DTC P0480 [LF]: Notes
DTC P0480 (LF) DETECTION CONDITION AND POSSIBLE CAUSE
| DTC P0480 |
Cooling fan relay No. 1 control circuit malfunction |
| DETECTION CONDITION |
- The PCM monitors the cooling fan relay No. 1 control signal voltage and current. If the following conditions are met, the PCM determines that there is the cooling fan relay No. 1 control circuit problem.
- The PCM turns the cooling fan relay No. 1 off, but the voltage of the cooling fan relay No. 1 control signal remains low.
- The PCM turns the cooling fan relay No. 1 on, but the current of the cooling fan relay No. 1 control signal remains high.
Diagnostic support note
- This is a continuous monitor (other).
- The MIL does not illuminate.
- FREEZE FRAME DATA (Mode 2/Mode 12) is available.
- The DTC is stored in the PCM memory.
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| POSSIBLE CAUSE |
- Open circuit or short to ground in cooling fan relay No. 1 power supply circuit
- Short to ground in wiring harness between battery positive terminal and cooling fan relay No. 1 terminal E
- Cooling fan relay No. 1 power supply circuit related fuse malfunction
- Open circuit in wiring harness between battery positive terminal and cooling fan relay No. 1 terminal E
- Cooling fan relay No. 1 malfunction
- Short to ground in wiring harness between cooling fan relay No. 1 terminal A and PCM terminal 1M
- PCM connector or terminals malfunction
- Short to power supply in wiring harness between cooling fan relay No. 1 terminal A and PCM terminal 1M
- Open circuit in wiring harness between cooling fan relay No. 1 terminal A and PCM terminal 1M
- PCM malfunction
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 Courtesy of MAZDA MOTORS CORP.
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