Audi Workshop Service and Repair Manuals

Requirements:

• ● Vehicle diagnostic, testing and information system VAS 5051 connected up and vehicle self-diagnosis selected
• ● Engine idling

Sequence of operations

→ Display on VAS 5051:

• ‒ From list -1- select vehicle system "01 - Engine electronics".
• ‒ Wait until next display appears.

→ Display on VAS 5051:

•     1 -    Engine control unit identification
•     2 -    Immobilizer control unit identification

• ‒ Touch ▸ key.

→ Display on VAS 5051:

• ‒ From list -1- select diagnosis function "08 - Reading measured value block".

→ Display on VAS 5051:

• ‒ Use keypad -2- to enter "006" for "Display group number 006" and confirm by touching Q key.

Note:

On vehicles with automatic gearbox, cruise control system switch is only supplied with power at speeds in excess of 30 km/h and with selector lever set to 2, 3 or D. Power supply is then maintained even at idle, provided that gear (other than 1 or R) is engaged.

• ‒ Perform test drive, exceeding a speed of 30 km/h once. Then leave engine running and selector lever set to 2, 3 or D.
• ‒ Apply parking brake.

→ Display on VAS 5051:

• ‒ Check display in zones -3- and -4-.

    1)    If 255 is displayed: Activate cruise control system
        => Page 01-446

If readings do not match specifications:

• ‒ Check wiring .

Checking wiring

• ‒ Unplug connector at CCS switch.

=> General Body Repairs, Interior; Repair Group 70; Dash Panel

• ‒ Connect appropriate test box V.A.G 1598.. to unplugged connectors of engine control unit.

=> Injection and Glow Plug System; Repair Group 23

Notes:

• ◆ For connection of measuring instruments (e.g. voltage tester V.A.G 1527 B, portable multimeter V.A.G 1526 A), always make use of adapter set V.A.G 1594 A.
• ◆ Contact numbers of connector coincide with socket numbers of test box.

• ‒ → Check for open circuit and short to earth/positive in the following wiring.

• ‒ If necessary, eliminate open circuit in wiring/short circuit.