23 A/C Does Not Work Sufficiently [Lf] - Mazda 3 Workshop Manual

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
• 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.
- If vehicle repaired, troubleshooting completed.
- If vehicle not repaired or additional diagnostic information not available, replace the
PCM.
(See PCM REMOVAL/INSTALLATION
NO.23 A/C DOES NOT WORK SUFFICIENTLY [LF]
23
A/C compressor magnetic clutch does not engage when the A/C switch is turned on.
DESCRIPTION
• Improper refrigerant charging amount
• Open circuit A/C magnetic clutch
• Open circuit in wiring harness between A/C relay and A/C magnetic clutch
• Poor GND of A/C magnetic clutch
POSSIBLE
• Refrigerant pressure switch is stuck open.
CAUSE
• A/C relay is stuck open.
• Seized A/C compressor
• Open circuit in wiring harness between A/C switch and PCM through both
refrigerant pressure switch and A/C amplifier
Diagnostic procedure
STEP INSPECTION
Connect the WDS or equivalent to the
DLC-2.
Retrieve any continuous memory, KOEO
1
and KOER DTCs using WDS or
equivalent.
Are there any DTCs displayed?
Disconnect A/C compressor connector.
2
Start engine and turn A/C switch on.
Downloaded from
A/C DOES NOT WORK SUFFICIENTLY.
RESULTS
Yes
No
Yes
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ACTION
DTC is displayed:
Go to appropriate DTC inspection.
(See DTC TABLE [LF].)
No DTC is displayed:
Go to the next step.
Inspect for GND condition of magnetic
clutch on A/C compressor.
• If GND condition is normal, inspect for
open circuit magnetic clutch coil.
- automotive repair manuals website
B3E010318881W25