Dtc P0037 [Z6] - Mazda 3 Workshop Manual

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
DTC P0037
DETECTION
CONDITION
POSSIBLE CAUSE
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DTC P0037 [Z6]

Rear HO2S heater control circuit low
• The PCM monitors the rear HO2S heater control voltage at PCM terminal
2AT. If the PCM turns the rear HO2S heater off but the rear HO2S heater
circuit has low voltage, 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.
• The DTC is stored in the PCM memory.
• Rear HO2S heater malfunction
• Open circuit in wiring harness between rear HO2S terminal C and PCM
terminal 2T
• Open circuit in wiring harness between rear HO2S terminal D and PCM
terminal 2AT
• Short to GND in wiring harness between rear HO2S terminal D and PCM
terminal 2AT
• Connector or terminal malfunction
• PCM malfunction
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