With Manufacturer's Scan Tool

Clutch Vacuum Vent Valve Switch -F36-, Checking

The clutch vacuum vent valve switch -F36- informs the control module when the clutch is being engaged or disengaged. This prevents the engine from jolting when disengaging and engaging and also prevents the engine from racing during disengaging operations when the cruise control system is on.

Special tools and equipment
- Scan Tool VAG 1551 or vehicle system tester
- VAG 1552 with cable VAG 1551/3
- Test box VAG 1598/31
- Hand multimeter VAG 1526 or multimeter VAG 1715
- Adapter set VAG 1594
- Wiring diagram

Check conditions







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

Test sequence
- Connect the Scan Tool VAG 1551 (VAG 1552) and with ignition switched on select engine electronics control unit with the "Address word" 01. (Connecting Scan Tool and selecting engine electronics control unit. [1][2][3]Connecting VAG 1551 Scan Tool)

Indicated on display:

Rapid data transfer HELP
Select function XX

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

Indicated on display:

Read measured value block
Enter display group number XXX

- Press buttons -0-, -0- and -6- for "Display group number 6" and confirm entry with -Q- button.

- Observe display in display field 2.

Specification: 0 0 0

Read measured value block 6 ->
0 km/h 00 0 000000 255

- Operate clutch pedal. The left-hand position must change to 1.

Specification: 1 0 0

Read measured value block 6 ->
0 km/h 10 0 000000 255

If the specifications are not obtained:
- Press the -> button.
- Press buttons -0- and -6- for the function "End output" and confirm entry with the -Q- button.
- Switch off ignition.
- Pull connector off clutch vacuum vent valve switch -F36- Fitting locations overview.







- Measure resistance at switch terminals.
Specification
Clutch not depressed: max. 10 Ohm
Clutch depressed:Infinite Ohm

If the specifications are not obtained:
- Replace clutch vacuum vent valve switch -F36-.
- Check DTC memory and, if necessary, repair any malfunctions and then erase. [1][2]Reading Diagnostic Trouble Codes
- Read-out the readiness code. If the DTC memory has been erased or the Diesel Direct Fuel Injection Engine Control Module - J248- was disconnected from permanent battery positive (B+), the readiness code must be generated again.
Monitors, Trips, Drive Cycles and Readiness Codes
Monitors, Trips, Drive Cycles and Readiness Codes

If the specifications are obtained:
- Remove wiper arms and plenum cover:







- Connect test box VAG 1598/31 to control unit wiring harness.

Vehicles through model year > 2001







- Check wiring between test box and connector for open circuit according to wiring diagram.
Terminal 2 + socket 66
Wire resistance: max. 1.5 Ohm
- Check wiring to contact 1 using wiring diagram.

Vehicles from model year 2002 >







- Check wiring between test box and connector for open circuit according to wiring diagram.
Terminal 3 + socket 66
Wire resistance: max. 1.5 Ohm
- Check wiring to contact 1 using wiring diagram.

Continued for all vehicles
- Check wires for short to one another, to vehicle Ground and to battery positive (B+).
Specification: Infinite Ohm

If no fault is detected in the wiring:
- Replace Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) -J248-.