NO.23 A/C DOES NOT WORK SUFFICIENTLY[LF, L3]
id0103b2802900
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23 |
A/C DOES NOT WORK SUFFICIENTLY. |
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DESCRIPTION
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A/C compressor magnetic clutch does not engage when the A/C switch is turned on.
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POSSIBLE CAUSE
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• Improper refrigerant charging amount
• Open circuit 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
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Diagnostic procedure
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STEP |
INSPECTION |
RESULTS |
ACTION |
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1
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Connect the M-MDS to the DLC-2.
Retrieve any continuous memory, KOEO and KOER DTCs using M-MDS.
Are there any DTCs displayed?
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Yes
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DTC is displayed:
Go to appropriate DTC inspection.
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No
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No DTC is displayed:
Go to the next step.
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2
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Disconnect A/C compressor connector.
Start engine and turn A/C switch on.
Is there correct voltage A/C compressor magnetic clutch terminal?
Specification
More than 10.5 V
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Yes
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Inspect for GND condition of magnetic clutch on A/C compressor.
• If GND condition is normal, inspect for open circuit magnetic clutch coil.
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No
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Go to the next step.
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3
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Disconnect the refrigerant pressure switch connector.
Connect jumper wire between A/C high-pressure switch terminal.
Connect jumper wires between refrigerant pressure switch terminal.
Connect the M-MDS to the DLC-2.
Access AC_REQ PID.
Turn the ignition switch to the ON position.
Turn A/C switch on and set blower fan at any speed.
Does AC_REQ PID read On?
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Yes
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Inspect refrigerant pressure switch operation.
• If switch is normal, go to the next step.
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No
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Inspect for following:
• A/C switch is stuck open.
• Open circuit in wiring harness between refrigerant pressure switch and PCM terminal 1AU*1, 1AP*2
• Open circuit of blower motor fan switch and resistor (if blower motor does not operate)
• Evaporator temperature sensor and A/C amplifier
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4
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Remove jumper wire from the switch connector.
Reconnect connector to refrigerant pressure switch.
Start the engine and turn the A/C switch on.
Does the fan operate?
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Yes
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Inspect for stuck open A/C relay.
Replace if necessary.
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No
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Inspect following and repair or replace if necessary:
• Refrigerant charging amount
• A/C compressor for being seized
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5
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Verify test results.
• If normal, return to diagnostic index to service any additional symptoms.
• If malfunction remains, inspect related Service information perform repair or diagnosis.
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