Audi Workshop Service and Repair Manuals

A - Gear change signal

This signal causes the ignition timing to be briefly retarded (torque reduction) during gearshifts in order to smooth out the jolts experienced when changing gear.

• ‒ Read measured value block, Display Group 19, engine at idling speed

• ‒ Observe display in display zone 3.

• Specification: X 1 X

• ‒ Take the vehicle for a test drive.

• Specification: X 0 X

If the specification is not obtained:

• ‒ Connect test box V.A.G 1598/22 to wiring harness for engine control unit
  .

The following wiring connections should be checked for open circuits and/or short to positive or negative.

• ‒ Rectify any open/short circuit as necessary.

B - Accelerator pedal position signal

This signal is required for load-dependent calculation of the gearshift times.

The signal is monitored by the self diagnosis (fault memory, read measured value block) of the automatic gearbox control unit.

Signal testing

=> Automatic gearbox; Repair Group 01

C - Engine speed signal

This signal is required for calculating how to smooth out the gearshifts.

Signal testing
=> Checking engine speed signal, Page 24-86

D - Selector lever position signal

This signal is required for idling speed stabilisation.

When a gear is selected, the idling speed is reduced in order to alleviate vehicle "creeping".

• ‒ Read measured value block, Display Group 20, engine at idling speed

• ‒ Observe display in display zone 2.

• Specification: Neutral

• ‒ Operate the footbrake and engage a gear.

If the specification is not obtained:

• ‒ Connect test box V.A.G 1598/22 to wiring harness for engine control unit
  => Page 24-6.

The following wiring connections should be checked for open circuits and/or short to positive or negative.

• ‒ Rectify any open/short circuit as necessary.