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 such as, for example, lights and rear window defroster 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. 1.5 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:

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 11.5 V
- 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 11.5 V
- 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

Continuation for all vehicles
If specified value is obtained:
- Connect test box to control module wiring harness, connect test box 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.
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 for open circuit according to wiring diagram.
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-.