NO.23 A/C DOES NOT WORK SUFFICIENTLY [L8, LF, L5]
id010346802900
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 the A/C magnetic clutch
• Open circuit in wiring harness between A/C relay and 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 in wiring harness between A/C switch and PCM through both refrigerant pressure switch and A/C amplifier
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Diagnostic procedure
STEP |
INSPECTION |
RESULTS |
ACTION |
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1
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Connect the M-MDS to the DLC-2.
Switch the ignition to ON (Engine off).
Retrieve any DTCs.
Are there any DTCs displayed?
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Yes
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DTC is displayed:
Go to the appropriate DTC inspection.
(See DTC TABLE [L8, LF, L5].)
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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 the engine and turn the A/C switch on.
Is there correct voltage at the A/C compressor magnetic clutch terminal?
Specification
10.5 V or more
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Yes
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Inspect the ground condition of magnetic clutch on A/C compressor.
If the ground condition is normal, inspect for an open circuit in the 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 a jumper wire between the A/C high pressure switch terminal.
Connect a jumper wire between the refrigerant pressure switch terminal.
Switch the ignition to ON.
Turn the A/C switch on and the set blower fan to any speed.
Does the A/C work?
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Yes
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Inspect the refrigerant pressure switch operation.
If the switch is normal, go to the next step.
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No
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Inspect the following:
• A/C switch is stuck open.
• Open circuit in the wiring harness between the refrigerant pressure switch and PCM terminal 1AW
• Open circuit in the wiring harness between the blower motor fan switch and the 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 the connector to the 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 whether A/C relay is stuck open.
Replace if necessary.
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No
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Inspect the following and repair or replace if necessary:
• Refrigerant charging amount
• A/C compressor for seizure
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5
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• Verify test results.
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