Diagnostic Aids

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An overheating condition may cause this DTC to set.
After starting the engine, the ECT sensor temperature should rise steadily to about 90°C (194°F) then stabilize after the thermostat opens.
If a short to a separate voltage source occurs, this DTC may set and damage the ECT sensor.
If an intermittent condition is suspected, refer to Testing for Intermittent Conditions and Poor Connections .