Audi Workshop Service and Repair Manuals

Special tools, testers and workshop equipment required

• ◆ V.A.G 1526 A
• ◆ V.A.G 1527 B
• ◆ V.A.G 1594 A
• ◆ V.A.G 1598/31
• ◆ VAS 5051 with VAS 5051/1

• or

• ◆ V.A.G 1551 with V.A.G 1551/3 A

Note:

This signal prevents engine speed fluctuations and load change jolts when the clutch is disengaged. The signal is also required for the cruise control system.

Test sequence

• ‒ Connect up vehicle diagnosis, measurement and information system VAS 5051 or fault reader V.A.G 1551 and select engine electronics control unit with "Address word" 01 .
  When doing this the ignition must be switched on.

• ‒ Enter "08" to select the function "Reading measured value block" and confirm entry with Q key.

• ‒ Enter "066" to select "Display Group 066" and confirm entry with the Q key.

• ‒ Check clutch pedal switch in display field 2.

If the display is not as described:

Checking switch

• ‒ Remove driver's storage compartment.

=> General body repairs - Interior; Repair group 68; Dash panel; Removing driver's shelf

• ‒ Unplug the connector from clutch pedal switch.

Note:

Receptacles are marked on back of plug.

• ‒ Connect multimeter between contacts 1 and 2 to measure resistance.
• ‒ Specified value: approx. 0 ω
• ‒ Operate clutch pedal.
• ‒ Specified value: ∞ ω (no continuity)

If the specified value is not attained:

• ‒ Checking setting of switch or
• ‒ Replace clutch pedal switch.

If the specified value is attained:

Checking voltage supply

• ‒ → Connect voltage tester V.A.G 1527 B as follows:

• ‒ Switch on the ignition.
• ‒ The LED should light up.

If the LED does not light up:

• ‒ Check the wiring between contact 1 of connector and fuse for open circuit/short to earth.

=> "Current Flow Diagrams, Electrical Fault Finding and Installation locations" binder

If the LED lights up:

Checking actuation

• ‒ Connect the V.A.G 1598/31 test box to wiring harness leading to engine control unit; engine control unit should not be connected => Page 24-20.

• ‒ → Check for open circuit and short to positive or earth in the following wiring connections:

• ‒ Rectify any open/short as necessary.