Diagnostic procedure
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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 the following:
• Engine coolant level
• Coolant leakage
• Water and anti-freeze mixture
• Radiator condition
• Collapsed or restricted radiator hoses
• Radiator pressure cap
• Overflow system
• Fan rotational direction
• Fuses
Are all items normal?
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Yes
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Go to the next step.
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No
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Service if necessary.
Repeat Step 1.
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2
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Connect the WDS or equivalent to the DLC-2.
Turn the ignition switch to the ON position (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, L3].)
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No
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No DTC is displayed:
Go to the next step.
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3
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Start the engine and idle it.
Turn the A/C switch on and set blower fan to any speed.
Does the 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 for the following and repair or replace if necessary:
• Refrigerant charging amount
• Open circuit in wiring harness between A/C relay and PCM terminal 1I
• Seized A/C magnetic clutch
• A/C magnetic clutch malfunction
If all items are normal, go to the next step.
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4
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Start the engine and idle it.
Turn the A/C switch on and set blower fan any speed.
Measure voltage at PCM terminal 1AP.
(See PCM INSPECTION [L8, LF, L3].)
Is voltage 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 the following:
• Refrigerant pressure switch operation
• The A/C switch is stuck open.
• Open or short circuit between refrigerant pressure switch and PCM terminal 1AU
• Open circuit of blower motor fan switch and resistor (if blower motor does not operate)
• The evaporator temperature sensor and A/C amplifier
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5
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Inspect cooling fan control system operation.
Does the cooling fan control system function properly?
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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 part.
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6
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Is the drive belt normal?
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Yes
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Go to the next step.
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No
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Replace the drive belt.
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7
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Is there leakage around the 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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8
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Is there leakage at the coolant hoses and/or radiator?
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Yes
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Replace the malfunctioning part.
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No
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Go to the next step.
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9
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Cool down the engine.
Remove thermostat and inspect operation.
Is thermostat normal?
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Yes
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The engine coolant temperature and thermostat are normal, inspect engine block for leakage or blockage.
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No
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Access ECT PID.
Inspect for 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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10
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• Verify test results.
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