DTC P0137: Notes
DTC P0137 [L3] DETECTION CONDITIONS AND POSSIBLE CAUSES
| DTC P0137 |
HO2S circuit low input |
| DETECTION CONDITION |
- The PCM monitors input voltage from HO2S. If the input voltage from the HO2S is below -1.15 V
or HO2S bias voltage below 1.3 V for 5 s
while the HO2S is active, the PCM determines that circuit input is low.
Diagnostic support note
- This is a continuous 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 (Mode 2/Mode 12) is available.
- DTC is stored in the PCM memory.
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| POSSIBLE CAUSE |
- HO2S connector or terminal malfunction
- PCM connector or terminal malfunction
- Open circuit in wiring between HO2S terminal A and PCM terminal 2Q
- Short to body ground circuit in wiring between HO2S terminal A and PCM terminal 2Q
- Open circuit in wiring between HO2S terminal B and PCM terminal 2AS
- HO2S malfunction
- PCM malfunction
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 Courtesy of MAZDA MOTORS CORP.
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