DTC P0037: Notes
DETECTION CONDITION AND POSSIBLE CAUSE (DTC P0037)
| DTC P0037 |
Rear HO2S heater circuit low input |
| DETECTION CONDITION |
- The PCM monitors the rear HO2S heater control voltage when the PCM turns the rear HO2S heater off. If the control voltage exceeds 25%
of the battery voltage, the PCM determines that the rear HO2S heater control circuit voltage is low.
Diagnostic support note
- This is a continuous monitor (HO2S heater).
- 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 the first drive cycle.
- FREEZE FRAME DATA is available.
- The DTC is stored in the PCM memory.
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| POSSIBLE CAUSE |
- Rear HO2S heater malfunction
- Connector or terminal malfunction
- Short to power supply in wiring harness between rear HO2S terminal D and PCM terminal 2BE
- PCM malfunction
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 Courtesy of MAZDA MOTORS CORP.
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