Crankshaft Position Sensor: Testing and Inspection
CHECKING CRANKSHAFT POSITION SENSOR- Check that sensor is tight (properly torqued).
- Disconnect black Crankshaft Position (CKP) sensor harness connector.
3-Pin Connector:
- Connect multimeter (Fluke 83 or equivalent) to harness connector terminals 1 and 2 (in connector holder) with adapter cable from VW 1594 connector test kit.
^ Specified value: approx. 1K ohms
If specified values are not obtained:
- Replace CKP sensor.
If specified value is obtained:
- Connect multimeter first between terminals 1 and 3 (GND) and then between terminals 2 and 3 (GND).
^ Specified value: infinite ohms in each case (no continuity).
If specified values are not obtained:
- Replace CKP sensor.
If specified value is obtained:
- Check wiring between sensor harness connector and Engine Control Module.
Wiring Checks:
- Check for continuity and/or short circuit using wiring diagram.
- Connect VAG 1598/19 test box to ECM wiring harness. Refer to Computer and Control Systems, System Diagnosis, VAG 1598 Pin Out Box Connecting. Connecting VAG 1598/31 Test Box
3-Pin Connector:
- Check shielding by checking for continuity between sensor connector terminal 3 and engine ground.
^ Specified value: maximum 1.0 ohm
- Check wiring for continuity between sensor connector terminal 1 and test box socket A 9.
^ Specified value: maximum 1.0 ohm
- Check signal wire for continuity between sensor connector terminal 2 and test box socket A 10.
^ Specified value: maximum 1.0 ohm
If specified values are not obtained:
- Repair short and/or break in wiring between sensor connector and ECM connector and/or Ground (GND).
ECM Connectors:
3-Pin Connector:
CKP sensor ECM connector A
connector terminal
1 A 9
2 A 10
3 Ground
If no malfunction can be determined:
- Replace ECM.