Checking The Components And Wiring
CAUTION:
Do not apply rust solvent spray or grease to the heated oxygen sensor (HO2S) connector.
Check the heated oxygen sensor (HO2S) connector. Check for contact resistance and oxidation.
Check the cable between engine control module (ECM) terminal #A28 (#A28) and heated oxygen sensor (HO2S) terminal #2. Check for an open-circuit.
NOTE:
If possible, measure from the rear of the affected connectors in order to minimize any damage and future loose connections.
Try a new heated oxygen sensor (HO2S) if the above fault-tracing does not remedy the fault.
Remedy as necessary.
Other information
- see CONNECTING THE BREAKOUT BOX
- For 5 cylinder turbocharged engines -2004, see SIGNAL DESCRIPTION
- For 5 cylinder turbocharged engines 2005-, see SIGNAL SPECIFICATION .
- For 6 cylinder engines -2004, see SIGNAL SPECIFICATION
- For 6 cylinder engines 2005-, see SIGNAL SPECIFICATION .
- For B5xx4T, see HEATED OXYGEN SENSOR (HO2S), REPLACING
- For B6xx4T, see HEATED OXYGEN SENSOR (HO2S), REPLACING .
- see CHECKING WIRING AND TERMINALS
- Continue
Refer to VERIFICATION