Clutch Switch: Testing and Inspection

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".

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 066:

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 ohm (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:







- 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.

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







- Repair any open/short circuit as necessary.