Checking intake air temperature sender: VW Passat B5 2.3 (AZX)

🧭 Before you start

Fits: VW Passat B5 (3B)

• Special tools named: V.A.G 1551, V.A.G 1552, V.A.G 1598/31
• Renewed: engine control unit

Don't miss

• Spray sender (arrow) with commercial chilling agent whilst observing the temperature value. The temperature value must decrease.

🔧 Engine codes this applies to

📋 Procedure

1. Connect fault reader V.A.G 1551 (V.A.G 1552). Then switch ignition on and select engine control unit with "“Address word”" 01. (Connect fault reader and select engine control unit )
2. Press keys 0 and 8 for function "“Read measured value block”" and confirm entry with Q key.
3. Press keys 0, 0 and 4 for "“Display group number 4”" and confirm entry with Q key.
4. Read off intake air temperature value in display zone 4.
5. Continuation

6. Continuation
7. Checking sender , continue with ambient temperature
8. Remove intake hose between air mass meter and throttle valve control module.
9. Note intake air temperature value in display zone 4.
10. Spray sender (arrow) with commercial chilling agent whilst observing the temperature value. The temperature value must decrease.
11. Press → button.
12. Press buttons 0 and 6 for function "“End output”" and confirm entry with Q button.
13. Switch off ignition.
14. Pull 5-pin connector off air mass meter G70 with intake air temperature sender G42(arrow).
15. Bridge connector contacts 1+3 using auxiliary cables fromV.A.G 1594 and observe display.
16. Press → button.
17. Press buttons 0 and 6 for function "“End output”" and confirm entry with Q button.
18. Switch off ignition.
19. Renew air mass meter G70
20. Read fault memory, if necessary, repair any faults and then clear fault memory , Reading and clearing fault memory.
21. Press → button.
22. Press buttons 0 and 6 for function "“End output”" and confirm entry with Q button.
23. Switch off ignition.
24. Check lines according to current flow diagram .
25. Pull 5-pin connector off air mass meter G70 with intake air temperature sender G42(arrow).
26. Press → button.
27. Press buttons 0 and 6 for function "“End output”" and confirm entry with Q button.
28. Switch off ignition.
29. Renew air mass meter G70
30. Read fault memory, if necessary, repair any faults and then clear fault memory , Reading and clearing fault memory.
31. Press → button.
32. Press buttons 0 and 6 for function "“End output”" and confirm entry with Q button.
33. Switch off ignition.
34. Check lines according to current flow diagram .
35. Connect test box V.A.G 1598/31 to control unit wiring harness. The engine control unit remains disconnected.
36. Pull 5-pin connector off air mass meter G70 with intake air temperature sender G42(arrow).
37. Check lines between test box and 5-pin connector for open circuit referring to current flow diagram.
38. Additionally check line for short-circuit to battery positive.
39. Measure resistance at contacts 1 (signal) and 3 (earth) on intake air temperature sender G42.
40. Renew air mass meter G70
41. Read fault memory, if necessary, repair any faults and then clear fault memory , Reading and clearing fault memory.
42. Renew engine control unit .

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