With Manufacturer's Scan Tool

Camshaft Position (CMP) Sensor -G40-, Checking

Special tools, test equipment and auxiliary items
- VAG 1598/31 test box
- VAG 1526 hand multimeter or VAG 1715 multimeter
- VAG 1594 adapter set
- Electrical Wiring Diagrams

Test conditions
- Camshaft Position (CMP) sensor -G40- installed tightly
- Battery voltage must be at least 11.5 V

Test sequence






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






- Connect multimeter to measure voltage with adapter cables from VAG 1594 to terminals 1 (positive) and 3 (Ground) on Camshaft Position (CMP) sensor connector.
- Switch on ignition.

Specification: min. 4.5 V

- Switch off ignition.

If no voltage is present:
- Remove inner plenum chamber cover, left






- Connect VAG 1598/31 test box to control module wiring harness. Engine Control Module is not connected by this action.






- Check wiring for open circuit between test box and connector using Electrical Wiring Diagrams.
- Contact 1 + socket 98
- Contact 2 + socket 86
- Contact 3 + socket 108

Wire resistance: Max. 1.5 Ohms

- Additionally check wires for short to one another.
Specification: Infinity Ohms

If no malfunctions in wiring are detected and voltage was present between terminals 1 + 3:
- Replace Camshaft Position (CMP) sensor -G40-, item 7.
- Check DTC Memory, if necessary, repair any malfunctions and then Erase DTC Memory, Checking and Erasing DTC Memory. Reading Diagnostic Trouble Codes
- Read readiness code. If DTC memory has been erased or Engine Control Module was disconnected from battery positive, readiness code must be generated again.
Monitors, Trips, Drive Cycles and Readiness Codes
Monitors, Trips, Drive Cycles and Readiness Codes

If no malfunction in wiring is detected and no voltage was present between terminals 1 + 3:
- Replace Engine Control Module.