Dtc P0031 [13B-Msp] - Mazda RX-8 Workshop Manual

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2011 - RX-8 - Engine

DTC P0031 [13B-MSP]

DTC P0031 A/F sensor heater control circuit low input
DETECTION
CONDITION
POSSIBLE
CAUSE
The input voltage to the A/F sensor heater drive terminal in the PCM is at the set value or less
for 1 s or more even though the A/F sensor 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.
A/F sensor connector or terminals malfunction
Short to ground or open circuit in A/F sensor heater power supply circuit
Short to ground in wiring harness between main relay terminal C and A/F
sensor terminal C
A/F sensor heater related fuse malfunction
Open circuit in wiring harness between main relay terminal C and A/F sensor
terminal C
A/F sensor heater malfunction
Short to ground in wiring harness between A/F sensor terminal D and PCM terminal 2BG
PCM connector or terminals malfunction
Open circuit in wiring harness between A/F sensor terminal D and PCM terminal 2BG
PCM malfunction