Camshaft Position (CMP) Sensor 2 -G163-, Checking

Camshaft Position (CMP) Sensor 2 -G163-, Checking

Special tools and equipment






- VAG1526A
- VAG1527B
- VAG1594A
- VAG1598/31

If knock sensors fail, knock control is switched off and the ignition angle is retarded slightly since a cylinder allocation is no longer possible.

Engine will continue to run without Camshaft Position (CMP) sensor signal and can also be restarted:
- When a malfunction is recognized, the Engine Control Module (ECM) initiates one ignition spark per cylinder for each crankshaft rotation.
- The offset of one engine rotation will have no noticeable effect on the injection quality. Instead of occurring with intake valves open, injected fuel will be "pre-loaded" (in front of closed intake valve). This has only a minor effect on the quality of the mixture preparation.

Checking activation
- If installed, slide back the rubber boot on the connector for the Camshaft Position (CMP) sensor, but leave the connector connected.






- 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.

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 Camshaft Position (CMP) sensor.






- Connect multimeter for voltage measurement as follows:

Harness connector Measure to
Terminal
1 Engine Ground (GND)

- Switch ignition on.
- Specification: about 5 V

Checking signal wire
- Connect multimeter for voltage measurement as follows:

Harness connector Measure to
Terminal
2 Engine Ground (GND)

- Switch ignition on.
- Specification: approx. battery voltage

Checking Ground (GND) wire






- Connect multimeter for voltage measurement as follows:

Harness connector Measure to
Terminal
3 1

- Specification: about 5 V

If specified values are all obtained and LED does not blink with connector connected (measured between terminals 1 and 2 with engine turning or when engine is being cranked by starter):
- 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 VAG1598/31 test box at wiring harness to ECM, do not connect ECM. Wiring and Component Testing Using VAG1598/31 Test Box






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

Harness connector VAG1598/31 test box
Terminal Socket
1 (B+) 98
2 (signal) 86
3 (Ground -GND-) 108

- 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.
- Unscrew Camshaft Position (CMP) sensor and check whether shutter wheel is mounted properly at camshaft (if mounted improperly, locking lug will get squished when mounting bolt is tightened).
- If position of shutter wheel is OK, check orientation of crankshaft to camshaft.