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NO.23 A/C DOES NOT WORK SUFFICIENTLY [L3 Turbo]

id0103b4802900

23 | A/C DOES NOT WORK SUFFICIENTLY.
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DESCRIPTION | A/C compressor magnetic clutch does not engage when A/C switch is turned on.
POSSIBLE CAUSE | • Improper refrigerant charging amount • Open A/C magnetic clutch • Open circuit between the A/C relay and the A/C magnetic clutch • Poor ground of A/C magnetic clutch • Refrigerant pressure switch is stuck open. • A/C relay is stuck open. • Seized A/C compressor • Open circuit between the A/C switch and the PCM through both the refrigerant pressure switch and the A/C amplifier

Diagnostic procedure

STEP | INSPECTION | RESULTS | ACTION
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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 test.
No | No DTC is displayed: Go to the next step.
2 | Disconnect the A/C compressor connector. Start the engine and turn the A/C switch on. Is there correct voltage at terminal of A/C compressor magnetic clutch connector? Specification 10.5 V or more | Yes | Inspect for the ground condition of magnetic clutch on A/C compressor. If ground condition is normal, inspect for an open circuit magnetic clutch coil.
No | Go to the next step.
3 | Disconnect the refrigerant pressure switch connector. Connect jumper wire between terminals of A/C high-pressure switch connector. Connect jumper wires between terminals of refrigerant pressure switch connector. 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 the 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 between refrigerant pressure switch and PCM terminal 1AC • Open circuit between blower motor fan switch and resistor (if blower motor does not operate) • Evaporator temperature sensor and A/C amplifier
4 | Remove jumper wire from switch connector. Reconnect connector to refrigerant pressure switch. Start engine and turn A/C switch on. Does fan operate? | Yes | Inspect the 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 the diagnostic index to service any additional symptoms. • If a malfunction remains, inspect the related Service Bulletins and/or On-line Repair Information and perform the repair or diagnosis. - If the vehicle is repaired, troubleshooting is completed. - If the vehicle is not repaired or additional diagnostic information is not available, reprogram the PCM if a later calibration is available. Retest.le. Retest.