24 A/C Is Always On Or A/C Compressor Runs Continuously [Z6] - Mazda 3 Workshop Manual

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
Access AC_REQ PID.
Turn the ignition switch to the ON
position position.
Turn the A/C switch on and set the
blower fan at any speed.
Does AC_REQ PID read On?
Remove jumper wire from the switch
connector.
Reconnect connector to the refrigerant
pressure switch.
4
Start the engine and turn the A/C switch
on.
Does the fan operate?
Verify test results.
• If normal, return to diagnostic index to service any additional symptoms.
(See ENGINE SYMPTOM TROUBLESHOOTING
• If malfunction remains, inspect related Service information perform repair or diagnosis.
5
- If vehicle repaired, troubleshooting completed.
- If vehicle not repaired or additional diagnostic information not available, replace the
PCM.
(See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION
NO.24 A/C IS ALWAYS ON OR A/C COMPRESSOR
24
The A/C compressor magnetic clutch does not disengage.
DESCRIPTION
• Stuck engagement A/C compressor magnetic clutch
• A/C relay is stuck closed.
• Short to GND in wiring harness between A/C switch and PCM
POSSIBLE
CAUSE
• Short to GND in wiring harness between A/C relay and PCM
• Short to battery power in A/C relay to magnetic clutch circuit shorted to battery
power
Diagnostic procedure
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No
RUNS CONTINUOUSLY [Z6]
A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY.
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• Open circuit in wiring harness between
refrigerant pressure switch and PCM
terminal 1Q
• Open circuit of blower motor fan switch
and resistor (if blower motor does not
operate)
• Evaporator temperature sensor and A/C
amplifier
Inspect for stuck open the A/C relay.
Replace if necessary.
Inspect following and repair or replace if
necessary:
• Refrigerant charging amount
• A/C compressor for being seized
[Z6].)
[Z6].)
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B3E010318881W57