No.24 A/C Is Always On Or A/Ccompressor Runs Continuously; No.25 A/C Is Not Cut Off Under Wide Open Throttle Conditions - Mazda 2002 6 Workshop Manual

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NO.24 A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY
24
A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY.
DESCRIPTION
A/C compressor magnetic clutch does not disengage.
• Stuck engagement A/C compressor magnetic clutch
• A/C relay is stuck closed.
• Short to GND between A/C switch and PCM
POSSIBLE CAUSE
• Short to GND circuit between A/C relay and PCM
• A/C relay to magnetic clutch circuit shorted to battery power
Diagnostic procedure
STEP
INSPECTION
1
Connect WDS or equivalent to DLC-2.
Retrieve any continuous memory, KOEO and
KOER DTCs.
Are there any DTCs displayed?
2
Start engine and run it at idle.
Turn A/C switch on.
Remove A/C relay.
Does A/C magnetic clutch disengage?
3
Connect WDS or equivalent to DLC-2.
Access ACSW PID.
Start engine and turn A/C switch on.
Read ACSW PID while disconnecting refrigerant
pressure switch connector.
Note
• ACSW PID should read OFF when
disconnecting connector. If ACSW PID
reading remains ON, short to GND circuit
may be present.
Does ACSW PID reading remain ON?
4
Reconnect refrigerant pressure switch
connector.
Read ACSW PID while turning off A/C switch.
Note
• ACSW PID should read OFF when turning
A/C switch off. If ACSW PID reading
remains ON, short to GND circuit may be
present.
Does ACSW PID reading remain ON?
5
Verify test results.
• If okay, return to diagnostic index to service any additional symptoms.
• If malfunction remains, replace PCM.
End Of Sie

NO.25 A/C IS NOT CUT OFF UNDER WIDE OPEN THROTTLE CONDITIONS

25
A/C IS NOT CUT OFF UNDER WOT CONDITIONS.
DESCRIPTION
A/C compressor magnetic clutch does not disengage under WOT.
• TP sensor malfunction
• TP sensor misadjustment
POSSIBLE CAUSE
• Loosely installed TP sensor.
Diagnostic procedure
STEP
INSPECTION
1
Does A/C compressor disengage when A/C
switch is turned off?
TROUBLESHOOTING
RESULTS
Yes
DTC is displayed:
Go to appropriate DTC test.
No
No DTC is displayed:
Go to next step.
Yes
Inspect for following:
• A/C relay is stuck closed.
• Short to GND circuit between A/C relay and PCM
terminal 4O.
If both items okay, go to next step.
No
Inspect if circuit between A/C relay and magnetic
clutch shorts to battery power circuit.
If circuit is okay, inspect magnetic clutch stuck
engagement or clearance.
Yes
Inspect for short to GND circuit between refrigerant
pressure switch and PCM terminal 1AC.
No
Go to next step.
Yes
Inspect following:
• Short to GND circuit between A/C switch and A/C
amplifier
• Short to GND circuit between A/C amplifier and
refrigerant pressure switch
No
Inspect for stuck closed A/C switch.
RESULTS
Yes
Go to next step.
No
Go to symptom troubleshooting "No.24 A/C is always
on or A/C compressor runs continuously".
A6E398018881W26
ACTION
A6E398018881W27
ACTION
F–221
F

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