Checking Connector, Wiring And Components
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 signal cable (-) between heated oxygen sensor (HO2S) terminal #5 and control module terminal #A42 (#A42). Check the cable for calibration current between heated oxygen sensor (HO2S) terminal #2 and control module terminal #A28 (#A28). Check for an open-circuit.
Check the cable for calibration current between heated oxygen sensor (HO2S) terminal #2 and control module terminal #A28 (#A28). Check the cable for the pump current between heated oxygen sensor (HO2S) terminal #6 and control module terminal #A24 (#A24). Check for a short-circuit to each other.
If the connector and cables are OK try a new heated oxygen sensor (HO2S).
Remedy as necessary.
Other information
- To connect the breakout box / access the control module, see CONNECTING THE BREAKOUT BOX
- For B5xx4T, see HEATED OXYGEN SENSOR (HO2S), REPLACING
- For B6xx4T, see HEATED OXYGEN SENSOR (HO2S), REPLACING .
- 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 .
- see CHECKING WIRING AND TERMINALS .
- Continue
Refer to VERIFICATION