NO.19 A/C ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY [WLT-1, WLT-2]
id010396913900
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19
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A/C always ON or A/C compressor runs continuously
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DESCRIPTION
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• The A/C compressor magnetic clutch does not disengage.
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POSSIBLE CAUSE
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• Improper magnetic clutch clearance
• Short to ground circuit between PCM and frost switch
• Short to ground circuit between PCM and A/C relay
• Short to power line between A/C relay and pressure switch
• A/C low/high pressure switch is stuck closed
• A/C relay is stuck closed
• Frost switch is stuck to close
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Diagnostic procedure
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STEP |
INSPECTION |
ACTION |
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1
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• Turn the engine switch on.
• Turn the engine switch off.
• Measure the voltage at the PCM connector terminal G
Specification
More than 2.7 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:
• Short to ground circuit between PCM connector terminal G and frost switch
• Short to ground circuit between frost switch and blower switch connector terminal
Repair or replace as necessary.
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2
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• Start the engine and run it at idle speed.
• Turn the blower switch off.
• Measure the voltage at the terminal for the A/C relay connector terminal C.
Specification
0 V
• Is the voltage correct?
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Yes
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Inspect for magnetic clutch clearance.
Adjust it if necessary.
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No
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Inspect for the following:
• Short to ground circuit between PCM connector terminal L and A/C relay terminal C
• A/C relay is stuck to closed.
• Short to power line between A/C relay connector terminal C and A/C pressure switch
• Short to power line between pressure switch and A/C compressor magnetic clutch connector
Repair or replace if necessary.
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3
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• Verify the test results. If normal, return to the diagnostic index to service any additional symptoms.
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