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Home >> Eagle >> 1996 >> Talon Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - Non-Turbo >> Trouble Code Tests >> Test TC-112A - Catalytic Converter Efficiency Failure

Test TC-112A - Catalytic Converter Efficiency Failure

NOTE: For connector terminal ID, see CONNECTOR IDENTIFICATION  Directory. For wiring diagram, see WIRING DIAGRAMS article.
  1. Repair any oxygen sensor related Diagnostic Trouble Codes (DTCs) before proceeding with this test. If no oxygen sensor related DTCs are set, check for any Technical Service Bulletins (TSBs) which may apply. If any TSBs are found to apply, perform TSB action as necessary. Perform TEST VER-2A. If no TSB's apply, go to next step.
  2. CATALYTIC CONVERTER 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 O2 sensor copies upstream O2 sensor with a time lag seen by the Powertrain Control Module (PCM) between switching of O2 sensors. 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. Start engine. Check exhaust system for leaks between engine and downstream O2 sensor. 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.
  4. Check exhaust gas for excessive smoke caused by oil consumption. If a high oil consumption condition is not present, go to next step. If a high oil consumption condition is present, repair engine for mechanical failure and replace catalytic converter. Perform TEST VER-5A.
  5. A newly installed downstream O2 sensor used with an existing (aging) upstream O2 sensor may cause this trouble code to set. If downstream O2 sensor has been replaced within the last 5000 miles, go to next step. If downstream O2 sensor has not been replaced within the last 5000 miles, replace catalytic converter. Perform TEST VER-5A.
  6. If upstream O2 sensor has been replaced within the last 5000 miles, replace catalytic converter. Perform TEST VER-5A. If upstream O2 sensor has not been replaced within the last 5000 miles, replace upstream O2 sensor. Perform TEST VER-5A.
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