Checking intake manifold flap motor V157 — VW

🧭 Before you start

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• Connect fault readerV.A.G 1551 or vehicle diagnostic testerV.A.G 1552 and select engine electronics control unit with "“address word”" 01. Engine must be idling.

🔧 Engine codes this applies to

📋 Procedure

1. Connect fault reader V.A.G 1551 or vehicle diagnostic tester V.A.G 1552 and select engine electronics control unit with "“address word”" 01. Engine must be idling.
2. Press buttons 0 and 3 for function "“final control diagnosis”".
3. Confirm entry with Q button.
4. Press the C button.
5. Press buttons 0 and 6 for function "“End data transfer”" and confirm entry with Q button.

6. Switch off ignition.
7. Pull connector (1) off intake manifold flap motor V157(2).
8. Switch on ignition.
9. Measure supply voltage at intake manifold flap motor contact 2 and at engine earth, then at contact 2 and 1 of connector.
10. Switch off ignition.
11. Connect 121-pin adapter cable V.A.G 1598/31 to control unit wiring harness.
12. Check wiring between test box and connector for open circuit according to current flow diagram.
13. Also check wiring for short to one another, short to earth and short to battery positive.
14. Renew diesel direct injection system control unit J248.

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