DTC P0138:00 [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 P0138:00 |
HO2S circuit high input |
| DETECTION CONDITION |
- The PCM monitors input voltage from HO2S. If the input voltage from the HO2S is above 1.2 V
or HO2S bias voltage above 1.7 V
, the PCM determines that circuit input is high.
Diagnostic support note
- This is a continuous 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.
|
| POSSIBLE CAUSE |
- HO2S connector or terminal malfunction
- PCM connector or terminal malfunction
- Short circuit in HO2S circuit each other
- Short to power supply in wiring harness between HO2S terminal A and PCM terminal 2Q
- HO2S malfunction
- PCM malfunction
|
 Courtesy of MAZDA MOTORS CORP.
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