Test sequence

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Disconnect connector on intake manifold flap change-over valve.

Fig 1: Measuring Resistance Between Change-Over Valve Terminals

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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:

Fig 2: 2-Pin Electrical Harness Connector & Terminals

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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

Fig 3: Identifying Test Box V.A.G 1598/31 Connected To Control Module Wiring Harness

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Connect test box VAG1598/31 to control unit wiring harness.

Fig 4: 2-Pin Electrical Harness Connector & Terminals

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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 .