Camshaft Position (CMP) Sensor, Checking

Camshaft Position (CMP) Sensor, Checking







Recommended special tools and equipment
- VAG1526A multimeter
- VAG 1527 B Voltage Tester
- VAG1594A connector test kit
- VAG1598/31 test box







NOTE: To reach the harness connectors at cylinder bank 2 (left), the left cover in engine compartment must be removed, the line to Engine Coolant Level (ECL) Warning Switch at bottom on reservoir must be disconnected, bolt (arrow) of coolant reservoir must be unscrewed and set it aside. Coolant hoses -1- to -3- remain connected.

Test requirement:
- Ignition switched off.

Checking activation







- Connect voltage tester e.g. V.A.G 1527 B with measuring probes and connector adapters from V.A.G 1594 A between terminal 2 (CMP sensor signal) and terminal 1 (B+); the harness connector remains connected.

NOTE: Connector sockets are numbered respectively 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.

- Switch ignition off.

If LED does not blink:

Checking voltage supply







- Disconnect electrical harness connectors -1- and -2- at Camshaft Position (CMP) Sensor -G40- and Camshaft Position (CMP) Sensor 3 -G300-.







- Disconnect electrical harness connectors -1- and -2- at Camshaft Position (CMP) Sensor -G163- and Camshaft Position (CMP) Sensor 3 -G301-.







- Connect multimeter for voltage measurement as follows:

Harness connector Terminal Measure to
1 Ground (GND)

- Switch ignition on.

- Specified value: about 5 V

- Switch ignition off.

Checking signal wire







- Connect multimeter for voltage measurement as follows:

Harness connector Terminal Measure to
2 Ground (GND)

- Switch ignition on.

- Specified value: approx. battery voltage

- Switch ignition off.

Checking Ground (GND) wire







- Connect multimeter for voltage measurement as follows:

Harness connector Terminal Measure to
3 B+

- Specified value: about 10 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)

Harness connector Terminal Test box Socket
1 (B+) 98
2 (signal) 87
3 (Ground (GND)) 108

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

Harness connector Terminal Test box Socket
1 (B+) 98
2 (signal) 86
3 (Ground (GND)) 108







- Camshaft Position (CMP) Sensor 3 -G300- (bank 1)

Harness connector Terminal Test box Socket
1 (B+) 98
2 (signal) 81
3 (Ground -GND-) 108

- Camshaft Position (CMP) Sensor 4 -G301- (bank 2)

Harness connector Terminal Test box Socket
1 (B+) 98
2 (signal) 54
3 (Ground -GND-) 108

- 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: Infinity ohm (no continuity)

- If necessary, repair wire connection.

Final procedures
After repair work, the following work steps must be performed in the mentioned sequence:
1. Check DTC memory. Diagnostic Mode 03 - Read DTC Memory
2. If necessary, erase DTC memory. Diagnostic Mode 04 - Erase DTC Memory
3. If DTC memory was erased, generate readiness code.

- End diagnosis and switch ignition off.