Work sequence
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2001 Volkswagen Jetta, 2001 Volkswagen Golf, 2000 Volkswagen Jetta, 2000 Volkswagen Golf, and 1999 Volkswagen Jetta. However, it is still accessible from the selected car via links, so may be relevant.
- Disconnect intake manifold flap change-over valve connector.
- Measure resistance between change-over valve terminals.
- Specification: 25.0 to 45.0 Ω
If specification is not obtained:
- Replace Intake Manifold Flap Change-over Valve N239.
- Check DTC memory and, if necessary, repair any malfunctions and then erase → Diagnostic Trouble Code (DTC) memory, checking and erasing .
- Read readiness code → Readiness code, displaying .
If DTC memory has been erased, the readiness code must be generated again → Readiness code, setting .
If specification is obtained:
- Measure voltage supply for change-over valve between the terminals of the connector.
- Start engine and run at idling speed.
- Specification: 5.0 to 6.0 V
- Switch ignition off.
- Voltage value must increase to 11.0 to 15.0 Volts (battery voltage) and after approx. 3 seconds fall to 0.0 Volts
If the voltage values do not change as described:
- Remove wiper arms and plenum cover. →92 WINDSHIELD WIPER & WASHER SYSTEM
- Connect test box V.A.G 1598/22 (through my 1999) or test box V.A.G 1598/31 (from my 2000) to control module wiring harness.
- Check wiring between test box and connector for open circuit according to wiring diagram.
| Test box socket no. | ||
| Terminal | Through MY 1999 | From MY 2000 |
| 1 | 3 | 81 |
| 2 | 2 | 1 |
| 2 | 28 | 2 |
- 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 engine control module → Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) J248 , replacing .