Clutch Switch: Testing and Inspection

Checking signal from clutch vacuum vent valve switch

Vehicles with engine code ATW, AUG, AWM

Recommended special tools and equipment
- V.A.G 1526 portable multimeter or V.A.G 1715 multimeter
- V.A.G 1594 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 2-pin connector from Clutch Vacuum Vent Valve Switch -F36-.







- Measure resistance between terminals 1 + 2 of switch.
Specified value Clutch pedal not depressed: max. 1.5 Ohms
Clutch pedal depressed: infinity Ohms

If specified values are not obtained:
- Replace Clutch Vacuum Vent Valve Switch -F36-.
- Erase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data.
- Generate readiness code. Refer to "Monitors, Trips and/or Drive Cycle/Readiness Code, Generating".
Monitors, Trips, Drive Cycles and Readiness Codes

If specified values are obtained:







- Connect multimeter between terminal 1 and Ground (GND) for voltage measurement.
Specified value: at least 11.5 V

If specified value is not obtained:
- Check wire between 2-pin connector terminal 1 and central electronics for open circuit according to wiring diagram.
Wire resistance: max: 1.5 Ohms

If specified value is obtained:
- Connect test box to control module wiring harness, connect test box for wiring test. Refer to "Scan Tool Connecting/Test Box, Connecting For Wiring Test".
Test Box, Connecting For Wiring Test







- Check wire between test box and 2-pin connector for open circuit according to wiring diagram.
Terminal 2 + socket 39
Wire resistance: max: 1.5 Ohms

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

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