Checking cruise control system (CCS): Audi 2.5 TDI (ACV, AHY, AJT, AUF, …)

🧭 Before you start

Fits: platform codes 70A, 70B, 70C, 70E, 70H, 70J, 70K, 70L, 70M, 7DA, 7DB, 7DC, 7DE, 7DH, 7DJ, 7DK, 7DL, 7DM

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• Connect fault readerV.A.G 1551 and select engine electronics control unit with "“address word 01”". Engine must be idling.
• If necessary, left headlight may have to be released and placed to side to connect test boxV.A.G 1598/31Electrical system; Rep. Gr. 94; Lights, bulbs, switches - exterior.

🔧 Engine codes this applies to

📐 20 workshop diagrams for ACV

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

📋 Procedure

1. Connect fault readerV.A.G 1551 and select engine electronics control unit with "“address word 01”". Engine must be idling.
2. Press keys 0 and 8 for function "“Read measured value block”" and confirm entry with Q key.
3. Press keys 0, 0 and 6 for "“Display group number 6”" and confirm entry with Q key.
4. Observe display in display zone 4.
5. Activate cruise control system

6. Refer to the following table for the different CCS operating statuses:
7. Perform a road test and exceed a speed of 30 km/h (approx. 19 mph) once. Then switch off engine and leave selector lever in position 2, 3 or D.
8. Apply handbrake. [Note: In vehicles with automatic gearbox, voltage supply for CCS switch is only activated at a speeds over 30 km/h and in selector lever positions 2, 3 or D. The voltage supply is then retained even during idling, as long as a gear (except 1 or R) is engaged.]
9. Press → key.
10. Press keys 0 and 6 for function "“End output”" and confirm entry with Q key.
11. Switch off ignition.
12. Connect test boxV.A.G 1598/31 to control unit wiring harness. [Note: If necessary, left headlight may have to be released and placed to side to connect test boxV.A.G 1598/31Electrical system; Rep. Gr. 94; Lights, bulbs, switches - exterior.]
13. Check line connection from engine control unit to CCS control switch for open/short circuit.

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