Dtc P0038 [13B-Msp] - Mazda RX-8 Workshop Manual

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2011 - RX-8 - Engine

DTC P0038 [13B-MSP]

DTC P0038 HO2S heater control circuit high input
DETECTION
CONDITION
POSSIBLE
CAUSE
The input voltage to the HO2S heater drive terminal in the PCM is at the set value or more for
0.5 s or more even though the HO2S heater is duty-controlled at 10 % or more by the PCM.
If the current flowing to the HO2S heater circuit in the PCM is high when the HO2S heater is
off, the PCM detects DTC P0038.
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
HO2S heater malfunction
PCM connector or terminals malfunction
Short to power supply in wiring harness between HO2S terminal D and PCM terminal 2BE
PCM malfunction