Clutch Pedal Switch -F36- Signal, Checking

Clutch vacuum vent valveswitch, checking

The clutch vacuum vent valve switch -F36- signal provides the Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) with information about clutch engagement. This signal is used to provide smoother disengaging and engaging, and to prevent the engine racing when cruise control is in use.

Special tools, testers and auxiliary items:

- VAG1551 or VAG1552 scan tool (ST)
- VAG1551/3 adaptor cable
- VAG1598/18 test box
- Multimeter (Fluke 83 or equivalent)
- VW1594 connector test kit
- Wiring diagram

Test Sequence:

- Connect VAG1551 or VAG1552 scan tool
- Switch ON ignition
- Press -0- and -1- buttons to select "Engine Electronics" address word 01
Display will appear as shown:

Rapid data transfer HELP
select function XX

- Press -0- and -8- buttons to select "Read Measuring Value Block" function 08, and press -Q- button to confirm input
Display will appear as shown:

Read measuring value block HELP
Input display group number XXX

- Press -0-, -0- and -6- to input display group no. 6 (006), and press -Q- button to confirm input
- Checkvalue in display field 2
Display will appear as shown:

Read measuring value block 6 ->
0 km/h 0 0 0 000000 255

Specification: 0 0 0

- Depress clutch pedal
Display will appear as shown:

Read measuring value block 6 ->
0 km/h 1 0 0 000000 255

Specification: 1 0 0 (left display element must change to 1)

If left display does not change:
- Press -> button
- Press -0- and -6- buttons to select "End Output" function 06, and press -Q- button to confirm input
- Switch OFF ignition
- Disconnect harness connector from clutch vacuum vent valve switch






- Measure resistance across switch terminals. Specifications:
Clutch pedal not depressed: max. 10 Ohms.
Clutch pedal depressed: Infinite Ohms. (no continuity)

If resistance is not as specified:
- Replace clutch vacuum vent valve switch -F36-
- Display readiness code

If DTC memory was erased:
- Create readiness code again

If resistance values OK:









- Connect VAG1598/18 test box to Diesel DFI ECM connector
- Check wiring for short circuit between connector terminals
Specification: Infinite Ohms. (no continuity)

If wiring OK:
- Replace Diesel DFI ECM -J248-
- Display the readiness code

If DTC memory was erased:
- Create readiness code again