Checking F36 clutch pedal switch F36: Audi 2.7 (ASJ, AZR)

AZR
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 up 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 => Page
01-8
.
For this purpose, the ignition must be switched on.

Rapid data transfer
HELP
Select function XX
When adjacent display appears:

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

Reading measured value block
Q
Enter display group number XXX
When adjacent display appears:

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

Read measured value block 66
⇒
1
2
3
4
Display:

Check clutch pedal switch in display zone 2.

Display zones
1 · 2 · 3 · 4
Display group 066: Signals to engine control unit
Display · xxx km/h · XXXX · xxx km/h · XXXX
Display · ACTUAL speed · Switch settings · SPECIFIED speed · Switch settings
Range · / · X0XX / X1XX
Specified value · X0XX / (clutch pedal / not pressed)
X1XX / (clutch pedal / pressed)
Note: · Value: / X = no meaning

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
General Body Assembly - Interior
Dash panel
Removing driver's shelf

Unplug the connector from clutch pedal switch.
Connect multimeter between contacts 1 and 2 to measure resistance.

Note:

Receptacles are marked on back of plug.

Specified value: approx. 0 ω

Operate clutch pedal.
Specified value: ∞ω (no continuity)

If specified value is not attained:

Replace clutch pedal switch.

If specified value is attained:

Checking power supply

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

Connector / contact · Measure to
2 · Car body earth point

Switch the ignition on.
The LED should light up.

If the LED does not light up:

Check the wiring from contact 2 of connector to central electrics for open circuit via the fuse (in fuse holder):

=> "Current Flow Diagrams, Electrical Fault-finding and Fitting Locations" binder

Rectify open circuit, if necessary

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
24-22
.
Check for open circuit and short to positive or earth in the following wiring connections:

Connector / contact · Test box V.A.G 1598/31 / socket
1 · 39

Rectify any open/short circuit as necessary.