Clutch Switch: Testing and Inspection

Clutch Vacuum Vent Valve Switch -F36-, Checking







Special tools and workshop equipment required:

- V.A.G 1526 A Multimeter.
- V.A.G 1527 B LED voltage tester.
- V.A.G 1594 A Connector test kit.
- V.A.G 1598/31 Test box.
- VAS 5051.
- VAS 5051/1 Adapter.

NOTE: This signal helps prevent excessive RPM oscillations and tip-in shocks when clutch is disengaged and is required for the cruise control system.

Test sequence

- Connect VAS 5051 scan tool and select vehicle system "01 - Engine electronics" in selection. Connecting VAS 5051 Scan Tool

When doing this the ignition must be switched on.

Display on VAS 5051 scan tool:







- Under -1- select diagnostic function "08 - Read measured value block".

Display on VAS 5051:







1 - Enter display group.
- Enter "066" for "display group number 066" in field -2- and confirm entry by pressing -Q- button.

Display on VAS 5051:







- Check indication in display field -2-.

Display Group 066:

- Exit function "08 - Read measured value block" by pressing <- button.

If indications do not resemble description:

Checking switch

- Remove driver's storage compartment:







- Disconnect connector from Clutch Vacuum Vent Valve Switch -F36-.







- Connect multimeter between terminals 2 and 3 to measure resistance.
- Specified value: approx. 0 Ohm
- Operate clutch pedal.
- Specified value: infinite Ohm (no continuity).

If specified value is not obtained:
- Replace Clutch Vacuum Vent Valve Switch -F36-.

If specified value is obtained:

Checking voltage supply







- Connect voltage tester V.A.G 1527 B as follows:

Connector Measure to
terminal

3 Car body ground (GND) point

- Switch ignition on.
- LED must light up.

If the LED does not light up:
- Check wiring for open circuit and service if necessary.

If the LED lights up:

Checking activation

- Connect test box V.A.G 1598/31 to wiring harness for Engine Control Module (ECM); do not connect directly to Engine Control Module (ECM). Wiring and Component Testing Using VAG1598/31 Test Box







- Check for open circuit and short to positive (B+) or ground (GND) in following wiring connection:


Connector Test box VAG 1598/31
terminal Socket

2 39

- Repair any open/short circuit as necessary.