With Generic Scan Tool

Checking Signal From Clutch Vacuum Vent Valve Switch

Recommended special tools and equipment
- VAG1526 multimeter or VAG1715 multimeter
- VAG1594 connector test kit
- Wiring diagram

Test requirements





- The respective fuses of Clutch Vacuum Vent Valve Switch -F36- must be OK.
- Battery voltage must be at least 11.5 volts.
- All electrical consumers like, for example, lights and rear window heating must be switched off.
- Parking brake must be engaged or else daylight driving lights will be switched on.
- If vehicle is equipped with an A/C system, it must be switched off.
- Ground (GND) connections between engine and chassis must be OK.
- Ignition switched off.

Test sequence
- Remove driver-side storage compartment.
- Disconnect connector from Clutch Vacuum Vent Valve Switch -F36-.

Vehicles with 2-pin clutch vacuum vent valve switch





- Measure resistance between terminals 1 + 2 of switch.
Specified value:
- Clutch pedal not depressed: max. 10.0 Ohms
- Clutch pedal depressed: Infinite Ohms

Vehicles with 4-pin clutch vacuum vent valve switch





- Measure resistance between terminals 2 + 3 of switch.
Specified value:
- Clutch pedal not depressed: max. 1.5 Ohms
- Clutch pedal depressed: Infinite Ohms

Continuation for all vehicles

If specified values are not obtained:
- Replace Clutch Vacuum Vent Valve Switch -F36-.

NOTE: Note installation position of clutch vacuum vent valve switch in the upper installation bore of mounting bracket.

- Erase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data. Diagnostic Mode 4: Reset/Erase Diagnostic Data
- Generate readiness code. Monitors, Trips, Drive Cycles and Readiness Codes

If specified values are obtained:
- Connect test box to control module wiring harness, connect test box for wiring test. Test Box, Connecting For Wiring Test

Vehicles with 2-pin clutch vacuum vent valve switch





- Check wire between test box and 2-pin connector for open circuit according to wiring diagram:

- Vehicles with engine code AEG
Terminal 1 + socket 48
Wire resistance: max: 1.5 Ohms

- Vehicles with engine code AVH, AZG
Terminal 2 + socket 39
Wire resistance: max: 1.5 Ohms

Vehicles with 4-pin clutch vacuum vent valve switch





- Check for open circuits in wire between test box and 4-pin connector according to wiring diagram:

- Vehicles with engine code AEG:
Terminal 3 + socket 48
Wire resistance: max: 1.5 Ohms

- Vehicles with engine code AVH, AZG:
Terminal 3 + socket 39
Wire resistance: max: 1.5 Ohms

Continuation for all vehicles
- Also check wires for short circuit to each other, to vehicle Ground (GND) and to B+. Specified value: Infinite Ohms

If no malfunctions are detected in the wires and the resistance values are OK:
- Replace Motronic Engine Control Module (ECM) -J220-.