Checking intake manifold pressure sender G71 and altitude sender F96 — VW

🧭 Before you start

Fits: VW Golf IV / Bora (1J)

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• The turbocharger testerV.A.G 1397A is required to provide an independent figure for comparison. The turbocharger testerV.A.G 1397A must be set to measuring range I (absolute pressure). A barometer can be used instead.
• It must drop briefly to approx. 400 mbar and then assume the value of the altitude sender F96 (display zone 2).

🔧 Engine codes this applies to

📋 Procedure

1. Connect fault readerV.A.G 1551 or vehicle system testerV.A.G 1552 and select engine electronics control unit with "“address word 01”". The ignition must be switched on for this purpose. (Connecting fault reader and selecting engine electronics control unit .)
2. Press buttons 0 and 8 for function "“Read measured value block”" and confirm entry with Q button.
3. Press buttons 0, 1 and 0 for "“Display group number 10”" and confirm entry with Q button.
4. Compare display in display zone 2 (altitude sender F96), display zone 3 (intake manifold pressure sender G71) and display on turbocharger testerV.A.G 1397A with one another. Specification: [Note: The turbocharger testerV.A.G 1397A is required to provide an independent figure for comparison. The turbocharger testerV.A.G 1397A must be set to measuring range I (absolute pressure). A barometer can be used instead.]
5. Press → button.

6. Press buttons 0 and 6 for function "“End data transfer”" and confirm entry with Q button.
7. Switch off ignition.
8. Renew diesel direct injection system control unit J248.
9. Remove right headlight Electrical system94Removing and installing headlight
10. Press → button.
11. Press buttons 0 and 6 for function "“End data transfer”" and confirm entry with Q button.
12. Start engine and select function 08 "“Read measured value block”" again.
13. Press buttons 0, 1 and 0 for "“Display group number 10”" and confirm entry with Q button.
14. Disconnect connector for intake manifold pressure sender G71.
15. Observe value in display zone 3 (intake manifold pressure sender G71).
16. It must drop briefly to approx. 400 mbar and then assume the value of the altitude sender F96 (display zone 2).
17. Renew intake manifold pressure sender G71 with intake manifold temperature sender G72.
18. Press → button.
19. Press buttons 0 and 6 for function "“End data transfer”" and confirm entry with Q button.
20. Switch off ignition.
21. Connect adapter cable, 121-pinV.A.G 1598/31 to control unit wiring harness.
22. Check wiring between adapter cable, 121-pinV.A.G 1598/31 and connector for open circuit referring to current flow diagram.
23. Also check wiring for short to one another, short to vehicle earth and short to battery positive.
24. Renew diesel direct injection system control unit J248.

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