Audi Workshop Service and Repair Manuals

Note:

This signal is used to avoid over-revving and load change jolts when disengaging the clutch. It is also needed for the cruise control system.

Test sequence

• ‒ Connect the fault reader V.A.G 1551 (V.A.G 1552). Then switch ignition on and select engine control unit with the "Address word" 01.
  (Connecting fault reader and selecting engine control unit
  .)

• ‒ Press keys 0 and 8 for the function "Read measured value block" and confirm entry with Q key.

• ‒ Press keys 0, 0 and 6 for "Display group 6" and confirm with Q key.

• ‒ Observe display in display zone 2.

• Specification: 0 0 0

• ‒ Operate clutch pedal. The left-hand position must change to 1.

• Specification: 1 0 0

If the specifications are not obtained:

• ‒ Press the ⇒key.
• ‒ Press keys 0 and 6 for the "End output" function and confirm input with the Q key.
• ‒ Switch off ignition.

If the specifications are not obtained:

Testing switches

• ‒ Remove storage compartment (shelf) on driver's side.

=> General body repairs, Interior; Repair group 68; Storage compartments, covers; Removing driver's storage compartment

• ‒ Unplug connector from clutch pedal switch.
• ‒ → Connect multimeter to switch (resistance measurement range)

• Specification: approx. 0 ω

• ‒ Depress the clutch pedal.

• Specification: ∞ ω (no continuity)

If the specifications are not obtained:

• ‒ Renew clutch pedal switch.

=> Running gear, Front-wheel drive and four-wheel drive; Repair group 46

If the specifications are obtained:

Testing voltage supply

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

• ‒ Switch on ignition.

• Specification: the LED should light up.

• ‒ Switch off ignition.

If the LED does not light up:

• ‒ Test wiring for open circuits and rectify if necessary.

=> Current flow diagrams, Electrical fault finding and Fitting locations binder

If the LED lights up:

Testing wiring

• ‒ Connect test box V.A.G 1598/31 to wiring harness for engine control unit. Do not connect to the engine control unit itself.
  => Page 24-8.

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

• Resistance in wiring: max. 1.5 ω

• ‒ Rectify short circuit or open circuit if necessary.

=> Current flow diagrams, Electrical fault finding and Fitting locations binder

If no fault is found:

• ‒ Replace engine control unit
  => Page 24-125.