NO.18 A/C DOES NOT WORK SUFFICIENTLY [WL-3]
id0103b5913800
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18
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A/C does not work sufficiently.
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DESCRIPTION
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• The 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 A/C magnetic clutch
• Open circuit in related wiring harnesses
• Poor ground of A/C magnetic clutch
• A/C low/high pressure switch is stuck open.
• A/C relay is stuck open.
• Seized A/C compressor
• ECT sensor malfunction
• Improper magnetic clutch clearance
• APP sensor malfunction
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Diagnostic procedure
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STEP |
INSPECTION |
ACTION |
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1
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• Connect the M-MDS to the DLC.
• Turn the engine switch to the ON position (Engine off).
• Retrieve any DTCs.
• Is a DTC displayed?
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Yes
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DTC is displayed:
• Go to the appropriate DTC test.
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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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• Turn the engine switch to the ON position (Engine off).
• Set the fan switch to 1st, 2nd, 3rd, or 4th position.
• Verify that the blower motor is operating.
• Is the blower motor normal?
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Yes
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Go to the next step.
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No
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Inspect for the following:
• Poor ground of fan switch
• Open circuit in blower resistor
• Poor contact of fan switch
• Blower relay is stuck open
• Open circuit in blower relay coil
• Seized blower motor
• Open circuit in blower motor coil
• Open circuit between blower motor and resistor
• Open circuit between fan switch and resistor
Repair or replace if necessary.
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3
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• Connect the M-MDS to the DTC.
• Access the ACSW PID.
• Turn the engine switch to the ON position (Engine off).
• Set the fan switch to 1st, 2nd, 3rd, or 4th position.
• Turn the A/C switch to the on.
• Does the ACSW PID read ON?
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Yes
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Go to the next step.
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No
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Inspect for the following:
• Fan switch is stuck open.
• Poor contact of microswitch in heater control unit
• Open circuit between PCM connector terminal 3C and fat switch connector terminal
• Open circuit between fan switch connector terminal and fan switch connector terminal
Repair or replace if necessary.
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4
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• Start the engine and run it at idle speed.
• Set the fan switch to the 1st position.
• Measure the voltage at the terminal from the A/C relay connector terminal E.
Specification
More than 10.5 V
• Is the voltage correct?
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Yes
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Go to the next step.
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No
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Inspect for the following:
• Open circuit A/C relay coil
• Poor connect in A/C relay
• A/C relay stuck open
• Open circuit between PCM connector terminal 4L and A/C relay connector terminal
• Open circuit in battery supply line
• Open circuit between engine switch and A/C relay connector terminal
• Engine coolant temperature sensor malfunction
Repair or replace if necessary.
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5
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• Disconnect the A/C magnetic clutch connector.
• Measure the A/C magnetic clutch connector terminal voltage.
Specification
More than 10.5 V
• Is the voltage correct?
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Yes
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Inspect for the following:
• Poor ground of the A/C magnetic clutch
• Open circuit in the magnetic clutch coil
• Refrigerant charging amount
Repair or replace if necessary.
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No
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Inspect for the following:
• Open circuit between the pressure switch connector terminal and A/C magnetic clutch connector terminal
• Refrigerant changing amount
• A/C pressure switch is stuck open.
• Magnetic clutch clearance
• A/C compressor is seized
Repair or replace if necessary.
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6
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• Verify the test results. If normal, return to the diagnostic index to service any additional symptoms.
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