Audi Workshop Service and Repair Manuals

Notes:

• ◆ In conjunction with the engine speed signal this signal enables the automatic gearbox control unit to calculate the gearshift intervals.
• ◆ The signal is a square wave signal and is taken from contact 7 on the engine control unit.

• ‒ Connect fault reader V.A.G 1551 .
• ‒ Start self-diagnosis on gearbox control unit.

=> Automatic gearbox 01M; Repair Group 01; Self-diagnosis

• ‒ If the gearbox control unit displays fault 00638 "Engine/gearbox electrical connection 2", interrogate fault memory of engine control unit => Page 01-10.

• ‒ If the engine control unit has recorded a fault relating to the throttle valve potentiometer, rectify this fault first. (In this case the fault in the gearbox is a result of the fault in the potentiometer.)

• ‒ → If no fault relating to the throttle valve potentiometer is displayed, connect test box V.A.G 1598/22 to wiring harness for engine control unit => Page 24-8.
• ‒ Test for short or open circuit in wiring between gearbox control unit and contact 7 on engine control unit connector.

=> Current Flow Diagrams, Electrical Fault Finding and Fitting Locations