Checking air conditioner compressor shutoff: Audi TT Mk1 1.8 (BAM, BFV)

🧭 Before you start

Connect the tester, open engine electronics, read measured value block 050 at idle and watch display zone 4. Switch the air conditioning off, then on with Auto at maximum so the compressor runs, and blip the throttle. If the shutoff does not show, connect the adapter cable to the harness only, check the listed wiring for open circuit and shorts, repair it and recheck the air conditioning.

Fits: Audi TT Mk1 (8N)

Don't miss

• Engine must be idling when you open the engine electronics on the tester.
• Make sure the compressor is actually running before the throttle burst.
• Connect the test box to the harness only, not to the engine control unit.
• Check each listed wire for open circuit and for shorts to earth and positive.

Written for this job from the workshop steps below · TorqFix editorial.

🔧 Engine codes this applies to

📐 54 workshop diagrams for BAM

Real factory drawings for this job — timing marks, bolt locations and routing. Locked in the free view.

📋 Procedure

1. Connect vehicle diagnostic, testing and information systemVAS 5051 A and select vehicle system "“01 - Engine electronics”". The engine must be idling when doing so.
2. From list (1), select diagnosis function "“08 - Reading measured value block”".
3. Use keypad (2) to enter "“50”" for "“display group 050”" and confirm by touching Q key.
4. Check display in zone (4).
5. Switch off air conditioner.

6. Switch on air conditioner with "“Auto”" button and set air conditioner to maximum cooling/heating output; the compressor must run.
7. Abruptly floor accelerator pedal and release it again (brief burst of throttle).
8. Connect 121-pin adapter cableV.A.G 1598/31 (test box) to wiring harness to engine control unit, but do not connect actual engine control unit .
9. Check for open circuit and short to earth or positive in the following wiring:
10. Repair wiring if necessary.
11. Check operation of air conditioner Heating, air conditioning01.

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