No. 23 A/C Does Not Work Sufficiently: Notes

23	A/C DOES NOT WORK SUFFICIENTLY
DESCRIPTION	A/C compressor magnetic clutch does not engage when A/C switch is turned on.
Possible cause	PCM, instrument cluster or climate control unit DTC is stored Refrigerant pressure sensor malfunction Improper refrigerant charging amount Seized A/C compressor Evaporator temperature sensor malfunction Open or short circuit in wiring harness between the following terminals: Evaporator temperature sensor terminal B-Climate control unit terminal J Evaporator temperature sensor terminal A-Climate control unit terminal E Instrument cluster malfunction (Does not receive A/C request signal from climate control unit or transmit it to PCM) Climate control unit malfunction (A/C switch malfunction or climate control unit does not determine A/C request or transmit A/C request signal) Open circuit in wiring harness between magnetic clutch and body ground A/C relay stuck open Open circuit in wiring harness between the following terminals: IG1 relay terminal C-A/C relay terminal A Battery positive terminal-A/C relay terminal C A/C relay terminal E-PCM terminal 2AF A/C relay terminal D-Magnetic clutch terminal A

A/C DOES NOT WORK SUFFICIENTLY

DESCRIPTION

Possible cause

PCM, instrument cluster or climate control unit DTC is stored
Refrigerant pressure sensor malfunction
Improper refrigerant charging amount
Seized A/C compressor
Evaporator temperature sensor malfunction
Open or short circuit in wiring harness between the following terminals:
- Evaporator temperature sensor terminal B-Climate control unit terminal J
- Evaporator temperature sensor terminal A-Climate control unit terminal E
Instrument cluster malfunction (Does not receive A/C request signal from climate control unit or transmit it to PCM)
Climate control unit malfunction (A/C switch malfunction or climate control unit does not determine A/C request or transmit A/C request signal)
Open circuit in wiring harness between magnetic clutch and body ground
A/C relay stuck open
Open circuit in wiring harness between the following terminals:
- IG1 relay terminal C-A/C relay terminal A
- Battery positive terminal-A/C relay terminal C
- A/C relay terminal E-PCM terminal 2AF
- A/C relay terminal D-Magnetic clutch terminal A

Fig 1: Evaporator Temperature Sensor And Climate Control Unit - Circuit Diagram

Courtesy of MAZDA MOTORS CORP.

CAUTION:

Verify the malfunction symptom according to not only the PID value but also the symptom troubleshooting.