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

BME010300103261

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 the WDS or equivalent to the DLC-2. Retrieve any continuous memory, KOEO and KOER DTCs. Are there any DTCs displayed? | Yes | DTC is displayed: Go to the applicable DTC inspection. (See DTC TABLE [L3].)
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 the A/C compressor magnetic clutch connector? Specification More than 10.5 V | Yes | Inspect for GND condition of the magnetic clutch on the A/C compressor. If GND condition is normal, inspect for open circuit of the magnetic clutch coil.
No | Go to the next step.
3 | Disconnect the refrigerant pressure switch connector. Connect a jumper wire between terminals of the A/C high-pressure switch connector. Connect a jumper wires between terminals of the refrigerant pressure switch connector. Connect the WDS or equivalent to the DLC-2.
Access AC_REQ PID.
Turn the ignition switch to the ON position.
Turn the A/C switch on and set the blower fan at any speed.
Does AC_REQ PID read ON?
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 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 a jumper wire from the switch connector. Reconnect connector to the refrigerant pressure switch. Start the engine and turn the A/C switch on. Does the fan operate? | Yes | Inspect for stuck open A/C relay. Replace if necessary.
No | Inspect the following and repair or replace if necessary: • Refrigerant charging amount • A/C compressor for being seized
5 | Verify test results. • If normal, return to diagnostic index to service any additional symptoms. • If malfunction remains, replace PCM.