Volkswagen Golf / Golf GTI / Jetta. Manual — part 185

24-8

Repair

Manual, 2.8
Liter VR6 4V
Engine
Mechanical,
Engine Code
(s): BDF;
Repair Group
26

26 - Throttle

Valve
Control
Module
-J338-

Heated

by
coolant

27 - Combi-

valve

Secondary

air
system:

28 - Ignition

coils
with
power
output
stage (-
N70-, -
N127-, -
N291-, -
N292-, -
N323-
and -
N324-)

Page
28-3

,

item 2

Fuel injection system, servicing

24-9

Note:

Fig. 1

Relay assignment in
protective housing (on
left in engine
compartment)

1 - Secondary Air Injection (AIR)
Pump Relay -J299-

2 - Motronic Engine Control Module
(ECM) Power Supply Relay -J271-

If tools are necessary to pull

relays or control modules out of
the relay plate, first disconnect
battery Ground (GND) strap.

Before disconnecting battery

Ground (GND) strap obtain code
for radios with anti-theft coding.

Fuel injection system, servicing

24-10

Fuel injection system, general notes

Servicing ignition parts:

Repair Manual, 2.8 Liter VR6 4V Engine

Mechanical, Engine Code(s): BDF; Repair Group
28

Note:

The Motronic Engine Control Module (ECM) -

J220- is equipped with On Board Diagnostic
(OBD). Before carrying out repairs and
troubleshooting the DTC memory must be
checked. Also the vacuum hoses and
connections must be checked (unmetered air).

Fuel hoses in engine compartment must only

be secured with spring-type clips. The use of
clamp or screw-type clips is not permitted.

Components marked with * are checked via On

Board Diagnostic (OBD)

Page 01-23

.

Components marked with **can be checked via

Output Diagnosis Test Mode (DTM)

Page

01-100

.

Do not use sealing compounds containing

silicone. Particles of silicone drawn into the
engine, will not be burned in the engine and
may damage the Oxygen Sensor(s) (O2S).

For trouble-free operation of the electrical

components, a voltage of at least 11.5 V is
necessary.

Disconnecting and connecting the battery must

only be done with the ignition switched off,
otherwise the Motronic Engine Control Module
(ECM) -J220- could be damaged.

Fuel injection system, servicing

24-11

Check DTC memory before carrying out repairs

and when troubleshooting

Page 01-23

,

Checking and erasing DTC memory

During some checks it is possible that the

control module will detect and store a
Diagnostic Trouble Code (DTC). Therefore,
after completing all checks and repairs the DTC
memory must be checked and if necessary,
erased

Page 01-23

, Check and erasing DTC

memory and then generate the readiness code

Page 01-149

.

If the engine starts, runs for a short period and

then stops, after troubleshooting, repairs or
component tests, then the Diagnostic Trouble
Code (DTC) may lie with the Immobilizer which
is blocking the Motronic Engine Control Module
(ECM) -J220-. In such cases the DTC memory
must be checked and, if necessary, the control
module adapted.

Repair Manual, Electrical Equipment On

Board Diagnostic (OBD);Repair Group 01

Safety precautions

Page 24-33

.

Rules for cleanliness

Page 24-36

.

Page 24-37

.

Checking engine operating condition

Page 24-

158

.

Fuel injection system, servicing