Clutch Pedal Position Sensor / Switch: Testing and Inspection

Clutch Vacuum Vent Valve Switch -F36-, Checking







Special tools and equipment
- VAG1526A or Fluke 83 Multimeter
- VAG1527B Voltage tester
- VAG1594A Connector test kit
- VAG1598/31 Test box
- VAS5051 Vehicle diagnosis, testing and information system with VAS5051/1 Adapter

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

Work sequence
- Connect VAS5051 tester, Vehicle Diagnostic, Testing and Information System VAS 5051, Connecting and Selecting Functions and select vehicle system "01 - Engine electronics". Ignition must be switched on.







Display on VAS5051:
- Select diagnostic function "08 - read measured 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 vacuum vent valve switch in display field 2.







- Press <- button to end function "08 - Read measuring value block".

If indications do not resemble description:
- Check switch.

Checking switch
- Remove driver's side storage compartment:
- Disconnect harness connector at clutch vacuum vent valve switch.







- Connect multimeter between terminal 2 and 3 for resistance measurement.

- Specified value: approx. 0 Ohm

- Depress clutch pedal.

- Specified value: Infinity Ohms (no continuity)

If specified value is not obtained:
- Replace clutch vacuum vent valve switch.

If specified value is obtained:
- Check voltage supply.

Checking voltage supply







- Connect VAG1527B voltage tester as follows:

Harness connector Measure to
Terminal
2 Chassis Ground (GND)

- Switch ignition on.
- LED must light up

If LED does not light up:
- Check wiring connection from terminal 2 of connector to fuse for open circuit
- Repair open circuit in wiring if necessary.

If LED lights up:
- Check activation.

Checking activation
- Connect VAG1598/31 test box at wiring harness to Engine Control Module (ECM) but do not connect ECM. Scan Tool Testing and Procedures







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

Harness connector VAG1598/31 test box
Terminal Socket
3 39

- Repair open circuit in wiring or short circuit if necessary.