Work sequence

• 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  .