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

BME010300000W25

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 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 between A/C switch and PCM through both refrigerant pressure switch and A/C amplifier

Diagnostic procedure

STEP | INSPECTION | RESULTS | ACTION
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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 | Disconnect A/C compressor connector. Start engine and turn A/C switch on. Is there correct voltage at terminal of A/C compressor magnetic clutch connector? Specification More than 10.5 V | Yes | Inspect for GND condition of magnetic clutch on A/C compressor. If GND condition is okay, inspect for open circuit magnetic clutch coil.
No | Go to next step.
3 | Disconnect 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. Connect WDS or equivalent to DLC-2. Access ACSW PID.
Turn ignition switch to ON position.
Turn A/C switch on and set blower fan at any speed.
Does ACSW PID read ON?
Yes
Inspect refrigerant pressure switch operation.
If switch is okay, go to next step.
No | Inspect for following: • A/C switch is stuck open. • Open circuit between refrigerant pressure switch and PCM terminal 1AC • Open circuit of 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 for stuck open A/C relay. Replace if necessary.
No | Inspect following and repair or replace as necessary: • Refrigerant charging amount • A/C compressor for being seized
5 | Verify test results. • If okay, return to diagnostic index to service any additional symptoms. • If malfunction remains, replace PCM.