Checking clutch pedal switch -F36 — AUDI

AQF AQH ARU AKC AUW AVN AVP
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.

Connect the 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
01-15
.
For this purpose, the ignition must be switched on.

Rapid data transfer
HELP
Select function XX
Indicated on display:

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

Read measured value block 08
Enter display group number XXX
Indicated on display:

Press keys 0, 6 and 6 for "display group number 66" and confirm entry with Q key.

Read measured value block 66
⇒
1
2
3
4
Indicated on display:

Observe readout in display zone 2.

Display zones
1 · 2 · 3 · 4
Display group 66: Signals to engine control unit
Display · xxx km/h · 0 0 0 0 · xxx km/h · 0 0 0 0
Display · ACTUAL speed · Switch settings · SPECIFIED speed · Switch positions for cruise control system
Range · / · off = 0 / on = 1 · / · off = 0 / on = 1
Specified value · 0 0 0 0
Note · Relevance of figures => Page 24-199

Operate clutch pedal

Significance of 4 digit readout of display zone 2:

x · x · x · x · Display zone 2
X · Brake light switch / 0 = Brake pedal not operated / 1 = Brake pedal operated
X · Brake pedal switch / 0 = Brake pedal not operated / 1 = Brake pedal operated
X · Checking clutch pedal switch / 0 = Clutch pedal not operated / 1 = Clutch pedal operated
X · Cruise control system (CCS) / 0 = CCS deactivated / 1 = CCS activated

Display zones
1 · 2 · 3 · 4
Display group 66: Signals to engine control unit
Display · xxx rpm · 0 1 0 0 · xxx km/h · 0 0 0 0
Display · Actual engine speed / (actual value) · Switch settings · Switch positions for cruise control system
Range · / · off = 0 / on = 1 · / · off = 0 / on = 1
Specified value · 0 1 0 0
Note · Display should change from 0 to 1.

Allow clutch pedal to return slowly to its normal position.
Display should change from 1 back to 0.

If display does not change:

Check the power supply =>Page
24-201
.

Checking power supply

Remove driver's storage compartment:

=> General Body Assembly, Interior; Repair group 68; Dash panel; Removing driver's storage compartment
General Body Assembly, Interior
Dash panel
Removing driver's storage compartment

Unplug 2-pin connector from clutch pedal.
Connect hand-held multimeter (voltage range) between the following sockets on the connector:
Switch the ignition on.

2-pin connector on wiring harness, socket · Specified value
2 + earth · Battery voltage

If specified value is attained:

Check the wiring =>Page
24-202
.

If specified value is not attained:

Check the wiring connections from socket 2 of connector for open circuit/short to earth.

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

Checking wiring

Connect test box V.A.G 1598/31 to wiring harness for engine control unit; do not connect the engine control unit => Page
24-12
.

Check the following wiring connection for open circuit and short circuit to positive or earth.

2-pin connector on wiring harness, socket · Test box V.A.G 1598/31, socket
1 · 39

Wire resistance: max. 1.5 Ohm

Rectify any open/short circuit as necessary.

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

If no open circuit is detected:

Replace clutch pedal switch.