Testing clutch pedal switch -F36 — AUDI

ALZ
Special tools 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 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 vehicle diagnostic, testing and information system VAS 5051 (or fault reader V.A.G 1551) and select engine electronics control unit by entering address word "01" ( => Page
01-12
.)
When doing this 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
Enter display group number XXX
Indicated on display:

Press keys 0, 6 and 6 to select "Display Group 66" and confirm entry with the Q key.

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

Observe display 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
Indicates · Actual speed / · Switch positions · Specified speed · Switch positions for cruise control system
Range · / · off = 0 / on = 1 · / · off = 0 / on = 1
Specification · 0 0 0 0
Note · Relevance of figures / => Page 24-191

Depress clutch pedal

Relevance of figures in 4-digit readout in display zone 2

x · x · x · x · Display zone 2
X · Brake light switch / 0 = Brake pedal not depressed / 1 = Brake pedal depressed
X · Brake pedal switch / 0 = Brake pedal not depressed / 1 = Brake pedal depressed
X · Clutch pedal switch / 0 = Clutch pedal not depressed / 1 = Clutch pedal depressed
X · Cruise control system (CCS) / 0 = CCS deactivated / 1 = CCS enabled

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
Indicates · Actual engine speed / · Switch positions · Switch positions for cruise control system
Range · / · off = 0 / on = 1 · / · off = 0 / on = 1
Specification · 0 1 0 0
Note · Readout must change from 0 to 1

Allow clutch pedal to return slowly to its normal position.
Readout should return from 1 to 0.

If the readout does not change:

Test voltage supply => Page
24-193
.

Testing voltage supply

Remove storage compartment on driver's side.

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

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

2-pin connector on / wiring harness, socket · Specification
2 + earth · Battery voltage

If specification is obtained:

Test wiring connections => Page
24-194
.

If specification is not obtained:

Test wiring from socket 2 of connector for open circuit and short to earth:

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

Testing wiring connection

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
24-26
.

Test the following wiring connections for open circuits and short to positive or earth.

2-pin connector on / wiring harness, socket · Test box V.A.G 1598/31, socket
1 · 65

Resistance in wiring: max. 1.5 Ohm

Rectify any open/short circuit as necessary.

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

If no open circuits are found in wiring:

Renew clutch pedal switch.