Volkswagen Golf / Golf GTI / Jetta. Manual — part 253

28-32

Test requirements

The fuses must be OK.

The battery voltage must be at

least 11.5 V.

All electrical accessories, e.g.

lights and rear window defroster
must be switched off.

If the vehicle is equipped with air

conditioning, it must be turned
off.

Selector lever must be in

position "P" or "N" on vehicles
with an automatic transmission.

Knock sensor malfunction

detected by On Board
Diagnostic (OBD)

Page 01-

23

.

The signal from brake light

switch and brake pedal switch
must be OK, Checking

Page

24-206

.

Engine Coolant Temperature

(ECT) must be at least 85 C,

display group 28, display zone

3.

Ignition system, servicing

28-33

Functional check

- Connect VAG 1551 Scan tool ((VAG 1552) and

select engine electronics control module with
"Address word" 01. Engine must be running at
idling speed: (Connecting scan tool and
selecting engine electronics control module

Page 01-12

).

Rapid data transfer

HELP

Select function XX

Indicated on display:

- Press buttons -0- and -4- for function "Initiate

basic setting" and confirm entry with -Q- button.

Basic setting

Input display group number XXX

Indicated on display:

- Press buttons -0-, -2- and -8- for "Display group

number 28" and confirm entry with -Q- button.

System in basic setting 28

1

2

3

4

Indicated on display: (1 to 4

display zones)

Only continue with the test when

The Engine Coolant Temperature (ECT) is

above 85 C - Display zone 3-

Ignition system, servicing

28-34

- Depress brake pedal and hold.

- Depress accelerator down to wide open throttle

position.

Engine speed will be increased by Engine

Control Module (ECM) to approx. 2300 rpm.

- Depress brake pedal and accelerator and hold

until display in display zone 4 jumps from "Test
OFF" to "Test ON".

- Depress and hold brake pedal and accelerator

until display zone 4 displays specification "Syst.
OK."

- Release brake and accelerator pedals.

- Press

button.

- Press buttons -0- and -6- for function "End

output" and confirm entry with -Q- button.

- Switch off ignition.

If "Syst.n.OK." appears in display zone 4:

- Check resistance and wiring for knock sensors

Page 28-35

.

Ignition system, servicing

28-35

Checking resistance and wiring

Knock Sensor (KS) 1 -G61-

- Separate 3-pin connector to

Knock Sensor (KS) 1 -G61-
(arrow) on right of cylinder head.

- Measure resistance between

terminals 1 and 2, 1 and 3, and 2
and 3 at connector to Knock
Sensor (KS) 1 -G61-.

Specification:

Ignition system, servicing