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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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Is the customer complaint "Lack of passenger compartment heat"?
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Yes
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Inspect the A/C heater system.
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No
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Go to the next step.
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2
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Does the engine speed continue at fast idle?
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Yes
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Go to the symptom troubleshooting "NO.9 SLOW RETURN TO IDLE [MZR-CD (RF-Turbo)]".
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No
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Go to the next step.
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3
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Connect the WDS or equivalent to the DLC-2.
Access the ECT PID.
Inspect the reading for both the ECT PID and the temperature gauge on instrument cluster.
Is the ECT PID the same as the temperature gauge reading?
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Yes
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Go to the next step.
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No
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If the temperature gauge on the instrument cluster indicates a normal range but the ECT PID is not the same as the temperature gauge reading, inspect the ECT sensor.
If the temperature gauge on the instrument cluster indicates a cold range but the ECT PID is normal, inspect the temperature gauge and the heat gauge unit.
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4
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Remove the thermostat and inspect the operation.
Is the thermostat 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 thermostat.
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5
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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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Perform the coolant heater system inspection.
Repair or replace the malfunctioning part according to coolant heater system operation results.
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No
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Repair or replace the malfunctioning part according to inspection result.
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6
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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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