Test sequence
WARNING: This page is about a different variant/trim than selected.
- Disconnect connector on intake manifold flap change-over valve.
- Measure resistance between change-over valve terminals.
Specification: 25 to 45 Ω
If specification is not obtained:
- Replace Change-over Valve for intake Manifold Flap N239.
- Check DTC memory and, if necessary, repair any malfunctions and then erase → Diagnostic Trouble Code (DTC) memory, checking and erasing .
- Read readiness code → Reading readiness code . If the DTC memory has been erased, the readiness code must be generated again → Readiness code, setting .
If specification is obtained:
- Set multimeter to measure voltage and connect to terminal 1 and 2 of disconnected connector from Intake Manifold Flap Change-over Valve N239.
- Start engine and run at idling speed.
Specification: at least 4.5 V
- Switch off ignition. Value for voltage must drop to
0.0 V after about 3 seconds.
If voltage values do not change as described:
- Remove wiper arms and plenum cover: → 92 WINDSHIELD WIPER & WASHER SYSTEM
- Connect test box VAG1598/31 to control unit wiring harness.
- Check wiring between test box and connector for open circuit using wiring diagram.
Terminal 1+ socket 1 and 2
Terminal 2+ socket 81
Wire resistance: max. 1.5 Ω
- Check wires for short to one another, to vehicle Ground and to battery positive (B+).
Specification: ∞Ω
If no wiring malfunction is detected:
- Replace Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) J248 → Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) J248 , replacing .