Dtc P0037 [13B-Msp] - Mazda RX-8 Workshop Manual

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2011 - RX-8 - Engine

DTC P0037 [13B-MSP]

DTC P0037 HO2S heater control circuit low input
DETECTION
CONDITION
POSSIBLE
CAUSE
The input voltage to the HO2S heater drive terminal in the PCM is at the set value or less for
0.5 s or more even though the HO2S heater is duty-controlled at under 90 % by the PCM.
Diagnostic support note
This is a continuous monitor (A/F sensor heater, 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 (Mode 2/Mode 12) is available.
The DTC is stored in the PCM memory.
HO2S connector or terminals malfunction
Short to ground or open circuit in HO2S heater power supply circuit
Short to ground in wiring harness between main relay terminal C and HO2S
terminal C
HO2S heater related fuse malfunction
Open circuit in wiring harness between main relay terminal C and HO2S
terminal C
HO2S heater malfunction
Short to ground in wiring harness between HO2S terminal D and PCM terminal 2BE
PCM connector or terminals malfunction
Open circuit in wiring harness between HO2S terminal D and PCM terminal 2BE
PCM malfunction