Mazda RX-8 Workshop Manual page 631

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2011 - RX-8 - Engine
DTC P2257 [13B-MSP]
DTC P2257 AIR pump relay control circuit low
DETECTION
CONDITION
POSSIBLE
CAUSE
The PCM monitors the AIR pump relay control voltage when the AIR pump is not operating. If
the control voltage is less than the specification, the PCM determines that the AIR pump relay
control circuit voltage is low.
Diagnostic support note
This is a continuous monitor (AIR system).
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.
AIR pump relay terminal malfunction
Short to ground or open circuit in AIR pump relay power supply circuit
Short to ground in wiring harness between main relay terminal C and AIR pump
relay terminal D
AIR pump relay related fuse malfunction
Open circuit in wiring harness between main relay terminal C and AIR pump
relay terminal D
Short to ground in wiring harness between AIR pump relay terminal A and PCM terminal 1G
AIR pump relay malfunction
PCM connector or terminals malfunction
Open circuit in wiring harness between AIR pump relay terminal A and PCM terminal 1G
PCM malfunction