Get Motronic MED 9.1 Guide for Volkswagen Vento 4 Door First Generation (2010-2022)

Motronic MED 9.1

The advancements in fuel injection technology

that led to the FSI injection system required equal

advancements in electronic engine control systems.

The Bosch MED 9.1 was used ﬁrst with the 2.0L FSI

Turbo and then with the 3.6L VR-6 FSI engine.

Differences in the Motronic MED 9.1 from Motronic

ME 7 include:

• Fuel Pressure Sensor G247

• Low Fuel Pressure Sensor G410

• Engine Coolant Temperature (ECT) Sensor (on

Radiator) G83

29

Motronic MED 9.1

System Overview (3.2LVR6 FSI [>2007] 3.6LVR6 FSI Shown)

Sensors

Engine Speed (RPM) Sensor G28

Mass Air Flow (MAF) Sensor G70

Throttle Position (TP) Sensor G79

Accelerator Pedal Position Sensor 2 G185

Clutch Position Sensor G476

Throttle Valve Control Module J338 with

Throttle Drive Angle Sensor 1 (for Electronic

Power Control [EPC]) G187

Throttle Drive Angle Sensor 2 (for Electronic

Power Control [EPC]) G188

Engine Control

Module (ECM)

J623

Camshaft Position (CMP) Sensor G40

Camshaft Position (CMP) Sensor 2 G163

Engine CoolantTemperature (ECT) Sensor G62

Engine CoolantTemperature (ECT) Sensor (on Radiator) G83

Knock Sensor (KS) 1 G61

Knock Sensor (KS) 2 G66

Brake Light Switch F

Fuel Pressure Sensor G247

Low Fuel Pressure Sensor G410

CAN Data-bus

Oil LevelThermal Sensor G266

Heated Oxygen Sensor (HO2S) G39

Heated Oxygen Sensor (HO2S) 2 G108

Oxygen Sensor (O2S) BehindThree Way Catalytic

Converter (TWC) G130

Oxygen Sensor (O2S) 2 BehindThree Way Catalytic

Converter (TWC) G131

30

Motronic MED 9.1

Actuators

Fuel Pump (FP) Control Module J538

Transfer Fuel Pump (FP) G6

Cylinder 1-6 Fuel Injector

N30, N31, N32, N33, N83, N84

Ignition Coil 1-6 with Power Output Stage

N70, N127, N291, N292, N323, N324

Throttle Valve Control Module J338 withThrottle Drive (for

Electronic Power Control [EPC]) G186

Fuel Pressure Regulator Valve N276

Evaporative Emission (EVAP) Canister Purge Regulator Valve N80

Intake Manifold Runner Control (IMRC) Valve N316

Camshaft Adjustment Valve 1 N205

Camshaft Adjustment Valve 1 (exhaust) N318

Oxygen Sensor (O2S) Heater Z19

Oxygen Sensor (O2S) 2 Heater Z28

Instrument Cluster

Control Module J285

Oxygen Sensor (O2S) 1 (behindThree Way Catalytic Converter

(TWC)) Heater Z29

Oxygen Sensor (O2S) 2 (behindThree Way Catalytic Converter

(TWC)) Heater Z30

Coolant Fan Control (FC) Control Module J293

Coolant Fan V7

Coolant Fan 2 V177

Recirculation Pump Relay J160

Recirculation Pump V55

31

Motronic MED 9.1

Sensors

Fuel Pressure Sensor G247

The Fuel Pressure Sensor is located on the lower fuel

distributor pipe. It measures the fuel pressure in the

high-pressure fuel system.

Signal Utilization

The ECM analyzes the signal and regulates the fuel

high pressure through the Fuel Pressure Regulator

Valve N276 in the high-pressure pump.

Effects of Signal Failure

If the Fuel Pressure Sensor fails, the fuel pressure

regulator valve is activated at a ﬁxed value by the

ECM.

360_110

G247

Low Fuel Pressure Sensor G410

The Low Fuel Pressure Sensor is located on the high-

pressure fuel pump. It measures the fuel pressure in

the low-pressure fuel system.

Signal Utilization

The signal is used by the ECM to regulate the low

pressure fuel system. Based on the signal from the

sensor, a signal is sent by the ECM to the Fuel Pump

Control Module J538, which then regulatesTransfer

Fuel Pump G6 as needed.

Effects of Signal Failure

If the Low Fuel Pressure Sensor fails, the fuel

pressure is not regulated as needed. Fuel pressure is

maintained at a constant 72 psi (5 bar).

360_109

G410

32

Motronic MED 9.1

Engine CoolantTemperature (ECT)

Sensor G62

This sensor is located at the coolant distributor above

the oil ﬁlter on the engine and it informs the ECM

of the coolant temperature. Situated at the engine

outlet, G62 measures the highest temperature of the

coolant.

Signal Utilization

The coolant temperature is used by the ECM

for different engine functions. For example, the

computation for the injection amount, compressor

pressure, start of fuel delivery and the amount of

exhaust gas recirculation.

360_164

Effects of Signal Failure

G62

If the signal fails, the ECM uses the signal from the

ECT Sensor G83.

Radiator

Inlet

Engine CoolantTemperature (ECT)

Sensor (on the Radiator) G83

The ECT Sensor (on the Radiator) G83 is located in

the radiator output line and measures the coolant exit

temperature. This is the lowest coolant temperature

in the system.

Signal Utilization

The radiator fan is activated by comparing both

signals from the ECT Sensors G62 and G83.

Radiator

Outlet

Effects of Signal Failure

If the signal from the ECT Sensor G83 is lost, the ﬁrst

speed engine coolant fan is activated permanently.

G83

360_182

33

Motronic MED 9.1

Oil LevelThermal Sensor G266

The oil level thermal sensor is installed at the bottom

of the engine oil sump. When the ignition is turned

on, ﬁlling level and temperature data are gathered

continuously. The Instrument Cluster Control Module

J285 uses this signal to display the engine oil

temperature and as part of the calculation for the oil

change interval.

233_047

360_156

Oil Level Indicator

The conventional warning lamp for engine oil pressure

is also used as an oil level indicator.

• If the yellow LED is continuously on = oil level too

low

• If the yellow LED is ﬂashing = sender for oil level

defective

An excessively high oil level is not indicated.

233_049

34

Motronic MED 9.1

SignalWaveform and Evaluation

Oil Level

The measuring element is brieﬂy heated via the

present oil temperature (output = high) and then

cools down again (output = low).

The oil level is calculated from the amount of time it

takes for the sensor to cool down. The calculation is

accurate to approximately 0.08 in (2 mm).

This procedure is repeated continuously. The High

times are dependent on the oil temperature and the

Low times are proportional to the oil level.

The more oil there is in the oil sump, the quicker the

sensor cools down again.

• Long cool-down time = low oil level

• Short cool-down time = normal

Fill Level Sensor

Temperature Sensor

Temperature

Fill Level

233_050

OilTemperature

During the cool-down phase of the sensor, the oil temperature signal is also transmitted.

Heating

Phase

OilTemperature

Evaluation 25 – 85 ms

233_026

35

Motronic MED 9.1

Actuators

Camshaft AdjustmentValve 1 N205,

Camshaft AdjustmentValve 1

(Exhaust) N318

These solenoid valves are integrated in the camshaft

adjustment housing. They distribute the oil pressure

based on the ECM signals for the adjustment

direction and adjustment travel at the camshaft

adjusters.

Both camshafts are continuously adjustable:

• Intake camshaft at 52° of the crankshaft angle

• Exhaust camshaft at 42° of the crankshaft angle

• Maximum valve overlap angle 47°

The exhaust camshaft is mechanically locked when no

oil pressure is available (engine not running).

360_161

Effects of Signal Failure

N205

N318

If an electrical connection to the camshaft adjusters

is defective, or if a camshaft adjuster fails because it

is mechanically seized or as a result of inadequate oil

pressure, there is no camshaft adjustment.

36

Motronic MED 9.1

Transfer Fuel Pump (FP) G6 and the

Fuel Level Sensor G

TheTransfer Fuel Pump and the Fuel Filter are

combined in the FuelTransfer Unit. The FuelTransfer

Unit is located in the fuel tank.

Operation

TheTransfer Fuel Pump transfers the fuel in the low

pressure fuel system to the high-pressure fuel pump.

The ECM constantly monitors fuel pressure through

the Low Fuel Pressure Sensor G410. If the fuel

pressure is not adequate to meet current engine

demand, the ECM activates the FP Control Module

J538, which controls theTransfer FP G6 with a Pulse

Width Modulation (PWM) signal.

360_190

Effects of Failure

If theTransfer Fuel Pump fails, engine operation is not

possible.

Fuel Pressure RegulatorValve N276

The Fuel Pressure Regulator Valve is located on the

underside of the High-Pressure Fuel Pump.

The ECM regulates the fuel high-pressure through the

Fuel Pressure Regulator Valve at a level between 507

and 1,450 psi (35 and 100 bar).

Effects of Failure

The ECM goes into emergency running mode.

360_162

High-Pressure

Fuel Pump

N276

37

Motronic MED 9.1

Cylinders 1-6 Fuel Injectors N30,

N31, N32, N33, N83, N84

The High-Pressure Fuel Injectors are inserted into

the cylinder head. They are triggered by the ECM

according to ﬁring order. When triggered, they spray

fuel directly into the cylinder.

Due to the design of the engine, injection takes place

from one side. For this reason, the fuel injectors for

cylinder bank 1, 3, and 5 are longer than the fuel

injectors for cylinder bank 2, 4, and 6.

Operation

360_137

Peak and Hold Injectors are used in Volkswagen FSI

engines. The injector receives full current only long

enough to open the pintle (Peak), then pulses the

current to hold the injector open (Hold).

It has relatively low internal resistance compared

to a saturation injector. Additionally, it has a faster

response time that is required to inject fuel into the

combustion chamber at the correct moment for the

most efﬁcient combustion.

Fine-Mesh Strainer

Solenoid Cell

Effects of Failure

A defective fuel injector is recognized by misﬁre

detection and is no longer triggered.

Valve Needle with

Solenoid Armature

Teﬂon Sealing Ring

38

Motronic MED 9.1

Peak and Hold Injector Scope Pattern

3. The ECM controls the injector current to a target

value by modulating the voltage applied.

1. The capacitors needed to elevate battery voltage

to ~60 volts are charged.

Once it is opened, the injector needle can be held

in position with lower solenoid current.

2. Injector opens: ~60 volts for ~200 microseconds.

– It takes a lot of power to open the injector

4. Induced spike as ﬁeld collapses.

5. Total injector opening time.

39

Motronic MED 9.1

Intake Manifold Runner Control

(IMRC)Valve N316

The Intake Manifold Runner Control Valve N316 is

located on the variable intake manifold and is an

electro-pneumatic valve.

When it is activated, it operates the intake manifold

ﬂap to change the length of the intake manifold.

Effects of Failure

If the valve fails, the intake manifold ﬂaps are pulled

by a mechanical spring to an emergency running

position. This position corresponds to the power

setting of the intake manifold.

360_051

N316

40

Motronic MED 9.1 for Your Volkswagen Vento 4 Door First Generation (2010-2022)

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