DTC P0140 [L3]: Notes
DTC P0140 (L3) DETECTION CONDITION & POSSIBLE CAUSES
| DTC P0140 |
HO2S no activity detected |
| DETECTION CONDITION |
- The PCM monitors the input voltage from the HO2S when the following conditions are met. Under the following monitoring conditions, if the input voltage from the HO2S does not even exceed 0.55 V
though the short term fuel trim is control up to 20.5%
for 9.6 s
, the PCM determines that sensor circuit is not activated.
MONITORING CONDITIONS
- A/F sensor, HO2S, A/F sensor heater, HO2S heater and TWC repair verification drive mode
- Following conditions are met for above 20.8 s
- Engine speed is above 1,500 rpm.
- Engine coolant temperature is above 70°C {158°F}.
- HO2S heater control is ON.
- HO2S voltage is above 0.1 V
Diagnostic support note
- This is an intermittent monitor (A/F sensor, HO2S).
- MIL illuminates if the PCM detects the above malfunction condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM.
- PENDING CODE is available if the PCM detects the above malfunction condition during the first drive cycle.
- FREEZE FRAME DATA is available.
- The DTC is stored in the PCM memory.
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| POSSIBLE CAUSE |
- Looseness HO2S
- Leakage exhaust system
- Open circuit or short to ground in the wiring harness between HO2S terminal A and PCM terminal 2Q
- HO2S deterioration
- HO2S heater malfunction
- Engine malfunction (Leakage engine coolant)
- Insufficient compression
- PCM malfunction
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