Engine Speed Sensor, Checking

ENGINE SPEED SENSOR, CHECKING

Special Tools, Testers And Auxiliary Items
- VAG 1598/18 test box
- Multimeter (Fluke 83 or equivalent)
- VW 1594 connector test kit
- Wiring diagram

Test Sequence





- Disconnect 3-pin harness connector from sensor -1-.





- Connect VAG 1598/18 test box to ECM wiring harness.





- Check wiring for open circuits between test box and 3-pin connector -1-, according to wiring diagram.
- Terminal 1 and test box socket 67
- Terminal 2 and test box socket 68
- Terminal 3 and test box socket 56
- Wire resistance: Max. 1.5 Ohms
- Additionally check wires for short to one another.
- Terminal 1 and test box socket 68
- Terminal 1 and test box socket 56
- Terminal 2 and test box socket 56
- Specification: Infinity Ohms (no continuity)

If no wiring malfunction is detected:

- Replace engine speed sensor G28.