DTC P0481: Notes
DTC P0481 DETECTION & CONDITION POSSIBLE CAUSES
| DTC P0481 |
Cooling fan No.2 control circuit problem |
| DETECTION CONDITION |
- The PCM monitors the cooling fan relay No.2 control voltage when the PCM turns the cooling fan relay No.2 off. If the control voltage is low, the PCM determines that the cooling fan No.2 control circuit voltage is low.
- The PCM monitors the cooling fan relay No.2 control voltage when the PCM turns the cooling fan relay No.2 on. If the control voltage is high, the PCM determines that the cooling fan No.2 control circuit voltage is high.
Diagnostic support note
- This is a continuous monitor (Other).
- The MIL does not illuminate.
- 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 |
- Cooling fan relay No.2/No.3 malfunction
- Connector or terminal malfunction
- Open circuit in wiring harness between main relay terminal C and cooling fan relay No.2 terminal A
- Short to ground in wiring harness between main relay terminal C and cooling fan relay No.2 terminal A
- Open circuit in wiring harness between main relay terminal C and cooling fan relay No.3 terminal A
- Short to ground in wiring harness between main relay terminal C and cooling fan relay No.3 terminal A
- Open circuit in wiring harness between cooling fan relay No.2 terminal E and PCM terminal 5AD
- Short to power supply in wiring harness between cooling fan relay No.2 terminal E and PCM terminal 5AD
- Short to ground in wiring harness between cooling fan relay No.2 terminal E and PCM terminal 5AD
- Open circuit in wiring harness between cooling fan relay No.3 terminal E and PCM terminal 5AD
- Short to power supply in wiring harness between cooling fan relay No.3 terminal E and PCM terminal 5AD
- Short to ground in wiring harness between cooling fan relay No.3 terminal E and PCM terminal 5AD
- PCM malfunction
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 Courtesy of MAZDA MOTORS CORP.
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