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Symptom: P0128-THERMOSTAT RATIONALITY When Monitored and Set Condition: P0128-THERMOSTAT RATIONALITY When Monitored: The engine running. During cold start. Set Condition: The PCM predicts a coolant temperature value that it will compare to the actual coolant temperature. If the two coolant temperature values are not within 10°C POSSIBLE CAUSES GOOD TRIP EQUAL TO ZERO LOW COOLANT LEVEL OTHER POSSIBLE CAUSES SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE MONITOR ENGINE COOLANT TEMPERATURE TEMPERATURE SENSOR VOLTAGE BELOW 1.0 VOLT SIGNAL CIRCUIT OPEN SENSOR GROUND CIRCUIT OPEN SIGNAL CIRCUIT SHORTED TO GROUND SIGNAL CIRCUIT SHORTED TO SENSOR GROUND PCM LOW PCM HIGH TEST ACTION APPLICABILITY 1 NOTE: If any ECT, AAT, CMP or CKP sensor DTCs have set along with P0128, t, read DTCs and record the related Freeze Frame data. Is the Good Trip displayed and equal to zero? All Yes → Go To 2 No → Refer to the INTERMITTENT CONDITION symptom in the Driveability category. 81 DRIVEABILITY - NGC |