Audi Workshop Service and Repair Manuals

Special tools,
testers and auxiliary items required

• ◆ V.A.G 1526 A
• ◆ V.A.G 1527 B
• ◆ V.A.G 1594 A
• ◆ V.A.G 1598 A
• ◆ V.A.G 1598/11
• ◆ VAS 5051 with VAS 5051/1

• or

• ◆ V.A.G 1551 with V.A.G 1551/3 A

Note:

The engine control unit recognises the selector lever position of the automatic gearbox from this signal. With the gear engaged (selector lever set to R/D/4/3/2), idling speed is reduced by approx. 50 rpm to reduce creeping tendency of the vehicle.

Test requirements:

• ● Control unit encoding OK .

Test sequence

• ‒ Read measured value block, Display Group 006, engine at idling speed .

• ‒ Check display in display zone 3.
• ‒ Depress the brake pedal and engage a gear.
• ‒ Value must be incremented by 10.

If the display is not as described:

• ‒ → With the ignition switched off, use adapter V.A.G 1598/11 to connect test box V.A.G 1598 A to connector B and additionally to the engine control unit => Page 24-9.
• ‒ Connect voltage tester V.A.G 1527 B as follows:

• ‒ Switch on ignition.
• ‒ Depress the brake pedal and engage a gear.
• ‒ The LED must light up when a gear is engaged.

If the LED does not light up:

• ‒ Pull connector B off adapter V.A.G 1598/11.

If the LED still does not light up (irrespective of selector lever position):

• ‒ Replace engine control unit .

If the LED then lights up:

• ‒ Check the following wiring for short to earth:

• ‒ If wiring is OK, establish defect in multi-function switch -F125.

If the LED lights up with connector B attached and does not switch off on engaging "P" or "N":

• ‒ Check for open circuit in the following wiring connections:

• ‒ If wiring is OK, establish defect in multi-function switch -F125.