DTC P0037: Notes
DTC P0037 [L3] DETECTION CONDITIONS AND POSSIBLE CAUSES
| DTC P0037 |
HO2S heater circuit low input |
| DETECTION CONDITION |
- The PCM monitors the HO2S heater output voltage. If the PCM turns the HO2S heater off but the HO2S heater circuit remains low voltage, the PCM determines that the HO2S heater circuit has a malfunction.
Diagnostic support note
- This is a continuous monitor (HO2S heater).
- 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.
- The DTC is stored in the PCM memory.
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| POSSIBLE CAUSE |
- HO2S connector or terminal malfunction
- HO2S heater malfunction
- Open circuit in the wiring harness between the ignition switch and HO2S terminal C
- PCM connector or terminal malfunction
- Open circuit in the wiring harness between HO2S terminal D and PCM terminal 2B
- Short to ground in the wiring harness between HO2S terminal D and PCM terminal 2B
- Poor connection at the HO2S or the PCM connector
- PCM malfunction
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 Courtesy of MAZDA MOTORS CORP.
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