Camshaft Position (CMP) Sensor, Checking

Camshaft Position (CMP) Sensor, Checking

NOTE:
- Always mark connectors before disconnecting (danger of mix-up)!
- Use only gold-plated terminals when servicing terminals in harness connector of Camshaft Position (CMP) sensor.

Special tools and equipment
- VAG1598/31 test box
- VAG1526 Multimeter (Fluke 83 or equivalent) or VAG1715 multimeter
- VAG1594 connector test kit
- Wiring diagram

Test requirements
- Camshaft Position (CMP) sensor bolted securely
- Battery voltage must be at least 11.5 volts.

Test sequence







- Disconnect the 3-pin connector from Camshaft Position (CMP) sensor -G40-.







- Use adapter cables from VAG1594 to connect multimeter for voltage measurement to terminals 1 (B+) and 3 (Ground -GND-) of connector for Camshaft Position (CMP) sensor.
- Switch ignition on. Specification: at least 4.5 V
- Switch ignition off.

If there is no voltage:







- Connect VAG1598/31 test box to control module wiring harness. Engine Control Module (ECM) is not connected.







- Check for open circuits in wires between test box and connector according to wiring diagram.

Terminal 1 + socket 98
Terminal 2 + socket 86
Terminal 3 + socket 108
Wire resistance: max: 1.5 Ohms

- Also check wires for short circuit to each other. Specification: Infinity Ohms

If no malfunctions are found in the wires and there was voltage between terminals 1 + 3:
- Replace Camshaft Position (CMP) sensor -G40-.

Test sequence for Camshaft Position (CMP) sensor 2 -G163- (exhaust camshaft)







- Disconnect the 3-pin connector from Camshaft Position (CMP) sensor 2 -G163-.







- Use adapter cables from VAG1594 to connect multimeter for voltage measurement to terminals 1 (B+) and 3 (Ground -GND-) of connector for Camshaft Position (CMP) sensor.
- Switch ignition on. Specification: at least 4.5 V
- Switch ignition off.

If there is no voltage:







- Connect VAG1598/31 test box to control module wiring harness. Engine Control Module (ECM) is not connected.







- Check for open circuits in wires between test box and connector according to wiring diagram.

Terminal 1 + socket 98
Terminal 2 + socket 87
Terminal 3 + socket 108
Wire resistance: max: 1.5 Ohms

- Also check wires for short circuit to each other. Specification: Infinity Ohms

If no malfunctions are found in the wires and there was voltage between terminals 1 + 3:
- Replace Camshaft Position (CMP) sensor -G163-.
- Check DTC memory, repair any malfunctions and then erase DTC memory.

If no errors are found in wires and there was no voltage between terminals 1 + 3:
- Replace Engine Control Module (ECM).
- Read readiness code. If DTC memory was erased or the Engine Control Module (ECM) was disconnected from the continuous B+ supply, the readiness code must be re-generated. Monitors, Trips, Drive Cycles and Readiness Codes Monitors, Trips, Drive Cycles and Readiness Codes