Clutch Switch: Testing and Inspection

Clutch Vacuum Vent Valve Switch -F36, checking


NOTE: This signal is used to avoid RPM over-oscillation and load change impacts when changing gears and is also used for the cruise control system.


Test sequence
- Connect vehicle diagnostic, testing and information system VAS 5051 or VAG1551 scan tool and select engine electronics control module by entering address word "01". Refer to "Scan Tool Testing/Scan Tool Connecting and Initial Checks", Testing and Inspection

When doing this the ignition must be switched on.

Indicated on display


Rapid data transfer HELP
Select function XX


- Press buttons -0- and -8- to select function "Read Measuring Value Block" and confirm entry with -Q- button.

Indicated on display


Read Measuring Value Block
Input display group number XXX


- Press buttons -0-, -6- and -6- to select "display group number 066" and confirm entry with -Q- button.

Indicated on display


Read Measuring Value Block 66 ->
1 2 3 4


- Observe clutch vacuum vent switch switch in display field 2.

Display Group 66:

If display does not appear as described:

Check switch
- Remove storage compartment on driver's side.
- Disconnect harness connector on clutch switch.
- Connect hand-held multimeter for resistance measurement between terminals 1 and 2.


NOTE: The connector slots are marked on the back side of the connector.


- Specified value: approx.: 0 Ohm
- Depress clutch pedal.
- Specified value: infinity Ohms (no continuity)

If specifications are not obtained:
- Replace clutch vacuum vent valve switch.

If specification is obtained:

Check voltage supply

- Connect VAG1527 B between following sockets on harness connector:

Harness connector Measure against
terminal
2 Ground (GND)

- Switch ignition on.
- The LED must come on

If LED does not come on:
- Check wire connection from terminal 2 of connector for open circuit (fuse) or short circuit to Ground (GND).
- If necessary eliminate open circuit or short circuit to Ground (GND)

If LED comes on:

Check activation

- Connect VAG1598/31 test box to wiring harness for engine control module. Do not connect to the engine control module itself. Refer to "Scan Tool Testing/Wiring And Component Check With VAG1598/31 Test Box", Testing and Inspection

Test the following wiring connections for open circuits and short to B+ or Ground (GND):

Harness connector Measure against
terminal
1 39

- Repair any open/short circuit as necessary.