With Manufacturer's Scan Tool

Needle Lift Sensor, Checking

The Needle Lift Sensor -G80- signal determines the start of injection. If -G80- fails, start of injection switches to open-loop control (based on engine speed and load). During normal operation, start of injection is controlled via closed-loop function (based on engine speed, load and temperature).

Special tools and workshop equipment required
- 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 Needle Lift Sensor -G80- harness connector.





- Measure resistance between sensor terminals.
Specification: 80 to 120 Ohms

If specification not obtained
- Replace cyl. 3 fuel injector complete with -G80-.
- 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 harness connector using Wiring diagram.

Up to MY 1999
- Terminal 1 + socket 62
- Terminal 2 + socket 55

From MY 2000
- Terminal 1 + socket 109
- Terminal 2 + socket 101
Wire resistance: 1.5 Ohms maximum
- Check wires for shorting to: one another, Ground and Battery +
Specification: Infinity Ohms

If wiring OK
- Replace ECM -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