Camshaft Position (CMP) Sensor, Checking

Camshaft Position (CMP) sensor, checking

Recommended special tools and equipment
- V.A.G1526 multimeter
- V.A.G1594 connector test kit
- V.A.G1527 voltage test lamp

Test requirements






- The respective fuses of Motronic Engine Control Module (ECM) -J220- must be OK.
- Battery voltage must be at least 11.5 volts.
- All electrical consumers like, for example, lights and rear window heating must be switched off.
- Parking brake must be engaged or else daylight driving lights will be switched on.
- For vehicles with automatic transmission, selector lever must be in -P-.
- Ground (GND) connections between engine and chassis must be OK.
- Ignition switched off.

Checking voltage supply

- Disconnect the 3-pin connector for Camshaft Position (CMP) Sensor -G40- on distributor.






- Connect multimeter to outer terminals of the disconnected connector for Camshaft Position (CMP) sensor for voltage measurement.
- Switch ignition on.
Specified value: at least 9.0 V

- Switch ignition off.

If there is no voltage:
- Check wires according to wiring diagram

Checking wiring
Connect test box to control module wiring harness.

Vehicles > 08.99






- Check wires between test box and 3-pin connector to Engine Control Module (ECM) for open circuit according to wiring diagram.
Terminal 1 + socket 56
Terminal 2 + socket 44
Wire resistance: max: 1.5 Ohms

- Check wire between 3-pin connector terminal 3 and relay carrier -G1/4- for open circuit according to wiring diagram.
Wire resistance: max. 1.5 ohms

Vehicles 09.99 >






- Check wires between test box and 3-pin connector to Engine Control Module (ECM) for open circuit according to wiring diagram.
Terminal 1 + socket 67
Terminal 2 + socket 76
Terminal 3 + socket 1
Wire resistance: max. 1.5 ohms

Continue for all vehicles

- Check wires for short circuit to each other.
Specified value: infinite ohms

If no malfunctions are found in the wires and there was voltage between outer terminals:
- Replace distributor with Camshaft Position (CMP) Sensor -G40-
- Erase DTC memory of Engine Control Module (ECM).
- Generate readiness code.

If no malfunctions are found in the wires and there was no voltage between outer terminals:
- Replace Motronic Engine Control Module (ECM) -J220-.