Camshaft Position Sensor: Testing and Inspection

Diagnostic Procedures

Camshaft Position Sensor, Checking

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

Special tools, testers and auxiliary items required

• Multimeter (VAG1526) or Multimeter (VAG1715)

• Connector test kit (VAG1594)

• 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

• 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.

- Check wires between test box and 3-pin connector for open circuit according to wiring diagram.





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.

- Generate 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.

- Generate 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) --> [ Engine Control Module, Replacing ] Engine Control Module, Replacing.

Final Procedures

After the repair work, the following work steps must be performed in the following sequence:

1. Check the DTC memory. Refer to --> [ Diagnostic Mode 03 - Read DTC Memory ] Diagnostic Modes 01 - 09.

2. If necessary, erase the DTC memory. Refer to --> [ Diagnostic Mode 04 - Erase DTC Memory ] Diagnostic Modes 01 - 09.

3. If the DTC memory was erased, generate readiness code. Refer to --> [ Readiness Code ] Readiness Code.