Test TC-180A - Right Catalytic Converter Efficiency Failure
NOTE:
For connector terminal ID, see CONNECTOR IDENTIFICATION Directory. For wiring diagram, see WIRING DIAGRAMS
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- Repair all oxygen sensor trouble codes first. If any oxygen sensor trouble codes are set, go to DTC TEST and perform appropriate test. If no oxygen sensor trouble codes are set, go to next step.
- If any Technical Service Bulletins (TSB's) apply to vehicle, perform appropriate repair. Perform TEST VER-5A. If no TSB's apply to vehicle, go to next step.
- CATALYTIC CONVERTER EFFICIENCY FAILURE DTC sets when converter loses the ability to store oxygen, efficiency drops, and concentration of oxygen becomes the same downstream as upstream. If output voltage of downstream O2S copies output voltage of upstream O2S with a time lag (seen by PCM) between switching O2S's. The Malfunction Indicator Light (MIL) will illuminates after 2 trips and remains on. MIL will go out if conditions that set trouble code are not found on subsequent trips. Possible causes are:
- Catalytic converter failure
- Exhaust leaks upstream of catalyst
- Contaminated fuel
- Mechanical engine problem.
- Check exhaust system for leaks between engine and downstream O2S. If any exhaust leaks are present, repair as necessary. Perform TEST VER-5A. If exhaust leaks are not present, go to next step.
- Check exhaust for excessive oil consumption. If high oil consumption is not present, go to next step. If high oil consumption is present, repair engine mechanical failure as necessary and replace catalytic converter. Perform TEST VER-5A.
- A newly installed downstream O2S along with an existing (aging) upstream O2S may cause this trouble code to set. If right downstream O2S has been replaced within the last 5000 miles, go to next step. If right downstream O2S has not been replaced within the last 5000 miles, replace catalytic converter. Perform TEST VER-5A.
- If upstream O2S has been replaced within the last 5000 miles, replace catalytic converter. Perform TEST VER-5A. If upstream O2S has not been replaced within the last 5000 miles, replace upstream O2S. Perform TEST VER-5A.