Checking signal from clutch pedal switch: Audi 1.6 (BAH)

Special tools, workshop equipment, testers, measuring instruments and auxiliary items required

Fault reader V.A.G 1551 (or vehicle system tester V.A.G 1552) with cable V.A.G 1551/3
Hand multimeter V.A.G 1526 or multimeter V.A.G 1715

Adapter set V.A.G 1594
Test box V.A.G 1598/22
Current flow diagram

Check conditions

The fuses must be OK.
The battery voltage must be at least 11.5 V.

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 => Page
01-7
.)

Rapid data transfer
HELP
Select function XXX
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
Input display group number XXX
Indicated on display:

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

Read measured value block 66
⇒
1
2
3
4
Indicated on display:
(1...4 = Display zones)

Observe values displayed in display zone 2 (2nd digit from left = clutch pedal switch).
Specification: x 0 x x
Depress clutch pedal fully and observe values in display zone 2.
Specification: x 1 x x
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 specification is not obtained:

Remove cover in footwell (driver's side).
Pull 2-pin connector off clutch pedal switch.

Connect multimeter to measure resistance between contacts 1 and 2.
Specification: approx. 0 ω
Depress the clutch pedal.
Specification: ∞ ω (no continuity)

If the specifications are not obtained:

Replace clutch pedal switch (F36).
Interrogate fault memory, if necessary, repair any faults and then erase fault memory => Page
01-16
, interrogating and erasing fault memory.

If the specifications are obtained:

Connect multimeter to measure voltage with aux. cables from V.A.G 1594 to contact 1 (positive) of clutch pedal connector and earth.
Switch on ignition.
Specification: min. 11.5 V

If the specification is not attained:

Check wire for open circuit between 2-pin connector contact 1 and fuse holder referring to current flow diagram.
Wire resistance: max. 1.5 ω

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

If the specification is obtained:

Connect test box V.A.G 1598/22 to control unit wiring harness
=> Page
24-121
.

Check wire between test box and 2-pin connector referring to current flow diagram.
Contact 2 and test box socket 65
Wire resistance: max. 1.5 ω

Additionally check wires for short to one another, to vehicle earth and to battery positive.
Specification: ∞ω

If no fault is detected in the wiring:

Replace engine control unit
=> Page
24-134
.