With Manufacturer's Scan Tool

Needle Lift Sensor, Checking

The needle lift sensor signal is used to determine the start of injection. If it tails the start of injection switches to open-loop control (using engine speed and engine load). During normal operation the start of injection is controlled by a closed-loop function (using engine speed, engine load and engine coolant temperature).

NOTE: The gold-plated contacts must be used to repair terminals in the connector for the needle lift sensor

Special tools and equipment
- Test box VAG 1598/22
- Digital multimeter US1119 (Fluke 83 or equivalent)
- Adapter set VAG 1594
- Wiring diagram

Test sequence





- Disconnect brown 2-pin connector from needle lift sensor (arrow).






- Measure resistance between connector terminals.

- Specification: 80.0 to 120.0 ohms

If the specification is not obtained:
- Replace No.3 cylinder injector together with Needle Lift Sensor -G80- See "Injection Pump, Servicing", item 11. Procedures
- Check DTC memory and, if necessary, repair any malfunctions and then erase. Testing and Inspection
- Read readiness code. Testing and Inspection

If the DTC memory has been erased or the engine control module was disconnected from permanent battery positive (B+), the readiness code must be generated again. Testing and Inspection

If the specification is obtained:
- Remove wiper arms and plenum cover.





- Connect test box VAG 1598/22 to control module wiring harness





- Check wiring between test box and connector for open circuit according to wiring diagram.
Terminal 1 + socket 62
Terminal 2 + socket 55

- Wire resistance: max. 1.5 ohms

- Check wires for short to one another, to vehicle Ground and to battery positive (B+).

- Specification: Infinity ohms

If wiring and the resistance measurement values are OK:
- Replace engine control module. Service and Repair