A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY [SKYACTIV-G]
A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY [SKYACTIV-G]
SM2334625
id0103s4891100
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Troubleshooting item |
A/C is always on or A/C compressor runs continuously |
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Description
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• A/C compressor magnetic clutch does not disengage.
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Possible cause
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• PCM, body control module (BCM) or dash-electrical supply unit DTC is stored
• Short to power supply in magnetic clutch power supply circuit
• Magnetic clutch engagement is stuck
• Climate control unit malfunction (Climate control unit always transmits A/C request signal)
• A/C relay is stuck closed
• Short to ground in A/C relay control circuit
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Diagnostic Procedure
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Step |
Inspection |
Results |
Action |
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1
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VERIFY PCM DTC
• Perform the DTC inspection for the PCM. (See DTC INSPECTION.)
• Are any DTCs displayed?
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Yes
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Repair the malfunctioning location according to the applicable DTC troubleshooting.
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No
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Go to the next step.
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2
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VERIFY BODY CONTROL MODULE (BCM) DTC
• Perform the DTC inspection for the body control module (BCM). (See DTC INSPECTION.)
• Are any DTCs displayed?
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Yes
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Repair the malfunctioning location according to the applicable DTC troubleshooting.
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No
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Go to the next step.
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3
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VERIFY DASH-ELECTRICAL SUPPLY UNIT DTC
• Perform the DTC inspection for the dash-electrical supply unit. (See DTC INSPECTION.)
• Are any DTCs displayed?
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Yes
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Repair the malfunctioning location according to the applicable DTC troubleshooting.
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No
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Go to the next step.
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4
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DETERMINE IF MALFUNCTION CAUSE IS MAGNETIC CLUTCH OR OTHER
• Start the engine and idle it.
• Turn the A/C switch on.
• Remove the A/C relay. (See RELAY LOCATION [(US)].)
• Does the magnetic clutch disengage?
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Yes
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Go to Step 8.
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No
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Go to the next step.
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5
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INSPECT IF MALFUNCTION CAUSE IS MAGNETIC CLUTCH POWER SUPPLY CIRCUIT OR MAGNETIC CLUTCH
• A/C relay is removed.
• Switch the ignition off.
• Disconnect the magnetic clutch connector.
• Start the engine and idle it.
• Does the magnetic clutch disengage?
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Yes
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Go to the next step.
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No
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Go to Step 7.
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6
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INSPECT MAGNETIC CLUTCH POWER SUPPLY CIRCUIT FOR SHORT TO POWER SUPPLY
• Inspect the applicable circuit for a short to power supply. (See CIRCUIT INSPECTION.)
• Is the circuit normal?
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Yes
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Go to repair completion verification.
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No
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Repair or replace the malfunctioning location and perform the repair completion verification.
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7
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INSPECT MAGNETIC CLUTCH CLEARANCE
• Verify the magnetic clutch clearance. (See MAGNETIC CLUTCH ADJUSTMENT [SKYACTIV-G 2.0, SKYACTIV-G 2.5].)
• Is the magnetic clutch clearance normal?
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Yes
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Inspect the magnetic clutch to see if it is stuck.
• If there is any malfunction:
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No
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Adjust the magnetic clutch clearance and perform the repair completion verification.
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8
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DETERMINE IF MALFUNCTION CAUSE IS A/C RELAY CONTROL SIGNAL OR A/C REQUEST SIGNAL
• Access the PCM PID A/C_SW using the M-MDS. (See PID/DATA MONITOR INSPECTION.)
• Monitor the PID A/C_SW while turning on and off the air conditioner using the switch on the control panel.
• Is the A/C_SW PID value always ON?
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Yes
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Climate control unit always transmits A/C request signal.
• Replace the climate control unit and perform the repair completion verification. (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER (US)].) (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [MANUAL AIR CONDITIONER (US)].)
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No
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Go to the next step.
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9
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INSPECT A/C RELAY FOR MALFUNCTION
• Inspect the applicable part. (See RELAY INSPECTION.)
• Is the part normal?
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Yes
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Go to the next step.
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No
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Repair or replace the malfunctioning location and perform the repair completion verification.
(See RELAY LOCATION [(US)].)
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10
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INSPECT A/C RELAY CONTROL CIRCUIT FOR SHORT TO GROUND
• Inspect the applicable circuit for a short to ground. (See CIRCUIT INSPECTION.)
• Is the circuit normal?
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Yes
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Go to the next step.
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No
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Repair or replace the malfunctioning location and perform the repair completion verification.
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Repair completion verification 1
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VERIFY THAT VEHICLE IS REPAIRED
• Install/connect the part removed/disconnected during the troubleshooting procedure.
• Has the malfunction symptom been eliminated?
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Yes
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Complete the symptom troubleshooting. (Explain contents of repair to customer)
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No
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Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.
• If the CAN communication is normal, perform the diagnosis from Step 1.
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Repair completion verification 2
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VERIFY IF MALFUNCTION IS CAUSED BY NOT PERFORMING PCM REPROGRAMMING
• Verify repair information and verify that there is a new calibration in the PCM.
• Is there a new calibration in the PCM?
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Yes
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Perform the PCM reprogramming and verify if the malfunction symptom was corrected.
• If the malfunction recurs, replace the PCM. (See PCM REMOVAL/INSTALLATION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].) (See PCM REMOVAL/INSTALLATION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
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No
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Replace the PCM.
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