DTC P0645:00 [MZI-3.7]: Notes
WARNING: This page is about a different car, the 2009 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
DETECTION CONDITION & POSSIBLE CAUSE
| DTC P0645:00 |
A/C relay control circuit |
| DETECTION CONDITION |
- Monitors the A/C relay control circuit output from the PCM. The test fails when the PCM grounds the A/C relay control circuit, excessive current draw is detected on the A/C relay control circuit; or, with the A/C relay control circuit not grounded by the PCM, voltage is not detected on the A/C relay control circuit (the PCM expects to detect vehicle power voltage coming through the A/C relay coil to the A/C circuit).
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| POSSIBLE CAUSE |
- Open circuit in wiring between main relay terminal D and A/C relay terminal A
- Short to power supply between A/C relay terminal E and PCM terminal 1N
- Short to ground in wiring between A/C relay terminal E and PCM terminal 1N
- Connector or terminal malfunction
- Open circuit in wiring between A/C relay terminal E and PCM terminal 1N
- A/C relay malfunction
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 Courtesy of MAZDA MOTORS CORP.
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