Mazda Mazda6 Workshop Manual Supplement page 374

NO.23 A/C DOES NOT WORK SUFFICIENTLY
23 A/C DOES NOT WORK SUFFICIENTLY
• A/C compressor magnetic clutch does not engage when A/C switch is turned on.
DESCRIPTION
• Improper refrigerant charge amount
• Open A/C switch magnetic clutch
• Open circuit between A/C relay and A/C magnetic clutch
• Poor GND of A/C magnetic clutch
POSSIBLE
• Improper A/C magnetic clutch clearance
CAUSE
• Refrigerant pressure switch is stuck open
• A/C relay is stuck open
• Improper A/C cut-off control
• Open circuit between A/C switch and PCM through both refrigerant pressure switch and A/C amplifier
Diagnostic Procedure
STEP
1 Perform self-test function using WDS or
equivalent.
Turn engine switch to ON.
Retrieve any DTC.
Is DTC displayed?
2 Disconnect A/C compressor connector.
Start engine and turn A/C switch to ON.
Is there correct voltage at terminal of A/C
compressor magnetic clutch connector?
Specification
More than 10.5 V
3 Disconnect refrigerant pressure switch
connector.
Connect jumper wire between terminals of
refrigerant pressure switch connector.
Turn engine switch to ON.
Turn A/C switch on and set blower fan at any
speed.
Measure PCM terminal 84 voltage.
Is voltage below 1.0 V?
4 Inspect A/C cut-off operation.
Does A/C cut-off work properly?
5 Remove jumper wire from switch connector.
Reconnect connector to refrigerant pressure
switch.
Start engine and turn A/C switch on.
Does fan operate?
6 Verify test results.
• If okay, return to diagnostic index to service any additional symptoms.
• If malfunction remains, replace PCM. (See
End Of Sie
F2–222
TROUBLESHOOTING
INSPECTION RESULTS
Yes DTC is displayed:
Go to appropriate DTC test.
Communication error message is displayed:
Inspect for following:
• Open circuit between PCM control relay and PCM
terminal 53 or 79
• Open circuit PCM control relay and PCM terminal
69
• PCM control relay stuck open
• Open or poor GND circuit (PCM terminal 65, 85,
103 or 104)
• Poor connection vehicle body GND
Yes No DTC is displayed:
Go to appropriate DTC test.
Yes Inspect for GND condition of magnetic clutch on A/C
compressor.
If GND condition is okay, inspect magnetic clutch coil
for open circuit.
No Go to next step.
Yes Inspect refrigerant pressure switch operation.
If switch is okay, go to next step.
No Inspect for following:
• A/C switch is stuck open
• Open circuit between refrigerant pressure switch
and PCM terminal 84
• Open circuit of blower motor fan switch and
resistor (if blower motor does not operate)
• Evaporator temperature sensor and A/C amplifier
Yes Go to next step.
No Repair or replace malfunctioning part according to A/C
cut-off system inspection results.
Yes Inspect for stuck open A/C relay.
Replace if necessary.
No Inspect following and repair or replace as necessary:
• Refrigerant charging amount
• Seized A/C compressor
F2–64 PCM REMOVAL/INSTALLATION)
A6E408018881225
ACTION