Get Ignition System -> Diagnosis Guide for Suzuki Alto 4 Door Fifth Generation (1998-2003)

6F-4 IGNITION SYSTEM

DIAGNOSIS

Condition

Possible Cause Correction

Engine cranks, but will

not start or hard to start

D Blown fuse for ignition coil

D Loose connection or disconnection of lead wire or

high-tension cord(s)

D Faulty high-tension cord(s)

D Faulty spark plug(s)

D Cracked rotor or cap

D Maladjusted signal rotor air gap

D Faulty ignition coil

D Faulty noise suppressor

D Faulty CMP sensor

D Faulty igniter

D Faulty ECM

D Maladjusted ignition timing

Replace

Connect securely

Replace

Adjust, clean or replace

Replace

Adjust

Replace

Adjust

Poor fuel economy or

engine performance

D Incorrect ignition timing

D Faulty spark plug(s) or high-tension cord(s)

D Faulty ECM

Adjust

Adjust, clean or replace

Replace

DIAGNOSTIC FLOW TABLE

STEP

ACTION YES NO

1 Was ENGINE DIAGNOSTIC FLOW TABLE in SEC-

TION 6 performed?

Go to Step 2. Go to ENGINE DIAG-

NOSTIC FLOW

TABLE in SECTION 6.

2 Ignition Spark Test

1) Check all spark plug for condition and type, refer-

ring to SPARK PLUG in this section.

2) If OK, perform ignition spark test, referring to IGNI-

TION SPARK TEST in this section.

Is spark emitted from all spark plugs?

Go to Step 11 on the

next page.

Go to Step 3.

3 Diagnostic Trouble Code (DTC) Check

1) Check DTC stored in ECM, referring to DIAGNOS-

TIC TROUBLE CODE (DTC) CHECK in SECTION

6E1.

Is DTC stored?

Go to applicable flow

table corresponding to

that code No. in SEC-

TION 6E1.

Go to Step 4.

4 Electrical Connection Check/Noise Suppressor Check

1) Check ignition coil for electrical connection.

2) Check noise suppressor referring to NOISE SUP-

PRESSOR.

Are they in good condition?

Go to Step 5. Connect securely.

Replace noise sup-

pressor.

5 High-tension Cord Check

1) Check high-tension cord for resistance, referring to

HIGH-TENSION CORDS in this section.

Is check result satisfactory?

Go to Step 6. Replace high-tension

cord(s).

6 Igniter Check

1) Check igniter, referring to IGNITER in this section.

Is check result satisfactory?

Go to Step 7. Replace igniter.

IGNITION SYSTEM 6F-5

STEP ACTION YES NO

7 Ignition Coil Power Supply And Ground Circuit Check

1) Check ignition coil power supply (“B/W” wire) circuit

for open and short.

Are circuits in good condition?

Go to Step 8. Repair or replace.

8 Ignition Coil Check

1) Check ignition coil for resistance, referring to IGNI-

TION COIL in this section.

Is check result satisfactory?

Go to Step 9. Replace ignition coil

assembly.

9 CMP Sensor Check

1) Check CMP sensor and signal rotor, referring to

DISTRIBUTOR in this section.

Is check result satisfactory?

Go to Step 10 on the

next page.

Adjust or replace.

10 Ignition Trigger Signal Circuit Check

1) Check ignition trigger signal (“Br/W” wire) circuit for

open, short and poor connection.

Are circuits in good condition?

Go to Step 11. Repair or replace.

11 Ignition Timing Check

1) Check initial ignition timing and ignition timing ad-

vance, referring to IGNITION TIMING in this sec-

tion.

Is check result satisfactory?

Substitute a known-

good ECM and then

repeat STEP 2.

Go to Step 12.

12 Ignition Timing Adjustment And Recheck

1) Adjust initial ignition timing, referring to IGNITION

TIMING in this section.

2) Recheck initial ignition timing and ignition timing

advance, referring to IGNITION TIMING in this sec-

tion.

Is check result satisfactory?

System is in good

condition.

Substitute a known-

good ECM and then

repeat STEP 2.

IGNITION SPARK TEST

1) Disconnect injector couplers (1) from injectors.

WARNING:

Without disconnection of injector coupler, combus-

tible gas may come out from spark plug holes during

this test and may get ignited in engine room.

2) Remove spark plugs and connect them to high-tension cords,

and then ground spark plugs.

3) Crank engine and check if each spark plug sparks.

4) If no spark is emitted, inspect high-tension cords, spark plugs,

ignition coil, distributor, etc.

ON-VEHICLE SERVICE

HIGH-TENSION CORDS

REMOVAL

1) Remove high-tension cord at ignition coil while gripping its cap.

2) Remove distributor cap (1) installed with high-tension cords.

3) Remove high-tension cord clamp from cylinder head cover.

4) Pull out high-tension cords from spark plugs while gripping each

cap.

CAUTION:

D Removal of high-tension cords together with

clamps will be recommended so as not to damage

their inside wire (resistive conductor).

D For the same reason, pull out each connection by

gripping cap portion.

5) Measure resistance of high-tension cord by using ohmmeter.

High-tension cord resistance:

10 – 22 kW/m (3.0 – 6.7 kW/ft) Z–16 marked. . .

4 – 10 kW/m (1.3 – 3.3 kW/ft) Z– 7 marked. . .

1. Marking on cord (Z–7E or Z–16)

6F-6 IGNITION SYSTEM

Ignition System -> Diagnosis for Your Suzuki Alto 4 Door Fifth Generation (1998-2003)

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