DTC P0140:00 [L5]: Notes
WARNING: This page is about a different car, the 2009 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
DETECTION CONDITION & POSSIBLE CAUSES
| DTC P0140:00 |
HO2S circuit 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 0.6 V
though the short term fuel trim is controlled up to 20.5 % for 20.8 s
, the PCM determines that sensor circuit is not activated
MONITORING CONDITIONS
- A/F sensor heater, HO2S heater, A/F sensor, HO2S and TWC Repair Verification Drive Mode
- Estimated temperature of the zirconia element inside the HO2S above 450°C {842°F}
Diagnostic support note
- This is an intermittent monitor (A/F sensor, HO2S)
- The 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 first drive cycle.
- FREEZE FRAME DATA is available
- The DTC is stored in the PCM memory.
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| POSSIBLE CAUSE |
- HO2S connector or terminal malfunction
- PCM connector or terminal malfunction
- Leakage exhaust system
- Short to ground in wiring harness between HO2S terminal A and PCM terminal 2Q
- Open circuit in wiring harness between HO2S terminal A and PCM terminal 2Q
- HO2S malfunction
- HO2S deterioration
- HO2S heater malfunction
- Engine malfunction
- Engine coolant leakage
- Insufficient compression
- PCM malfunction
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 Courtesy of MAZDA MOTORS CORP.
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