DTC P0038: Notes
DTC P0038 DETECTION CONDITION AND POSSIBLE CAUSES
| DTC P0038 |
Rear HO2S heater circuit high Input |
| DETECTION CONDITION |
- The PCM monitors the rear HO2S heater output voltage, If the PCM turns the rear HO2S heater off but the rear HO2S heater circuit voltage remains high the PCM determines that the rear HO2S heater circuit has a malfunction.
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.
- DTCs are stored in the PCM memory.
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| POSSIBLE CAUSE |
- Rear HO2S heater malfunction
- Connector or terminal malfunction
- Short to power supply in the wiring harness between rear HO2S terminal D and PCM terminal 4Z
- PCM malfunction
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 Courtesy of MAZDA MOTORS CORP.
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