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STEP
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INSPECTION
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RESULTS
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ACTION
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1
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• Inspect following:
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- Engine coolant level
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- Coolant leakage
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- Water and anti-freeze mixture
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- Radiator condition
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- Collapsed or restricted radiator hoses
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- Radiator pressure cap
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- Overflow system
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- Fan rotational direction
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- Fuses
• Are all items okay?
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Yes
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Go to the next step.
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No
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Service as necessary.
Repeat Step 1.
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2
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• Connect WDS or equivalent to DLC-2.
• Turn key to ON (Engine OFF).
• Retrieve any DTCs.
• Is "PASSED" displayed?
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Yes
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No DTC is displayed:
• Go to the next step.
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No
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DTC is displayed:
• Go to appropriate DTC test.
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3
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• Start engine and run it at idle speed.
• Turn A/C switch on.
• Does A/C compressor engage?
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Yes
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Go to step 5.
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No
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Inspect following and repair or replace as necessary:
• Refrigerant charging amount
• Open circuit between A/C relay and PCM terminal 69
• Seized A/C magnetic clutch
• A/C magnetic clutch malfunction
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- If all items are okay, Inspect following:
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• Refrigerant pressure switch operation
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• Evaporator temperature sensor and A/C amplifier
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• A/C switch is stuck open.
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• Open or short circuit between refrigerant pressure switch and PCM terminal 41 (R.H.D.)/C-15 (L.H.D.)
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• Open circuit of blower motor fan switch and resistor (if blower motor does not operate)
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4
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• Start engine and run it at idle speed.
• Turn A/C switch ON.
• Do cooling fan and condenser fan operate?
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Yes
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Go to the next step.
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No
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Cooling fan motor does not operate:
• Inspect for following:
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- Cooling fan motor malfunction
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- Cooling fan motor GND open
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- Open circuit between cooling fan motor and fan control module
Condenser fan motor does not operate:
• Inspect for following:
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- Condenser fan motor malfunction
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- Condenser fan motor GND open
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- Open circuit between condenser fan motor and fan control module
Both cooling fan and condenser fan do not operate:
• Inspect for following:
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- Fan control module malfunction
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- Fan control module GND open
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- Open circuit between fan control module and cooling fan relay
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5
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• Is drive belt okay?
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Yes
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Go to the next step.
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No
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Replace drive belt.
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6
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• Is there any leakage around heater unit in passenger compartment?
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Yes
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Inspect and service heater for leakage.
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No
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Go to the next step.
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7
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• Is there any leakage at coolant hoses and/or radiator?
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Yes
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Replace malfunctioning part.
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No
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Go to the next step.
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8
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• Cool down engine.
• Remove thermostat and inspect operation.
• Is thermostat okay?
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Yes
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Engine coolant temperature and thermostat are okay.
Inspect engine block for leakage or blockage.
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No
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Access ECT PID on WDS or equivalent.
Inspect both ECT PID and temperature gauge readings.
• If temperature gauge on instrument cluster indicates normal range but ECT PID is not same as temperature gauge reading, inspect ECT sensor.
• If temperature gauge on instrument cluster indicates overheating but ECT PID is normal, inspect temperature gauge and heat gauge unit.
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9
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• Verify test results.
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- If okay, return to diagnostic index to service any additional symptoms.
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- If malfunction remains, inspect related Service Information and perform repair or diagnosis.
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• If vehicle is repaired, troubleshooting completed.
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• If vehicle is not repaired or additional diagnostic information is not available, replace PCM.
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