Camshaft Position Sensor: Testing and Inspection

Camshaft Position (CMP) Sensor, Checking

NOTE: Use only gold-plated terminals when servicing terminals in harness connector of sensor.

Recommended special tools and equipment
- V.A.G 1526 multimeter or V.A.G 1715 multimeter
- V.A.G 1594 connector test kit
- Wiring diagram

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 such as, lights and rear window defroster must be switched off.
- Parking brake must be engaged or else daylight driving lights will be switched on.
- Ground (GND) connections between engine and chassis must be OK.

Work sequence (vehicles with engine code AEG)
- Remove engine cover.







- Disconnect 3-pin connector from Camshaft Position (CMP) sensor -G40- (arrow).







- Connect multimeter to terminal 1 (B+) and 3 (Ground) of connector for Camshaft Position (CMP) sensor for voltage measurement.
- Switch ignition on.

Specified value: at least 4.5 V

- Switch ignition off.

If there is no voltage.
- Connect test box to control module wiring harness, connect test box for wiring test. Test Box, Connecting For Wiring Test







- Check wires between test box and connector for open circuit according to wiring diagram.

Terminal 1 + socket 62
Terminal 2 + socket 76
Terminal 3 + socket 67

Wire resistance: max. 1.5 Ohms

- 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 terminals 1 + 3:
- Replace Camshaft Position (CMP) sensor -G40-.
- Erase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data. Diagnostic Mode 4: Reset/Erase Diagnostic Data
- Generate readiness code. Monitors, Trips, Drive Cycles and Readiness Codes.

If no errors are found in wires and there was no voltage between terminals 1 + 3:
- Replace Motronic Engine Control Module (ECM) -J220-.

Work sequence (vehicles with engine code AVH, AZG, BBW, BEV)

Vehicles with engine code AVH, AZG, BEV







- Disconnect the 3-pin connector from Camshaft Position (CMP) sensor (arrow).

Vehicles with engine code BBW
- Disconnect 3-pin connector from Camshaft Position (CMP) sensor.

Continued for all vehicles







- Connect multimeter to terminal 1 (B+) and 3 (Ground) of connector for Camshaft Position (CMP) sensor for voltage measurement.
- Switch ignition on.

Specified value: 4.0 to 6.0 V

- Switch ignition off.

If there is no voltage:
- Connect test box to control module wiring harness, connect test box for wiring test. Test Box, Connecting For Wiring Test







- Check wires between test box and connector for open circuit according to wiring diagram.

Terminal 1 + socket 98
Terminal 2 + socket 86
Terminal 3 + socket 108

Wire resistance: max. 1.5 Ohms

- 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 terminals 1 + 3:
- Replace Camshaft Position (CMP) sensor -G40-
- Erase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data. Diagnostic Mode 4: Reset/Erase Diagnostic Data
- Generate readiness code. Monitors, Trips, Drive Cycles and Readiness Codes.

If no errors are found in wires and there was no voltage between terminals 1 + 3:
- Replace Motronic Engine Control Module (ECM) -J220-.