Perform the diagnosis only once after starting the engine.
5. DIAGNOSTIC METHOD
Abnormality Judgment
If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.
Time Needed for Diagnosis: 2500 ms
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.
Normality Judgment
Judge as OK and clear the NG if the continuous time while the following conditions are established is more than the predetermined time.
Time Needed for Diagnosis: Less than 1 second
P0128
DTC P0128 COOLANT THERMOSTAT (ENGINE COOLANT TEMPERATURE BELOW THERMOSTAT REGULATING
TEMPERATURE)
1. OUTLINE OF DIAGNOSIS
Detect malfunctions of the thermostat function.
Judge as NG when the engine coolant temperature is lower than the estimated engine coolant temperature and the difference between them is
large. Judge as OK when the engine coolant temperature becomes to 75 锟斤拷C (167 锟斤拷F), and the difference is small, before judging NG.
2. COMPONENT DESCRIPTION
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