With Manufacturer's Scan Tool

Camshaft Position (CMP) Sensor -G40-, Checking


NOTE: Only gold-plated contacts must be used to repair the contacts in the Camshaft Position (CMP) sensor -G40- harness connector.


Special tools and equipment
- VAG1598/31 test box
- Multimeter (Fluke 83 or equivalent)
- VW1594 adapter set
- Wiring diagram

Test conditions
- Camshaft Position (CMP) sensor -G40- screwed on tight
- Battery (B+) voltage at least 11.5 V

Test sequence







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







- Connect multimeter to measure voltage with adapter cables from VW1594 to terminals 1 (B+) and 3 (GND) on Camshaft Position (CMP) sensor -G40- harness connector.
- Switch ignition on.
Specified value: min. 4.5 V
- Switch ignition off.

If no voltage is present:
- Remove wiper arms and plenum chamber cover.







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







- Check wiring for open circuit between test box and harness connector using wiring diagram.
- Terminal -1- + socket 98
- Terminal -2- + socket 86
- Terminal -3- + socket 108 Wire resistance: max. 1.5 ohms
- Also, check if wires are shorted together.
Specified value: infinity ohms

If no malfunction is found in the wiring and voltage was present between terminals -1- + -3-:
- Replace Camshaft Position (CMP) sensor - G40-. Refer item 2 under "Powertrain Management/Ignition System", Service and Repair
- Check DTC memory. if necessary, repair any malfunctions and erase DTC memory.
- Display readiness code.
If the DTC memory has been erased or the ECM was disconnected from permanent battery (B+) voltage, the readiness code must be generated again.

If no malfunction is found in the wiring and no voltage was present between terminals -1- + -3-:
- Replace Engine Control Module (ECM).