DTC P0038: Notes
DETECTION CONDITION AND POSSIBLE CAUSE (DTC P0038)
| DTC P0038 |
Rear HO2S heater circuit high input |
| DETECTION CONDITION |
- The PCM monitors the rear HO2S heater control voltage when the PCM turns the rear HO2S heater on. If the control voltage is less than 57%
of the battery voltage, the PCM determines that the rear HO2S heater control circuit voltage is high.
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
- Open circuit in wiring harness between ignition relay and rear HO2S terminal C
- Short to ground in wiring harness between ignition relay and rear HO2S terminal C
- Open circuit in wiring harness between rear HO2S terminal D and PCM terminal 2BE
- Short to ground 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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