Volkswagen Golf / Golf GTI / Jetta. Manual — part 252

28-28

If the LED does not flicker:

- Check wiring

Page 28-28

.

Checking wiring

- Remove wiper arms and cowl

panel:

Repair Manual, Electrical

Equipment; Repair Group 92

- Connect VAG 1598/31 test box to

control module wiring harness.
Engine Control Module (ECM)
remains disconnected.

- Check wiring for open circuit

between test box and 4-pin
connector referring to Electrical
Wiring Diagrams. For:

Cylinder 1 terminal 4 and socket

102

Cylinder 2 terminal 4 and socket

110

Cylinder 3 terminal 4 and socket

94

Cylinder 4 terminal 4 and socket

111

Cylinder 5 terminal 4 and socket

103

Cylinder 6 terminal 4 and socket

95

Wire resistance: max. 1.5

Ignition system, servicing

28-29

- Additionally check wires for short to one

another.

Specification:

If no malfunction can be found in the wiring:

- Replace Engine Control Module (ECM)

Page

24-173

.

- Check DTC memory, repair malfunctions if

necessary and then erase DTC memory

Page

01-23

.

- Erase learned values and adapt Engine Control

Module (ECM) again

Page 24-182

.

- Read readiness code

Page 01-146

. If DTC

memory has been erased or Engine Control
Module (ECM) was disconnected from battery
positive, readiness code must be generated
again

Page 01-149

.

Ignition system, servicing

28-30

Knock sensor, checking

Note:

The terminal surfaces between knock sensor

and cylinder block must be free of corrosion,
dirt and grease.

Knock Sensor (KS) 2 -G66- has a direct 2-pin

connector and therefore no terminal for the
shielding in the connector.

It is extremely important to keep to the torque

setting of 20 Nm to ensure the nock sensors
perform perfectly.

Only gold-plated terminals may be used when

servicing the knock sensor connector terminals.

Ignition system, servicing

28-31

Special tools, materials and
equipment

Note:

All functions which could previously
be performed with VAG 1551/1552
can also be performed with the VAS
5051.

VAG 1551 Scan tool (or VAG

1552 Scan tool) with VAG 1551/3
adapter cable

VAG 1526 or Fluke 83 Hand

multimeter or VAG 1715
multimeter

VAG 1594 adapter set

VAG 1598/31 test box

Electrical Wiring Diagrams

Ignition system, servicing