Needle Lift Sensor

The Needle Lift sensor signal determines start of injection. If it fails, start of injection switches to open-loop control based on engine speed and load. During normal operation, start of injection is controlled in a closed-loop based on engine speed, load and temperature.

Special Tools, Testers And Auxiliary Items:
- Test Box VAG 1598/18
- Hand multimeter VAG 1526 or multimeter VAG 1715
- VW 1594 adaptor kit
- Wiring diagram

Test Sequence:
- Switch OFF ignition





- Disconnect connector -1- for Needle Lift sensor
- Measure resistance between connector terminals
Specification: 80 to 120 Ohms

If specification not obtained:
- Replace cyl. 3 injector with Needle Lift sensor G80
- Display the readiness code

If DTC memory was erased:
- Create readiness code again

If specification obtained:





- Connect Test Box VAG 1598/18 to ECM harness connector





- Check wiring for open circuit between Test Box and connector using wiring diagram:
terminal 1 + socket 12
terminal 2 + socket 11
Wire resistance: max. 1.5 Ohms

- Also check wires for shorting to one another:
- Specification: Infinite Ohms

If wiring OK:
- Replace Diesel direct injection system ECM J248
- Display the readiness code

If DTC memory was erased:
- Create readiness code again