With Manufacturer's Scan Tool

Engine Speed (RPM) Sensor -G28- Checking
Engine speed (RPM)sensor -G28- serves dual purpose of speed and reference mark sensor. An inoperative sensor will stop engine.

Special tools
- VAG 1598/22 Test Box (MY 1999)
- VAG 1598/31 Test Box (from MY 2000)
- Fluke 83 multimeter
- VW 1594 Adapter kit
- Wiring diagram

Test sequence
- Switch OFF ignition.
- Disconnect -G28- harness connector.





- Measure resistance between connector terminals 1 + 2.
- Specification: 1000 to 1500 Ohms

If specification not obtained
- Replace Engine Speed sensor -G28-.
- Display the Readiness code. Monitors, Trips, Drive Cycles and Readiness Codes

If DTC memory was erased
- Set the Readiness code. Monitors, Trips, Drive Cycles and Readiness Codes

If specification obtained





- Connect VAG 1598/22 (or 1598/31) Test Box to ECM wiring harness.





- Check wiring for open circuit between Test Box and 3-pin harness connector using Wiring diagram.

Up to MY 1999
- Terminal 1 + socket 69
- Terminal 2 + socket 67
- Terminal 3 + socket 71

From MY 2000
- Terminal 1 + socket 102
- Terminal 2 + socket 110
- Terminal 3 + socket 86
Wire resistance: 1.5 Ohms maximum
- Check wiring for short circuit to one another at 3-pin harness connector using Wiring diagram.
Specification: Infinity Ohms

If wiring OK
- Replace Engine Control Module J248
- Display the Readiness code. Monitors, Trips, Drive Cycles and Readiness Codes

If DTC memory was erased
- Set the Readiness code. Monitors, Trips, Drive Cycles and Readiness Codes