Frequency Valve: Testing and Inspection
OXS Frequency valve, checkingWork sequence
Unplug electrical connector (arrow) from OXS frequency valve
Note: Oxygen sensor frequency valve is located in the passenger side front fender cavity.
- Using LED test light US 1115, connect red test lead to terminal 1 and black lead to terminal 2 of open OXS frequency valve connector
- Initiate output diagnosis sequence until code 4441 for OXS frequency valve is displayed
^ Specification: LED on US 1115 must be OFF
If light is OFF
- Replace OXS frequency valve
If light is ON
- Connect voltmeter between terminal 1 and ground
^ Specification: approx. 12 V
If voltage reading NOT OK
- Check for open circuit in wiring according to current flow diagram
If voltage reading OK
- Remove control unit cover, located in front passenger footwell
- Unplug control unit connector
- Connect ohmmeter between terminal 8 of open control unit connector and terminal 2 of open OXS frequency valve connector
^ Specification: approx. 10 ohm
If ohmmeter reading NOT OK
- Check for open circuit in wiring between frequency valve connector and control unit connector according to current flow diagram
If ohmmeter reading OK
- Replace control unit