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 NO.23 A/C DOES NOT WORK SUFFICIENTLY [L8, LF, L3]

NO.23 A/C DOES NOT WORK SUFFICIENTLY [L8, LF, L3]

id0103a1802900

23

A/C DOES NOT WORK SUFFICIENTLY.

DESCRIPTION

A/C compressor magnetic clutch does not engage when the A/C switch is turned on.

POSSIBLE CAUSE

• Improper refrigerant charging amount
• Open the 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
• Refrigerant pressure switch is stuck open.
• 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

RESULTS

ACTION

1
Connect the WDS or equivalent to the DLC-2.
Turn the ignition switch to the ON position (Engine off).
Retrieve any DTCs.
Are there any DTCs displayed?
Yes

DTC is displayed:

Go to the appropriate DTC inspection.
No

No DTC is displayed:

Go to the next step.
2
Disconnect A/C compressor connector.
Start engine and turn A/C switch on.
Is there correct voltage at A/C compressor magnetic clutch terminal?
Specification

10.5 V or more

Yes
Inspect for GND condition of magnetic clutch on A/C compressor.
If GND condition is normal, inspect for open circuit magnetic clutch coil.
No
Go to the next step.
3
Disconnect refrigerant pressure switch connector.
Connect jumper wiring between A/C high pressure switch terminal.
Connect jumper wiring between refrigerant pressure switch terminal.
Turn the ignition switch to the ON position.
Turn A/C switch on and set blower fan to any speed.
Does A/C work?
Yes
Inspect refrigerant pressure switch operation.
If switch is normal, go to the next step.
No
Inspect for the following:
• A/C switch is stuck open.
• Open circuit in wiring harness between refrigerant pressure switch and PCM terminal 1AU
• Open circuit in wiring harness between blower motor fan switch and resistor (if blower motor does not operate)
• Evaporator temperature sensor and A/C amplifier
4
Remove jumper wiring from the switch connector.
Reconnect connector to refrigerant pressure switch.
Start the engine and turn the A/C switch on.
Does the fan operate?
Yes
Inspect whether A/C relay is stuck open.
Replace if necessary.
No
Inspect the following and repair or replace if necessary:
• Refrigerant charging amount
• A/C compressor for seizure
5
• Verify test results.
- If normal, return to diagnostic index to service any additional symptoms.
(See ENGINE SYMPTOM TROUBLESHOOTING [L8, LF, L3].)
- If malfunction remains, inspect related Service Information and perform repair or diagnosis.
• If vehicle is repaired, troubleshooting completed.
• If vehicle is not repaired or additional diagnostic information is not available, replace the PCM.
(See PCM REMOVAL/INSTALLATION [L8, LF, L3].)