Camshaft Position (CMP) Sensor, Checking

Camshaft Position (CMP) Sensor, Checking

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

Recommended special tools and equipment
- VAG1526 multimeter or VAG1715 multimeter
- VAG1594 connector test kit
- Wiring diagram

Test requirements







- Fuses in E-box (plenum chamber, left) 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.
- For vehicles with automatic transmission, selector lever must be in -P-.
- If vehicle is equipped with an A/C system, it must be switched off.
- Ground (GND) connections between engine and chassis must be OK.
- Ignition switched off.


Test sequence







- Disconnect 3-pin connectors from Camshaft Position (CMP) sensors:
1 - Camshaft Position (CMP) Sensor 1 -G40- intake camshaft
2 - Camshaft Position (CMP) Sensor 2 -G163- exhaust camshaft

NOTE: Before disconnecting harness connectors, mark allocation to component.

Checking voltage supply







- Connect multimeter between terminal 1 (B+) and 3 Ground (GND) for voltage measurement for the respective connector for hall sensor.
- Switch ignition on.
Specified value: at least 4.5 V
- Switch ignition off.

If there is no voltage:
- Check wires to Engine Control Module (ECM) according to wiring diagram.

Checking wiring
- 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 for open circuit according to wiring diagram.
Wire resistance: max. 1.5 ohm







- Check wires for short circuit to each other.
Specified value: infinity ohm
- Erase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data. Diagnostic Mode 04 - Erase DTC Memory
- Generate readiness code. Readiness Code

If no malfunctions are found in the wires and there was voltage between terminals 1 + 3:
- Replace the respective Camshaft Position (CMP) sensor:
- Camshaft Position (CMP) Sensor -G40-,
- Camshaft Position (CMP) Sensor 2 -G163-.
- Erase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data. Diagnostic Mode 04 - Erase DTC Memory
- Generate readiness code. Readiness Code

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