DTC P0432-A: CATALYST 2/1 EFFICIENCY FAILURE Chrysler LHS II

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article.

1. Repair any O2S related Diagnostic Trouble Codes (DTCs) before proceeding with this test. If no O2S related DTCs are set, check for any Technical Service Bulletins (TSB) which may apply. If any TSBs are found to apply, perform TSB action as necessary. If no TSB's apply, go to next step.
2. CATALYST 2/1 EFFICIENCY FAILURE DTC sets as converter loses its ability to store oxygen. Efficiency drops and oxygen concentration becomes the same downstream as upstream. Output voltage of downstream O2S copies upstream O2S with a time lag seen by the Powertrain Control Module (PCM) between switching of O2S's. Malfunction Indicator Light (MIL) illuminates after 2 trips and remains on. MIL will go out if conditions that set trouble code are not found on subsequent trips. Go to next step.
3. Possible causes are: faulty catalytic converter, exhaust leaks upstream of catalyst, contaminated fuel or mechanical engine failure. Using scan tool, read Diagnostic Trouble Codes (DTCs). If scan tool display GLOBAL GOOD TRIP is equal to zero, go to step 6 . If scan tool display GLOBAL GOOD TRIP is not equal to zero, go to next step.
4. Using scan tool, read FREEZE FRAME data. Ensure hex code matches DTC on scan tool. Hex code should be B4. If DTC matches hex code on scan tool, go to next step. If DTC does not match hex code on scan tool, repair DTC using FREEZE FRAME data. Perform «TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES»(ref-576-S06971814902000030800000) .
5. Read FREEZE FRAME data on scan tool. Try to duplicate conditions identified on scan tool. O2 monitors must run and pass before catalyst monitor will run. Using scan tool, observe GLOBAL GOOD TRIP counter. If GLOBAL GOOD TRIP counter changed to zero, go to next step. If GLOBAL GOOD TRIP counter does not change to zero, condition to set DTC is not present at this time. Operate vehicle for one DTC GLOBAL GOOD TRIP, then erase DTCs. Perform «TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES»(ref-576-S06971814902000030800000) .
6. Start engine and idle. Check exhaust system for leaks between engine and left bank upstream O2S. If no exhaust leaks are found, go to next step. If exhaust leaks are found, repair or replace exhaust system parts as necessary. Perform «TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES»(ref-576-S06971814902000030800000) .
7. Check exhaust gas for excessive smoke caused by oil consumption or coolant leaks. If a high oil or coolant consumption condition is not present, go to next step. If a high oil or coolant consumption condition is present, repair engine for mechanical failure and replace catalytic converter. Perform «TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES»(ref-576-S06971814902000030800000) .
8. A newly installed left bank downstream O2S used with an existing (aging) left bank upstream O2S may cause this trouble code to set. If left bank downstream O2S has been replaced within the last 5000 miles, go to next step. If left bank downstream O2S has not been replaced within the last 5000 miles, replace catalytic converter. Perform «TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES»(ref-576-S06971814902000030800000) .
9. If left bank upstream O2S has been replaced within the last 5000 miles, replace catalytic converter. Perform «TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES»(ref-576-S06971814902000030800000) . If left bank upstream O2S has not been replaced within the last 5000 miles, replace left bank upstream O2S. Perform «TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES»(ref-576-S06971814902000030800000) .