Clutch Switch: Testing and Inspection

Clutch Vacuum Vent Valve Switch -F36- Checking

Special Tools and Equipment







- VAG1526A
- VAG1527B
- VAG1594A
- VAG1598/31
- VAS5051 with VAG5051/1


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 VAS5051 tester and select vehicle system "01 - Engine electronics". Ignition must remain switched on for this. Refer to "Scan Tool Testing/Scan Tool Connecting and Initial Checks/VAS 5051 Tester, Connecting and Selecting Functions" Testing and Inspection







Display on VAS5051:
- Select diagnostic function "08 - Read Measuring Value Block" in selection -1-.







Display on VAS5051:
1 - Enter display group Max. input value = 255
- Select function "066" in button field -2- for "Display group number 066" and press Q button to confirm input.







Display on VAS5051:
- Check Clutch Pedal Position (CPP) switch in display field -2.

Display Group 066:

- Press "08 - erase DTC memory" to end function <- button.

If indications do not resemble description:

Check switch
- Remove driver-side storage compartment.
- Disconnect harness connector at Clutch Pedal Position (CPP) switch.
- Connect multimeter between terminal 1 and 2 for resistance measurement.
- Specification: approx. 0 ohms
- Depress clutch pedal.
- Specification: infinity ohms (no continuity)

If specified value is not obtained:
- Replace Clutch Pedal Position (CPP) switch.

If specified value is obtained:
- Check voltage supply

Checking voltage supply







- Connect VAG1527B voltage tester as follows:







- Switch ignition on.
- LED must light up.

If LED does not light up:
- Check wire connection from terminal 1 of connector to fuse for open circuit:
- Repair open circuit if necessary.

If LED lights up:
- Checking activation.

Checking activation
- Connect VAG1598/31 test box at wiring harness to Engine Control Module (ECM), do not connect ECM. Refer to "Scan Tool Testing/Wire and Component Testing Using VAG1598/31 Test Box" Testing and Inspection







- Check the following wire connection for open circuit and short circuit to Ground (GND) and B+:







- Repair open circuit or short circuit if necessary.