Fuel Shut-off Solenoid: Testing and Inspection

Deceleration fuel shut-off, checking (Vehicles with manual trans. only)
Test conditions

^ Engine coolant temp. minimum 50°C (125°F)

Work sequence
- Start engine and raise engine speed to above 2000 rpm
- Quickly close throttle
^ Air intake boot must visibly contract

If boot DOES NOT contract





- Unplug connector (arrow) from deceleration fuel shut-off valve





- Connect voltmeter across terminals 1 and 2 of open connector
- Raise engine speed to above 2000 rpm
- Quickly close throttle12V
^ Specification: approx.

If voltage reading OK with vacuum hose attached to shut-off valve
- Replace shut-off valve

If voltage reading NOT OK
- Check idle switch

If idle switch OK
- Again raise engine speed above 2000 rpm
^ Specification: approx. 12V

If voltage reading NOT OK
- Check for open circuit in wiring according to current flow diagram

If wiring OK
- Refer to deceleration fuel shut-off signal to control unit

Checking Signal To Control Unit

Test conditions

^ Deceleration fuel shut-off OK

Work sequence





- Connect tester VW 1367 according to manufacturers instructions
- Using test connection US 1112, connect green test lead to OXS system test connection
- Push % button on VW 1367





- Unplug connector from shut-off valve (arrow)
- Start engine and run at idle





- Using jumper cable, connect terminal 2 of open shut-off valve connector to ground
^ Specification: 40% duty cycle

Note: Duty cycle must read 40% regardless of engine rpm

If duty cycle reading NOT OK
- Remove cover of control unit located in front passenger footwell
- Unplug control unit connector









- Using ohmmeter, check for continuity between terminal 2 of shut-off valve connector and terminal 4 of control unit connector A
^ Specification: 0.2 ohm

If ohmmeter reading NOT OK
- Check for open circuit in wiring according to current flow diagram

If wiring OK
- Replace control unit