Engine Speed (RPM) Sensor -G28-, Checking

Engine Speed (RPM) Sensor -G28-, Checking







Special tools and equipment
- VAG1526A or Fluke 83 Multimeter
- VAG1594A Connector test kit
- VAG1598/31 Test box

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

Work sequence
- Before performing test, check sensor for proper installation and proper fit.
- Disconnect harness connector for engine speed (RPM) sensor (identification: gray harness connector).







- Connect multimeter between terminal 2 and 3 for resistance measurement.
- Specified value: 730 ...1000 Ohms

NOTE: Resistance value of the engine speed (RPM) sensor is based on a temperature of 20 degrees C. Resistance increases as temperature increases.

If specified value is not obtained:
- Replace engine speed (RPM) sensor.

If specified value is obtained:







- Connect multimeter to terminals 2 and 1 (shielding) as well as to terminals 3 and 1 (shielding) for resistance measurement.
- Specified value: each Infinity Ohms (no continuity)

If specified value is not obtained:
- Replace engine speed (RPM) sensor.

If specified value is obtained:
- Connect VAG1598/31 test box at wiring harness to Engine Control Module (ECM) but do not connect ECM. Scan Tool Testing and Procedures







- Check following wiring connections for open circuit and short circuit to Ground (GND) and B+:

Harness connector Terminal VAG1598/31 test box Socket
1 (shielding) 108
2 (Ground) 90
3 (signal) 82

- Repair open circuit in wiring or short circuit if necessary.

If no malfunctions are found in wires:
- Replace Engine Control Module (ECM).