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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 (around heater unit in passenger compartment, coolant hoses and/or radiator, and around coolant heater unit.)
• Water and anti-freeze mixture
• Radiator condition
• Collapsed or restricted radiator hoses
• Radiator pressure cap
• Drive belt tension
• Drive belt
• Fan rotational direction
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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Perform the self-test function using the WDS or equivalent.
Turn the engine switch to the ON position.
Retrieve any DTCs.
Are any DTCs displayed?
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Yes
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DTC is displayed:
Go to the appropriate DTC test.
Communication error message is displayed:
Inspect the following:
• Open circuit between PCM control relay and PCM terminal 119 or 120
• Open circuit PCM control relay and PCM terminal 105
• PCM control relay stuck open
• Open or poor ground circuit (PCM terminal 1, 2, 3, 114 or 117)
• Poor connection to vehicle body ground
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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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Note
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• The following test should be performed on the vehicles with an A/C system. Go to the next step for vehicles without an A/C system
Start the engine and run it at idle speed.
Turn the A/C switch off.
Does the A/C compressor 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 the symptom troubleshooting "NO.26 A/C ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY [MZR-CD (RF-Turbo)]".
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4
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Perform the Cooling Fan Control System Operation Inspection.
Does the cooling fan system work 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 according to inspection result.
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5
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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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6
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Perform the EGR system inspection.
Is the EGR system 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 part according to the EGR system operation results.
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7
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Perform the coolant heater system inspection.
Is the coolant heater system 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 part according to the coolant heater system operation results.
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8
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Cool down engine.
Remove the thermostat and inspect the operation.
Is the thermostat normal?
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Yes
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Thermostat is normal.
Inspect the cylinder block for leakage or blockage.
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No
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Replace thermostat.
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9
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Verify test results.
• If normal, return to the diagnostic index to service any additional symptoms.
• If the malfunction remains, inspect the related Service Information and perform repair or diagnosis.
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- If the vehicle is repaired, troubleshooting completed.
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- If the vehicle is not repaired or additional diagnostic information is not available, reprogram the PCM if later calibration is available. Retest.
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