b4_motronic_vr6_aaa_01.pdf

2.8 Liter VR6 2V Fuel Injection & Ignition, Engine Code(s): AAA

m.y. 1996-1997

01 - On Board Diagnostic (OBD)

On Board Diagnostic (OBD II)

Malfunction Indicator Lamp (MIL)

On Board Diagnostic (OBD II), technical data

VAG 1551 Scan Tool (ST), connecting and selecting "Engine

Electronics" address word 01

Code Control Module (function 07)

Check DTC Memory (function 02)

Diagnostic Trouble Code (DTC) table

Erase DTC Memory (function 05)

Readiness code, reading (function 15)

Readiness code, creating

Output Diagnostic Test Mode (DTM) (function 03)

Read Measuring Value Block (function 08)

Display group overview

VAG 1551 Scan Tool (ST), connecting and selecting

"CARB/OBD II" address word 33

Current data, mode 1

Freeze frame data, mode 2

DTC memory, mode 3

Clear DTC memory, mode 4

Oxygen sensor signal (B1-S1), mode 5

24 - Multiport Fuel Injection (MFI)

Multiport fuel injection and ignition system

Component locations, overview

General information

Engine Control Module (ECM), Heated Oxygen Sensor (HO2S),

Engine Coolant Temperature (ECT) sensor and engine speed

(RPM) sensor, removing and installing

Air cleaner (ACL), Mass Air Flow (MAF) sensor and Positive

Crankcase Ventilation (PCV) heating element, removing and

installing

Fuel rail and intake manifold, removing and installing

Throttle valve control module, removing and installing

Safety precautions

Rules for cleanliness

Technical data

Idle speed, checking

Heated Oxygen Sensor (HO2S) and Oxygen Sensor (O2S) control,

checking (before three way catalytic converter)

Oxygen Sensor (O2S) heating, checking (before three way catalytic

converter)

Heated Oxygen Sensor (HO2S) 2 and Oxygen Sensor (O2S)

control, checking (after three way catalytic converter)

Oxygen Sensor (O2S) heating, checking (after three way catalytic

converter)

Oxygen Sensor (O2S) aging, checking (before three way catalytic

converter)

Engine operation, checking

Mass Air Flow (MAF) sensor, checking

Throttle valve control module, checking

Basic Setting (function 04)

Engine Coolant Temperature (ECT) sensor, checking

Intake Air Temperature (IAT) sensor, checking

Engine speed (RPM) sensor, checking

Speedometer Vehicle Speed Sensor (VSS) signal, checking

Engine Control Module (ECM) voltage supply, checking

Signal from automatic transmission, checking

Signal from A/C compressor, checking

Fuel injectors, checking

Fuel pressure regulator and residual pressure, checking

Intake air system (outside air), checking for leaks

28 - Ignition/Glow plug system

Multiport fuel injection and ignition system

Ignition system, components

Safety precautions

Technical data, spark plugs

Ignition timing, checking

Misfire recognition, checking

Ignition timing control, checking

Camshaft Position (CMP) sensor, checking

Knock Sensor (KS) and knock control, checking

Ignition coil, checking

On Board Diagnostic (OBD II)

Page 1 of 6

01-1

On Board Diagnostic (OBD II)

Function

The Motronic Engine Control Module (ECM) -

J220- for the fuel injection and ignition system is

equipped with a Diagnostic Trouble Code (DTC)

memory.

If malfunctions occur in the sensors and

components being monitored, they will be stored

in the DTC memory together with an indication of

the type of malfunction.

The stored malfunctions are displayed after

initiating the malfunction display Page 01-12 .

After malfunctions have been eliminated, DTC

memory must be erased ( Page 01-29 ) and

the repair must be verified via the appropriate

display group Page 01-33 , Readiness code,

creating.

The readiness code must be created again after

every time the DTC memory is erased and when

the voltage supply to ECM -J220- is interrupted

Page 01-33 .

http://ebahn.bentleypublishers.com/vw/servlet/Display?action=Goto&type=repair&id=VW.B4.FU07.01.1

12/6/2004

On Board Diagnostic (OBD II)

Page 2 of 6

01-2

Malfunction Indicator Lamp (MIL)

If malfunctions are recognized and verified by the

engine control module, they will be indicated by

switching on the MIL.

Location of Malfunction Indicator Lamp (MIL).

Note:

The MIL can be switched on in the flashing or

permanently on mode. The Diagnostic Trouble Code

(DTC) memory must be checked in every case

Page 01-12 .

Flashing: There is a malfunction that can damage

the Three Way Catalytic Converter (TWC) if

driven in this condition. In this case, the vehicle

must not be driven using wide open throttle, but

with partial throttle only, during which the MIL is

continuously illuminated rather than flashing.

Permanently on: There is a malfunction which will

increase exhaust emissions. Check engine and/or

automatic transmission control modules.

If the MIL does not light up: If there is an engine

running problem, or a customer complaint of one,

perform a functional check of the MIL. Then DTC

memory must be checked because malfunctions

that do not switch on the MIL immediately can

also be stored.

http://ebahn.bentleypublishers.com/vw/servlet/Display?action=Goto&type=repair&id=VW.B4.FU07.01.1

12/6/2004

On Board Diagnostic (OBD II)

Page 3 of 6

01-3

Functional check:

- Switch ignition on.

The MIL must light-up.

If the MIL does not light with ignition switched

on:

- Check wiring to MIL as follows:

Cause:

Remedy:

Malfunction Indicator Lamp (MIL) -K83- is not

activated or does not light-up due to open

circuit

- Switch ignition off

- Connect VAG 1598/18 test box

- Bridge test box sockets 1 and 5

- Switch ignition on

MIL must light-up

If the MIL does not light-up:

- Switch ignition off

- Check MIL bulb

If bulb is OK:

- Locate and eliminate short or wiring open circuit

from Engine Control Module (ECM) to MIL using

wiring diagram

If no malfunction can be detected in the wiring to

MIL:

Malfunction cause:

ECM -J220- faulty

- Replace ECM, erase Diagnostic Trouble Code

(DTC) memory.

http://ebahn.bentleypublishers.com/vw/servlet/Display?action=Goto&type=repair&id=VW.B4.FU07.01.1

12/6/2004

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