DTC P0140:00: Notes
DTC P0140:00 (L3 WITH TC) 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 the HO2S circuit is not activated.
MONITORING CONDITIONS
- Drive Mode 03 (EGR System, 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 (Mode 2)/Snapshot data is available.
- The DTC is stored in the PCM memory.
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| POSSIBLE CAUSE |
- HO2S looseness
- Exhaust system leakage
- 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
- Engine internal malfunction
- Engine coolant leakage into combustion chamber
- Insufficient engine compression
- PCM malfunction
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 Courtesy of MAZDA MOTORS CORP.
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