Clutch Vacuum Vent Valve Switch -F36-, Testing

Clutch Vacuum Vent Valve Switch -F36-, Testing







Special tools and equipment
- VAG 1526 A
- VAG1527 B
- VAG 1594 A
- VAG 1598/31
- VAS 5051 with VAS 5051/1

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 the vehicle diagnostic, testing and information system VAS 5051, Vehicle Diagnostic, Testing and Information System VAS 5051, Connecting and Selecting Functions , and select the vehicle system "01 - Engine electronics" from the menu. When doing this the ignition should be switched on.







Display on VAS 5051:
- Select the diagnosis function "08 - Read data block" from the menu -1-.







Display on VAS 5051:
1 - Enter display group
(figures up to 255)
- Using the keypad -2-, enter "066" to select Display group 066 and confirm entry with Q button.







Display on VAS 5051:
- Check display value for clutch vacuum vent valve switch (display zone -2-).







- Press the <- button to exit from the function "08 - Read data block".

If the display values do not appear as described:

Testing switch
- Remove storage compartment on driver's side.
- Unplug connector from clutch vacuum vent valve switch.







- Connect multimeter for resistance measurement between contacts 1 and 2.

- Specification: approx. 0 Ohm

- Depress the clutch pedal.

- Specification: Infinity Ohms (no continuity)

If the specification is not attained:
- Replace clutch vacuum vent valve switch.

If the specification is obtained:
- Check voltage supply.

Testing voltage supply







- Connect VAG 1527 B voltage tester as follows:

Connector Contact Measure against
1 Body Ground

- Switch on ignition.
- The LED should light up.

If the LED does not light up:
- Test for open circuit in wiring connection between connector terminal 1 to fuse
- Correct any open circuit as necessary.

If the LED lights up:
- Test activation.

Checking activation
- Connect test box VAG 1598/31 to wiring harness for engine control module. Do not connect to the engine control module itself.







- Test for open circuit and short to positive or Ground in the following wiring connections:

Connector Contact Test box VAG 1598/31 Socket
2 39

- Correct short circuit or open circuit if necessary.