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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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Connect the WDS or equivalent to the DLC-2.
Retrieve any continuous memory, KOEO and KOER DTCs.
Are there DTCs displayed?
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Yes
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DTC is displayed:
Go to the appropriate DTC test.
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No
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No DTC is displayed:
Go to the next step.
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2
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Remove thermostat and inspect operation.
Is the thermostat normal?
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Yes
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ECT and thermostat are normal.
Go to the next step.
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No
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Access the ECT PID on the WDS or equivalent.
Verify both the ECT PID and temperature gauge on instrument cluster readings.
If the temperature gauge in 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 in 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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3
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Is the throttle body free of contamination?
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Yes
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Inspect for air leakage from the intake-air system components while racing the engine to a higher speed.
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No
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Clean or replace throttle body.
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4
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Verify test results.
• If normal, return to the diagnostic index to service any additional symptoms.
• If the malfunction remains, replace PCM.
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