Camshaft Position (CMP) Sensor, Checking

Check Camshaft Position (CMP) sensor

Recommended special tools and equipment

- VAG1526 multimeter or VAG1715 multimeter
- VAG1594 connector test kit
- Wiring diagram

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 such as, for example, 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.

Test sequence (Vehicles with engine code AEG)
Test sequence (Vehicles with engine code AVH, AZG, BDC).
- Remove engine cover.







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







- Connect multimeter to terminal 1 (B+) and 3 (Ground -GND-) 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 for open circuits in wires between test box and connector according to wiring diagram.
Terminal 1 + socket 62
Terminal 2 + socket 76
Terminal 3 + socket 67
Wire resistance: max. 1.5 ohms

- Also 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-, item 9 .
- 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 malfunctions are found in wires and there was no voltage between terminals 1 + 3:

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

Test sequence (Vehicles with engine code AVH, AZG, BDC)







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







- Connect multimeter to terminal 1 (B+) and 3 (Ground -GND-) 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 for open circuits in wires between test box and connector according to wiring diagram.

Terminal 1 + socket 98
Terminal 2 + socket 86
Terminal 3 + socket 108
Wire resistance: max. 1.5 Ohms

- Also 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-, item 15 .
- 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 malfunctions are found in wires and there was no voltage between terminals 1 + 3:

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