Camshaft Position Sensor 1, Checking

Camshaft Position Sensor 1, Checking

Special tools, testers and auxiliary items required

• multimeter

• Voltage Tester

• connector test kit

• test box

Both camshaft position (CMP) sensors supply the Engine Control Module (ECM) with the position of intake camshafts.

• Camshaft Position (CMP) Sensor (G40) is located at front of right cylinder head (bank 1).

Test requirement:

• Ignition switched off.

- Remove air filter housing.

Checking activation

- Connect voltage tester with measuring probes and connector adapters between terminal 2 (CMP sensor signal) and terminal 1 (+5 V); the harness connector remains connected.

• Connector sockets are numbered respectively on the rear side of the connector.

- Operate starter for a few seconds.

LED must blink.

• Voltage testers do not go out completely during low current pick-up between activations by the ECM, but rather continue to glow a little and then get significantly brighter during activation.

- Switch ignition off.

If LED does not blink:

Checking voltage supply

- Disconnect electrical harness connector from Camshaft Position (CMP) Sensor (G40).

- Connect multimeter for voltage measurement as follows:









- Switch ignition on.

Specified value: about 5 V

- Switch ignition off.

Checking signal wire

- Connect multimeter for voltage measurement as follows:









- Switch ignition on.

Specified value: approx. +5 V

- Switch ignition off.

Checking Ground (GND) wire

- Connect multimeter for voltage measurement as follows:









Specified value: approx. +5 V

If all specified values are being reached and the LED does not blink (measured between terminal 1 and 2 with starter and connector connected):

- Replace Camshaft Position (CMP) sensor.

If specified values are not obtained:

Checking wire connections between Camshaft Position (CMP) sensor and Engine Control Module (ECM)

- Connect test box to wiring harness of Engine Control Module (ECM) ; ECM is not connected.

- Check the following wire connections for open circuit according to wiring diagram:

• Camshaft Position (CMP) Sensor (G40) (bank 1)









Specified value: Wire resistance max 1.5 ohms

- Check wires for short circuit to each other as well as to B+ and Ground (GND).

Specified value: infinite ohms (no continuity)

- If necessary, repair wire connection.

Final procedures

- Install air filter housing.

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

1. Check DTC memory => [ Diagnostic Mode 03 - Read DTC Memory ] Diagnostic Mode 03 - Read DTC Memory.

2. If necessary, erase DTC memory => [ Diagnostic Mode 04 - Erase DTC Memory ] Diagnostic Mode 04 - Erase DTC Memory.

3. If DTC memory was erased, generate readiness code.