Clutch Switch: Testing and Inspection

Special tools, workshop equipment, testers, measuring instruments and auxiliary items required
- VAG1551 scan tool or vehicle system tester V.A.G 1552 with cable V.A.G 1551/3
- Test box V.A.G 1598/31
- Hand multimeter V.A.G 1526 or multimeter V.A.G 1715
- Adapter set V.A.G 1594
- Wiring diagram

Test conditions





- Fuse 7 must be OK.

Test sequence
- Connect the VAG1551 scan tool (V.A.G 1552). Then switch ignition on and select engine control unit with the "Address word" 01. (Connecting scan tool and selecting engine control unit.). Testing and Inspection

Indicated on display:

Rapid data transfer HELP
Select function XX

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

Indicated on display:

Read measured value block HELP
Input display group number XXX

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

Indicated on display:

Read measured value block 66 ->
1 2 3 4

- Observe values displayed in display zone 2 (2nd digit from left).
- 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 shelf on driver's side.
- Pull the connector off the clutch pedal switch.





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

If the specification is not attained:
- Replace clutch pedal switch.

If the specification is obtained:





- Connect multimeter to measure voltage between contact 1 and Ground.
- Specification: at least 11.5 V

If the specification is not attained:
- Check the wiring between 2-pin connector contact 1 and central electrics using wiring diagram.


If the specification is obtained:





- Connect test box V.A.G 1598/31 to control unit wiring harness. The engine control unit remains disconnected.
- Check wiring between test box and 2-pin connector for open circuit using wiring diagram.
- Contact 2+socket 39
Wire resistance: Max. 1.5 Ohms
- Additionally check wires for short to one another.
- Additionally check the wiring for short to battery positive or Ground.