Audi Workshop Service and Repair Manuals

Note:

This signal is designed to prevent speed overshoots and jerkiness on switching from throttle open to throttle closed and vice versa when disengaging clutch. It is needed for the cruise control system.

Test sequence

• ‒ Connect vehicle diagnostic, testing and information system VAS 5051 or fault reader V.A.G 1551 and select engine electronics control unit with "Address word" 01
  For this purpose, the ignition must be switched on.

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

• ‒ Enter "066" for "display group number 066" and confirm entry with Q key.

• ‒ Check clutch pedal switch in display zone 2.

If the display is not as described:

Checking switch

• ‒ Remove driver's storage compartment.

=> General Body Assembly - 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 specified value is not attained:

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

If specified value is attained:

Checking power supply

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

• ‒ Switch the ignition on.
• ‒ 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 Fitting Locations

If the LED lights up:

Checking actuation

• ‒ Connect the V.A.G 1598/31 test box to wiring harness leading to engine control unit; the engine control unit should not be connected => Page 24-17.

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

• ‒ Rectify any open/short circuit as necessary.