Mazda 3 Workshop Manual page 513

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
23
The A/C compressor magnetic clutch does not engage when the A/C switch is
DESCRIPTION
turned on.
• Improper refrigerant charging amount
• Open 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 the A/C compressor
connector.
Start the engine and turn the A/C switch
on.
2
Is there correct voltage at the A/C
compressor magnetic clutch terminal?
Specification
0.5-1.5 mm {0.02-0.05 in}
Disconnect the refrigerant pressure
switch connector.
Connect jumper wire between A/C high-
pressure switch terminals.
3
Connect jumper wires between
refrigerant pressure switch terminals.
Connect WDS or equivalent to DLC-2.
Downloaded from
A/C DOES NOT WORK SUFFICIENTLY.
RESULTS
Yes
No
Yes
No
Yes
No
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ACTION
DTC is displayed:
Go to the appropriate DTC inspection.
(See DTC TABLE [Z6].)
No DTC is displayed:
Go to the next step.
Inspect for GND condition of the magnetic
clutch on the A/C compressor.
• If GND condition is normal, inspect for
open circuit magnetic clutch coil.
Go to the next step.
Inspect the refrigerant pressure switch
operation.
• If the switch is normal, go to the next
step.
Inspect for following:
• A/C switch is stuck open.
- automotive repair manuals website
B3E010318881W56