DTC P2257: Notes
DTC P2257 DETECTION & CONDITION POSSIBLE CAUSES
| DTC P2257 |
AIR pump relay control circuit low |
| DETECTION CONDITION |
- The PCM monitors the AIR pump relay control voltage when the AIR pump is not operating. If the control voltage is less than 5.8 V
, 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 is available.
- The DTC is stored in the PCM memory.
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| POSSIBLE CAUSE |
- AIR pump relay malfunction
- Connector or terminal malfunction
- Open circuit in wiring harness between main relay terminal C and AIR pump relay terminal E
- Short to ground in wiring harness between main relay terminal C and AIR pump relay terminal E
- Open circuit in wiring harness between AIR pump relay terminal A and PCM terminal 4O
- Short to ground in wiring harness between AIR pump relay terminal A and PCM terminal 4O
- PCM malfunction
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 Courtesy of MAZDA MOTORS CORP.
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