Outline Of Diagnosis
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Detect malfunctions of the thermostat function.
Judge as NG when any one of the following conditions is established.
- When the actual engine coolant temperature does not reach the maximum temperature for executing other OBDII diagnosis and Σ(Estimated engine coolant temperature - Actual engine coolant temperature) exceeds the predetermined value (judgment 1)
- When the actual engine coolant temperature does not reach the predetermined value and Σ (Estimated engine coolant temperature - Actual engine coolant temperature) exceeded the predetermined value. (Judgment 2)
- When the actual engine coolant temperature does not reach the predetermined value. (Judgment 3)