Camshaft Position Sensor: Testing and Inspection

Camshaft Position (CMP) Sensor -G40-, Checking

Required special tools and test equipment
- VAG 1598/22 test box
- Multimeter US 1119 (Fluke 83 or equivalent)
- VW 1594 connector test kit
- Wiring diagrams

Checking
- Disconnect 3-pin connector from Camshaft Position -G40- sensor.







- Connect multimeter US 1119 (Fluke 83 or equivalent) to measure voltage across CMP connector terminals 1 (B+) and 3 (Ground), using adapter cables from VW 1594 connector test kit.
- Switch ignition on.
- Measure voltage between terminals 1 and 3.
Specified value: 4.5 volts minimum
- Switch ignition off.

If voltage is OK:
- Connect VAG 1598/22 test box to Motronic ECM harness connector. Refer to "Scan Tool Testing/Scan Tool Connecting and Initial Checks/Connecting VAG 1598/22 Test Box" Testing and Inspection







- Check wiring for open circuit between ECM/test box and 3-pin harness connector, according to wiring diagram.
- Connector terminal 1 to ECM/test box socket 11
- Connector terminal 2 to ECM/test box socket 76
- Connector terminal 3 to ECM/test box socket 67
- Specified value: max. 1.5 Ohms

- Check wiring for short circuit between ECM/test box and 3-pin harness connector, according to wiring diagram.
- Connector terminal 2 to ECM/test box socket 11
- Connector terminal 3 to ECM/test box socket 11
- Connector terminal 3 to ECM/test box socket 76
- Specified value: Infinity Ohms

If wiring is OK (and voltage across terminals 1 and 3 is OK):
- Replace Camshaft Position (CMP) sensor.

If wiring is OK (but still no voltage across terminals 1 and 3):
- Replace Motronic ECM -J220-.
- Carry out adaptation of throttle valve control module to ECM.
- Check readiness code. If Diagnostic Trouble Code (DTC) memory has been erased, or ECM was disconnected, generate new readiness code.
Refer to "Monitors, Trips and/or Drive Cycle/Displaying Readiness Code" Testing and Inspection
Refer to "Monitors, Trips and/or Drive Cycle/Generating Readiness Code" Testing and Inspection