28-7

Motronic ignition system,
checking

Camshaft Position (CMP) Sensor,
checking

"Camshaft Position Sensor-G40" displayed by

VAG 1551 On Board Diagnostic (OBD) program
(function 02, Check DTC Memory).

- Carry out electrical testing, test steps 2 and 23

Repair Group 01

CMP Sensor voltage supply, checking

- Disconnect 3-pin connector from Camshaft

Position Sensor (G40).

If voltage is OK:

- Connect Fluke 83 hand multimeter (US 1119 or equivalent) to measure voltage

across disconnected connector terminals -1- and -3-, using cables from VAG
1594 adapter kit.

- Switch ignition ON.

Multimeter: 10 Volts (minimum)

- Switch ignition OFF.

If voltage is NOT OK:

- Replace Camshaft Position (CMP) Sensor (G40)

page 28-2

, item -1-.

- Replace Motronic Engine Control Module (ECM) (J220)

Repair Group 24

28-8

Functional check

- Remove fuse 18 (S18).

- Bridge connector and Camshaft Position (CMP) Sensor (G40) using VAG

1315A/4 adapter cable.

- Connect VAG 1527B voltage tester (LED test light) to test connectors -2- and -3-

, using cables from VAG 1594 adapter kit.

- Operate starter.

LED must flicker

If necessary replace Camshaft Position (CMP) Sensor (G40)

page 28-2

,

item -1-

28-9

Ignition Coil (N152), checking

"Ignition Output 1," "Ignition Output 2" or

"Ignition Output 3" displayed by VAG 1551 On
Board Diagnostic (OBD) program (function 02,
Check DTC Memory).

Camshaft Position (CMP) Sensor OK (checking

page 28-7

).

- Carry out electrical testing, test steps 2 and 24

Repair Group 01

Only if the engine will not start:

- Check voltage supply to Ignition Coil (N152).

28-10

Ignition Coil voltage supply, checking

- Disconnect 5-pin connector from Ignition Coil

(N152).

Activation, checking

If LED does NOT flicker:

- Connect Fluke 83 hand multimeter (US 1119 or equivalent) to measure voltage

across connector terminals -1- and -5-, using cables from VAG 1594 adapter kit.

- Switch ignition ON.

Multimeter should read 10 Volts (minimum)

- Switch ignition OFF.

- Remove fuse 18 (S18).

- Connect VAG 1527B voltage tester (LED test light) to connector terminals -5-

and -2-, using cables from VAG 1594 adapter kit.

- Operate starter and check ignition signal from Motronic Engine Control Module

(ECM).

LED must flicker.

- Repeat the test twice more, with the voltage tester connected to terminals -5-

and -3-, then -5- and -4-.

- Replace Motronic Engine Control Module (ECM) (J220)

Repair Group 24