DTC P0480; Pcm Cooling Fan Relay No. 1 Control Circuit Malfunction: Notes
WARNING: This page is about a different car, the 2017 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.
DETECTION CONDITION & POSSIBLE CAUSE
| DTC P0480:00 |
Cooling fan relay No. 1 control circuit malfunction |
| DETECTION CONDITION |
- The cooling fan relay No. 1 control voltage at the PCM terminal 2AU is low or cooling fan relay No. 1 control current is high for a continuous 5 s relative to the PCM control signal.
Diagnostic support note
- This is a continuous monitor (other).
- The check engine light does not illuminate.
- FREEZE FRAME DATA (Mode 2) is not available.
- Snapshot data is available.
- DTC is stored in the PCM memory.
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| FAIL-SAFE FUNCTION |
Not applicable |
| POSSIBLE CAUSE |
- Cooling fan relay No. 1 malfunction
- Short to ground or open circuit in cooling fan relay No. 1 power supply circuit
- Short to ground in wiring harness between ENGINE3 15 A fuse and cooling fan relay No. 1 terminal A
- ENGINE3 15 A fuse malfunction
- Open circuit in wiring harness between main relay terminal D and cooling fan relay No. 1 terminal A
- Short to ground in wiring harness between cooling fan relay No. 1 terminal E and PCM terminal 2AU
- PCM connector or terminals malfunction
- Short to power supply in wiring harness between cooling fan relay No. 1 terminal E and PCM terminal 2AU
- Open circuit in wiring harness between cooling fan relay No. 1 terminal E and PCM terminal 2AU
- PCM malfunction
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