Camshaft Position (CMP) Sensor, Checking

Camshaft Position (CMP) Sensor, Checking

Special and Equipment






- VAG1526A
- VAG1527B
- VAG1594A
- VAG1598/31


NOTES:
- Camshaft Position (CMP) Sensor -G40- is located at rear of left cylinder block (bank 2).
- Camshaft Position (CMP) Sensor 2 - G163- is located at front of right cylinder block (bank 7).


Checking activation
- Slide back rubber grommet at connector of the respective Camshaft Position (CMP) Sensor (connector remains connected to Camshaft Position (CMP) Sensor).







- Connect VAG1527B voltage tester between sockets 2 (CMP sensor signal) and 1 (B+).


NOTE: Connector socket numbers are shown on the rear side of the connector.


- Operate starter for a few seconds.
- LED must blink briefly at every second engine rotation.


NOTE: 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.


If LED does not blink:

Checking voltage supply
- Disconnect connector at respective Camshaft Position (CMP) sensor.
- Switch ignition on.







- Connect multimeter for voltage measurement as follows:







- Specification: about 5 V

Checking signal wire







- Connect multimeter for voltage measurement as follows:







- Specification: approx. battery voltage

Checking Ground (GND) wire
- Connect multimeter for voltage measurement as follows:







- Specification: approx. battery voltage

- Repair open circuit or short circuit if necessary.

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 respective Camshaft Position (CMP) sensor.

If specified values are not obtained:

Checking wire connections between Camshaft Position (CMP) sensor and Engine Control Module (ECM)
- Connect VAG1598/31 test box at wiring harness to ECM, do not connect ECM. Connecting VAG 1598/31 Test Box







- Check the following wire connections for open circuit and short circuit to Ground (GND) and B+:

Camshaft Position (CMP) Sensor 2 -G40- (bank 2)







Camshaft Position (CMP) Sensor 2 -G163- (bank 1)







- Repair open circuit or short circuit if necessary.
- If, after erasing DTC memory for the sake of the test, a DTC relating to the Camshaft Position (CMP) sensor (hall sensor) is indicated again, even though all previous tests were OK, the following malfunction is possible:
- Shutter wheel for Camshaft Position (CMP) sensor is not aligned properly.