Engine Speed (RPM) Sensor -G28-, Checking

Engine Speed (RPM) Sensor -G28-, Checking







Special tools and equipment

- VAG 1526 A
- VAG 1594 A
- VAG 1598/31

NOTE: The engine speed sensor is a combined speed sensor and reference mark sensor. The engine cannot be started without a signal from the Engine speed (RPM) sensor -G28-. If the signal from the Engine speed (RPM) sensor -G28- fails while the engine is running, the engine will cut out immediately.

Test sequence

- Before performing test, make sure that sensor is correctly installed and firmly seated.
- Disconnect connector to engine speed sensor.







- Connect multimeter between terminals 2 and 3 to measure resistance.
- Specified value: 730 to 1000 Ohm

NOTE: The resistance value of the engine speed sensor is associated with a temperature of 20 degree C. The resistance increases if the temperature increases.

If specified value is not attained:
- Install a new engine speed sensor.

If specified value is attained:







- Connect multimeter between terminals 2 and 1 (screen) and 3 and 1 (screen) to measure resistance.
- Specified value: each case infinite Ohms (no continuity).

If specified value is not attained:
- Install a new engine speed sensor.

If specified value is attained:
- Connect test box VAG1598/31 to wiring harness for engine control module; do not connect engine control module. Wiring and Component Testing Using VAG1598/31 Test Box







- Check for open circuit and short to positive or ground in following wiring connections:

Connector Test box VAG 1598/31
terminal Socket

1 (screening) 108
2 (ground) 90
3 (signal) 82

- Repair any open/short circuit as necessary.

If no wiring malfunction is detected:
- Replace engine control module.