| DETECTION CONDITION |
- The PCM compares the number of A/F sensor and HO2S inversions for a predetermined time. The PCM monitors the HO2S inversion counts when the following conditions are met: The PCM detects inversion ratio. If the inversion ratio is below threshold, the PCM determine that catalyst system has deteriorated.
- The A/F sensor inversion counts is as prescribed when the following monitoring conditions are met:
- The accumulated occurrence time of the following monitoring conditions has exceeded the prescribed time limit:
MONITORING CONDITIONS
- Catalyst converter temperature: more than 400 °C {752 °F}
- Engine speed: 1,300-3,000 rpm
(MTX), 1,200-3,000 rpm
(ATX)
- LOAD: 16-48 %
(engine speed: 2,000 rpm
)
Diagnostic support note
- This is an intermittent monitor (catalyst).
- The MIL illuminates if PCM detects above malfunction condition in two consecutive drive cycles or in one drive cycle while DTC for the same malfunction has been stored in PCM.
- PENDING CODE is available if PCM detects the above malfunction condition during first drive cycle.
- FREEZE FRAME DATA (Mode 2)/Snapshot data is available.
- The DTC is stored in the PCM memory.
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