continuity between each terminal shown below when the

shift lever is moved to each range.

5 4 3 2 1

8 7

9

6

ShiftRange

Terminal No. to continuity

P

R

N

2

–

6 – 9

D06561

2 – 3

–

6 – 9

–

3 – 4

3 – 8

L

–

OK:

There is continuity.

NG

Replace the neutral start switch.

OK

Repair or replace harness and connector between battery and neutral start switch, neutral start

switch and Engine and ECT ECU (See page IN–30).

AVENSIS/CORONA SUP (RM781E)

DI–49

DIAGNOSTICS

–

AUTOMATIC TRANSAXLE(A246E)

DI80D–01

O/D Main Switch & O/D OFF Indicator Light Circuit

CIRCUIT INSPECTION

The O/D main switch contacts go open when the switch is pushed in and go closed when it is pushed once

again. In O/D main switch OFF position, the O/D OFF indicator light lights up, and the Engine and ECT ECU

prohibits shifting to O/D.

WIRING DIAGRAM

O/D OFF Indicator Light

(Combination Meter)

Engine and ECT ECU

19

9

8

L

C11

E20

OD2

B–O

L

Center J/B

O/D Main Switch

10

3F

10

3A

2

4

R–L

W–B

Center J/B

Instrument Panel J/B

13

5

IC

13

3A

GAUGE

10

IF

3C

B–Y

W–B

Ignition Switch

8

5

AM1

IG1

Instrument

Panel

J/B

4

1

IE

IC

W

Instrument Panel J/B

AM1

2

3

IC

2

1

IA

W–B

W

FL

Block

1

2

2 *

1 *

FL

MAIN

1

ALT

W

A

J1 (LHD)

J27 (RHD)

F17

F15

Junction Connector

*1: LHD

*2: RHD

Battery

II (LHD)

IJ (RHD)

D10177

AVENSIS/CORONA SUP (RM781E)

DI–50

DIAGNOSTICS

–

AUTOMATIC TRANSAXLE(A246E)

INSPECTION PROCEDURE

O/D OFF indicator light does not light up

1

Check O/D main switch.

PREPARATION:

Disconnect the O/D main switch connector.

CHECK:

Check continuity between the terminals 2 and 4 of the O/D main

switch connector.

OK:

O/D main switch

Specifiedcondition

No continuity

Continuity

ON

Q08078

OFF

NG

Replace the O/D main switch.

OK

2

Check and replace the combination meter (See page BE–1).

NG

Replace the combination meter.

OK

AVENSIS/CORONA SUP (RM781E)

DI–51

DIAGNOSTICS

–

AUTOMATIC TRANSAXLE(A246E)

3

Check OVERDRIVE CUT SW2 signal.

When using hand–held tester:

PREPARATION:

(a) Connect a hand–held tester to the DLC3.

(b) Turn the ignition switch ON and the hand–held tester

main switch ON.

CHECK:

Read the OVERDRIVE CUT SW2 signal on the hand–held tes-

ter.

OK:

O/D main switch condition

O/D ON (Pushed in)

OVERDRIVE CUT SW2 signal

OFF

ON

O/D OFF (Pushed once again)

When not using hand–held tester:

PREPARATION:

ON

Turn the ignition switch ON.

CHECK:

Check voltage between the terminal OD2 of Engine and ECT

ECU and the body ground.

OK:

OD2

(–)

(+)

O/D main switch

Voltage

Below 3 V

9 – 14

D07199

ON

OFF

OK

Check and replace the Engine and ECT ECU

(See page IN–30).

NG

AVENSIS/CORONA SUP (RM781E)

DI–52

DIAGNOSTICS

–

AUTOMATIC TRANSAXLE(A246E)

4

Check harness and connector between O/D OFF indicator light and Engine and

ECT ECU (See page IN–30).

PREPARATION:

Disconnect the connector (E6) of Engine and ECT ECU and the

connector (C14) of the combination meter.

CHECK:

Measure the continuity between the connector (E6) of Engine

and ECT ECU and the connector (C14) of the combination me-

ter.

OK:

Continuity

NG

Repair or replace the harness or connector.

OK

Repair or replace the wire harness or con-

nectors between the connector of Engine

and ECT ECU and the body ground.

AVENSIS/CORONA SUP (RM781E)

DI–53

DIAGNOSTICS

–

AUTOMATIC TRANSAXLE(A246E)

O/D OFF indicator light remains ON

1

Check O/D main switch.

PREPARATION:

Disconnect the O/D main switch connector.

CHECK:

Check continuity between the terminals 2 and 4 of O/D main

switch connector.

OK:

O/D main switch

Resistance

No continuity

Continuity

ON

Q08078

OFF

NG

Repair the O/D main switch.

OK

2

Check harness and connector between O/D OFF indicator light and O/D main

switch, O/D OFF indicator light and Engine and ECT ECU (See page IN–30).

NG

Repair or replace the harness or connector.

OK

Check and replace the Engine and ECT ECU

(See page IN–30).

AVENSIS/CORONA SUP (RM781E)

DI–54

DIAGNOSTICS

–

AUTOMATIC TRANSAXLE(A246E)

DI336–03

Pattern Select Switch Circuit

CIRCUIT DESCRIPTION

The Engine & ECT ECU memory contains the shift programs for the NORMAL, POWER and SNOW (w/

SNOW mode) patterns, 2 range, L range and the lock–up patterns. By following the programs corresponding

to the signals from the pattern select switch, the neutral start switch and other various sensors, the Engine

& ECT ECT switches the solenoid valves ON and OFF, and controls the transaxle gear change and the lock–

up clutch operation.

WIRING DIAGRAM

Pattern Select Switch

NORM

Engine and ECT ECU

16

5

3

P–B

SNWI

E5

E20

SNOW

PWR

Center J/B

2

28

15

3D

15

3B

P

E5

PWR

E20

R–L

15 3F

Combination Meter

ECT SNOW

P

7

9

C11

22

C10

R–Y

B–O

E21 SNWO

3F 10

3F 1

10 3B

22

C11

Center

J/B

14

C10

24

W–B

C10

10 3A

ECT PWR

1

C10

R–L

Instrument Panel J/B

Ignition Switch

W–B

GAUGE

5

10

IF

B–Y

5

8

IC

IG1

AM1

1

J1 *

A

2

W

J27 *

Junction

Connector

FL

Block

Instrument Panel J/B

1

2 *

II *

FL

MAIN

2

Battery

2

AM1

3

2

1 *

IJ *

1

F15

ALT

W

2

1

IC

IA

F17

*1: LHD

*2: RHD

D10184

AVENSIS/CORONA SUP (RM781E)

DI–55

DIAGNOSTICS

–

AUTOMATIC TRANSAXLE(A246E)

INSPECTION PROCEDURE

1

Check PATTERN SEL SW signal.

When using hand–held tester:

PREPARATION:

(a) Remove the DLC3 cover.

(b) Connect a hand–held tester to the DLC3.

(c) Turn the ignition switch ON and hand–held tester main

switch ON.

CHECK:

Read the PATTERN SEL SW signal on the hand–held tester.

OK:

Pattern select switch

POWER

PATTERN SEL SW signal

ON

OFF

NORM

SNOW

When not using hand–held tester:

PREPARATION:

Turn the ignition switch ON.

CHECK:

ON

PWR

SNWI

Measure voltage between terminal each of PWR, SNWI of En-

gine & ECT ECU and body ground when the pattern select

switch is set to the PWR (POWER), NORM (NORMAL) or

SNOW (SNOW) position.

OK:

D10187

Switchposition

PWR

Testerconnection

PWR – Body ground

SNWI – Body ground

PWR – Body ground

SNWI – Body ground

PWR – Body ground

SNWI – Body ground

Specifiedcondition

9 – 14 V

Below 1.5 V

9 – 14 V

NORM

SNOW

HINT:

The Engine & ECT ECU uses the normal pattern signal if the

PWR and SNWI signals are not input.

OK

Proceed to next circuit inspection shown in

symptom problems table (See page DI–18).

NG

AVENSIS/CORONA SUP (RM781E)

DI–56

DIAGNOSTICS

–

AUTOMATIC TRANSAXLE(A246E)

2

Check pattern select switch

PREPARATION:

Disconnect the pattern select switch connector.

CHECK:

2

Check continuity between terminals 2 and 3 (PWR, NORM), 3

and 5 (SNOW) of pattern select switch connector when the se-

lect switch is set to PWR, NORM or SNOW position.

OK:

3

5

Switchposition

PWR

Testerconnection

2 – 3

Specifiedcondition

Continuity

D10186

NORM

2 – 3, 3 – 5

3 – 5

No continuity

Continuity

SNOW

NG

Replace the pattern select switch.

OK

3

Check harness and connector between battery and pattern select switch, pattern

select switch and Engine & ECT ECU (See page IN–30).

NG

Repair or replace the harness or connector.

OK

Check and replace the Engine & ECT ECU

(See page IN–30).

AVENSIS/CORONA SUP (RM781E)

DI–57

DIAGNOSTICS

–

AUTOMATIC TRANSAXLE(A246E)

DI80E–01

Kick–down Switch Circuit (LHD)

CIRCUIT DESCRIPTION

The kick–down switch is turned ON when the accelerator pedal is depressed beyond the full throttle opening

and sends signals to Engine and ECT ECU.

When the kick–down switch is turned ON, the Engine and ECT ECU controls gear shifting according to the

programmed shift diagrams.

If a short circuit develops in the kick–down switch, the Engine and ECT ECU disregards the kick–down sig-

nals and controls shifting at the normal shift points.

WIRING DIAGRAM

Engine and ECT ECU

Kick–down

Switch

4

Y

1

2

E20

KD

W–B

Center J/B

22

3F

9

3F

Instrument Panel J/B

W–B

1

13

3A

4

3F

W–B

IC

IE

A

J1 (LHD)

J27 (RHD)

Junction

Connector

II (LHD)

IJ (RHD)

D10183

AVENSIS/CORONA SUP (RM781E)

DI–58

DIAGNOSTICS

–

AUTOMATIC TRANSAXLE(A246E)

INSPECTION PROCEDURE

1

Check KICK DOWN SW signal.

When using hand–held tester:

PREPARATION:

(a) Remove the DLC3 cover.

(b) Connect a hand–held tester to the DLC3.

(c) Turn the ignition switch ON and hand–held tester main

switch ON.

CHECK:

Read the KICK DOWN SW signal on the hand–held tester.

OK:

KICK DOWN

AcceleratorPedal

SW signal

Fully depressed (kick–down SW is ON)

Released (kick–down SW is OFF)

When not using hand–held tester:

PREPARATION:

ON

OFF

KD

ON

Turn the ignition switch ON.

CHECK:

Measure voltage between terminal KD of Engine and ECT ECU

connector and body ground when accelerator pedal is fully de-

pressed or not.

OK:

(–)

(+)

D07200

AcceleratorPedal

Fully depressed (kick–down SW is on)

Released (kick–down SW is OFF)

Voltage

Below 1 V

10 – 14 V

OK

Proceed to next circuit inspection shown in

problem symptoms table (See page DI–18).

NG

AVENSIS/CORONA SUP (RM781E)

DI–59

DIAGNOSTICS

–

AUTOMATIC TRANSAXLE(A246E)

2

Check kick–down switch.

PREPARATION:

Disconnect the kick–down switch connector.

CHECK:

1

Check continuity at each terminal of kick–down switch connec-

tor.

OK:

2

Kick–down Switch

Specifiedcontinuity

Continuity

ON

D01519

OFF

No continuity

NG

Replace kick–down switch

OK

3

Check harness and connector between Engine & ECT ECU and kick–down

switch, kick–down switch and body ground (See page IN–30).

NG

Repair or replace the harness or connector.

OK

Check and replace Engine & ECT ECU (See

page IN–30).

AVENSIS/CORONA SUP (RM781E)

DIAGNOSTICS -> Automatic Transaxle (A246E) for Your Toyota Avensis 4 Door First Generation (1997-2003)

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