With Generic Scan Tool
Signal from clutch vacuum vent valve switch, checking
Vehicles with engine code ATQ (121-pin Engine Control Module -ECM-)
Recommended special tools and equipment
- V.A.G 1526 multimeter or V.A.G 1715 multimeter
- V.A.G 1594 Connector test set
- 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. 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
If specified value is obtained:
- Connect test box to control module wiring harness, connect test box 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 circuits 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-.