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DTC P0645:00: Notes

WARNING: This page is about a different variant/trim than selected.
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).
POSSIBLE CAUSE 
  • Connector or terminal malfunction
  • Open circuit in wiring between ignition switch(1)/relay block(2) and A/C relay terminal E
  • Short to power supply between A/C relay terminal A and PCM terminal 1W
  • Short to ground in wiring between A/C relay terminal A and PCM terminal 1W
  • Open circuit in wiring between A/C relay terminal A and PCM terminal 1W
  • A/C relay malfunction
  • PCM malfunction
G08140168Courtesy of MAZDA MOTORS CORP.
(1) Vehicles without advanced keyless entry and push button start system 
(2) Vehicles with advanced keyless entry and push button start system 
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