Camshaft Position Sensor: Testing and Inspection

Camshaft Position (CMP) Sensor, Checking

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

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

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: lights and rear window defroster must be switched off.
- Parking brake must be engaged or else day time 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.

Test sequence







- Disconnect 3-pin connector -1 - from Camshaft Position (CMP) Sensor -G40- (-2-).

Checking voltage supply







- Connect multimeter between connector terminal 1 (B+) and 3 (Ground (GND)) for voltage measurement.
- Switch ignition on.

Specified value: at least 4.5 V

- Switch ignition off.

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

Check wires to control module
- 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 3-pin connector to Engine Control Module (ECM) 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

- 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 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-.