Clutch Switch: Testing and Inspection
Signal From Clutch Vacuum Vent Valve Switch, Checking
Recommended special tools and equipment
- V.A.G 1526 multimeter or V.A.G 1715 multimeter
- V.A.G 1594 connector test kit
- Wiring diagram
Test requirements
- The respective fuses of Clutch Pedal Switch -F36- must be OK.
- Battery voltage must be at least 11.5 volts.
- All electrical consumers such as: lights and rear window defroster must be switched off.
- Parking brake must be engaged or else day time 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 Pedal Switch -F36-.
Checking resistance
Vehicles with 2-pin clutch vacuum vent valve switch
- Check resistance between terminals 1 + 2 of switch.
Specified value
Clutch pedal not depressed: max. 1.5 Ohms
Clutch pedal depressed: Infinite Ohms
Vehicles with 4-pin clutch vacuum vent valve switch
- Check resistance between terminals 2 + 3 of switch.
Specified value
Clutch pedal not depressed: max. 1.5 Ohms
Clutch pedal depressed: Infinite Ohms
Continue for all vehicles
If specified values are not obtained:
- Replace Clutch Pedal Switch h -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:
- Check voltage supply of clutch pedal switch and wiring to control module.
If voltage supply and wires are OK:
- Replace Motronic Engine Control Module (ECM) -J220-.
Checking voltage supply and wiring to control module
Vehicles with 2-pin clutch vacuum vent valve switch
- Connect multimeter between terminal 1 and Ground (GND) for voltage measurement.
- Switch ignition on.
Specified value: at least 11.5V
- Switch ignition off.
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
Vehicles with 4-pin clutch vacuum vent valve switch
- Connect multimeter between terminal 2 and Ground (GND) for voltage measurement.
- Switch ignition on.
Specified value: at least 11.5V
- Switch ignition off.
If specified value is not obtained:
- Check wire between 4-pin connector terminal 2 and central electronics for open circuit according to wiring diagram.
Wire resistance: max. 1.5 Ohms
Continue for all vehicles
- 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 value is obtained:
- Check wires to control module according to wiring diagram.
Check wires to control module
- 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 to Engine Control Module (ECM) for open circuit according to wiring diagram.
Terminal 2 + socket 39
Wire resistance: max. 1.5 Ohms
Vehicles with 4-pin clutch vacuum vent valve switch
- Check wire between test box and 4-pin connector to Engine Control Module (ECM) for open circuit according to wiring diagram.
Terminal 3 + socket 39
Wire resistance: max. 1.5 Ohms
Continue for all vehicles
- Check wires for short circuit to B+ and to Ground (GND).
Specified value: Infinite Ohms
- 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 no malfunctions are detected in the wires and the resistance values are OK:
- Replace Motronic Engine Control Module (ECM) -J220-.