Mazda 2002 6 - 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

TROUBLESHOOTING
F–221
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NO.24 A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY
A6E398018881W26
Diagnostic procedure
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NO.25 A/C IS NOT CUT OFF UNDER WIDE OPEN THROTTLE CONDITIONS
A6E398018881W27
Diagnostic procedure
24 A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY.
DESCRIPTION A/C compressor magnetic clutch does not disengage.
POSSIBLE CAUSE
• Stuck engagement A/C compressor magnetic clutch
• A/C relay is stuck closed.
• Short to GND between A/C switch and PCM
• Short to GND circuit between A/C relay and PCM
• A/C relay to magnetic clutch circuit shorted to battery power
STEP INSPECTION RESULTS ACTION
1 Connect WDS or equivalent to DLC-2.
Retrieve any continuous memory, KOEO and
KOER DTCs.
Are there any DTCs displayed?
Yes DTC is displayed:
Go to appropriate DTC test.
No No DTC is displayed:
Go to next step.
2 Start engine and run it at idle.
Turn A/C switch on.
Remove A/C relay.
Does A/C magnetic clutch disengage?
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.
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?
Yes Inspect for short to GND circuit between refrigerant
pressure switch and PCM terminal 1AC.
No Go to next step.
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?
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.
5 Verify test results.
• If okay, return to diagnostic index to service any additional symptoms.
• If malfunction remains, replace PCM.
25 A/C IS NOT CUT OFF UNDER WOT CONDITIONS.
DESCRIPTION A/C compressor magnetic clutch does not disengage under WOT.
POSSIBLE CAUSE
• TP sensor malfunction
• TP sensor misadjustment
• Loosely installed TP sensor.
STEP INSPECTION RESULTS ACTION
1 Does A/C compressor disengage when A/C
switch is turned off?
Yes Go to next step.
No Go to symptom troubleshooting "No.24 A/C is always
on or A/C compressor runs continuously".