Test sequence

WARNING: This page is about a different car, the 1999 Volkswagen Jetta, 1998 Volkswagen Jetta, and 1997 Volkswagen Jetta. However, it is still accessible from the selected car via links, so may be relevant.

Switch ignition off.
Disconnect harness connector -1- for needle lift sensor.
Measure resistance across connector terminals.
Specification: 80 to 120 ohms (ohm)

Fig 1: Measuring Resistance Across Needle Lift Sensor Connector Terminals

If resistance is not as specified:

Replace cyl. 3 injector, see item 14 .
Display readiness code, see READINESS CODE, DISPLAYING .

If DTC memory was erased:

Create readiness code again, see READINESS CODE, SETTING (UP TO M.Y. 1997) .

If resistance is OK:

Connect VAG1598/18 test box to Diesel DFI ECM connector.

Fig 2: Connecting VAG1598/18 Test Box To Diesel DFI ECM Connector
Check for open circuit between test box and connector:
- Terminal 1 and test box socket 12
- Terminal 2 and test box socket 11
- Wire resistance: max. 1.5 ohms (ohm)
Fig 3: Identifying Needle Lift Sensor Harness Connector Terminals
Check wiring for short circuit between connector terminals.
Specification: INFINITY ohm (no continuity)

If wiring is OK:

Replace Diesel DFI ECM -J248-, see item 3 , and display readiness code, see READINESS CODE, DISPLAYING .
If DTC memory was erased, create readiness code again, see READINESS CODE, SETTING (UP TO M.Y. 1997) .