Mazda 626 - A;C Does Not Cut off under Wide Open Throttle Conditions

TROUBLESHOOTING
STEP INSPECTION RESULTS
ACTION
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 69 (for GF4A-EL models) or 96
(except for GF4A-EL models)
If both items okay, go to next step.
No
Inspect if circuit between A/C relay and
magnetic clutch is shorted to battery power
circuit.
If circuit is okay, inspect magnetic clutch stuck
engagement or clearance.
3
Connect NGS tester to DLC.
Access A/C SW or ACCS PID on NGS tester.
Start the engine and turn A/C switch on.
Read A/C SW or ACCS PID while disconnecting
refrigerant pressure switch connector.
Note
• A/C SW or ACCS PID should read OFF when
disconnecting connector. IfA/CSWPID
reading remains ON, short to GND circuit may
be present.
Does A/C SW or ACCS PID reading remain ON?
Yes
Inspect for short to GND circuit between
refrigerant pressure switch and PCM terminal
41.
No Go to next step.
4 Reconnect refrigerant pressure switch connector.
Read A/C SW PID while turning off A/C switch.
Note
• A/C SW PID should read off when turning A/C
switch off. If A/C SW PID reading remains on,
short to GND circuit may be present.
Does A/C SW PID reading remain on?
Yes
Inspect for 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.
NO.24 A/C DOES NOT CUT OFF UNDER WIDE OPEN THROTTLE CONDITIONS.
24
A/C does not cut off under wide open throttle conditions.
DESCRIPTION • A/C compressor magnetic clutch does not disengage under WOT.
POSSIBLE
CAUSE
• TP sensor malfunction
• TP sensor misadjustment
• TP sensor is loosely installed.
Diagnostic Procedure
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.23 “A/C is
always ON or A/C compressor runs
continuously”.
2 Connect NGS tester to DLC.
Turn ignition switch on.
Retrieve any DTC.
Is any DTC displayed?
Yes DTC is displayed:
Go to appropriate DTC test.
No
No DTC is displayed:
Inspect TP sensor for proper adjustment.
3
Verify test results. If okay, return to diagnostic index to sen/ice any additional symptoms.
F1-140