DTC P0115

1 ANSWERS

1. amomipais82
   

   Hi There,
   DTC P0115
   DTC
   Diagnostic Item
   
   P0115
   Engine coolant Temperature Circuit Malfunction
   
   
   DESCRIPTION
   
   The engine coolant temperature (ECT) sensor is located in the coolant passage of the cylinder head. The ECT sensor is a variable resistor whose resistance changes as the temperature of the engine coolant flowing past the sensor changes. When coolant temperature is low, sensor resistance is high; when coolant temperature is high, sensor resistance is low. The engine control module (ECM) checks ECT voltage fifty times per second and uses the information to adjust fuel injector pulse width and ignition timing. When the temperature sensed is very cold, the ECM enriches the fuel mixture.
   
   TROUBLESHOOTING GUIDE
   DTC detection condition Probable cause
   Background
   
   The engine coolant temperature sensor converts the engine coolant temperature to a voltage and outputs it.
   The engine control module checks whether the voltage is within a specified range. In addition, it checks that the engine coolant temperature (signal) does not drop while the engine is warming up.
   Check area, Judgment Criteria
   
   Sensor output voltage has continued to be 4.6V or higher [corresponding to a coolant temperature of -45°C (-49°F) or lower] for 4 sec.
   Sensor output voltage has continued to be 0.1V or lower [corresponding to a coolant temperature of 140°C (284°F) or higher] for 4 sec.
   
   Check area, Judgment Criteria
   
   Sensor output voltage increased from a value lower than 1.6V to a value higher than 1.6V [Coolant temperature decreases from a higher than 40°C (104°F) temperature to a lower than 40°C (104°F) temperature.].
   Then the sensor output voltage has continued to be 1.6V or higher for 5 min.
   Check area
   
   The engine coolant temperature is approx. 40°C (104°F) or less after starting sequence is completed.
   Judgment Criteria
   
   Approx. 60 - 300 seconds have passed for the engine coolant temperature to rise to about 40°C (104°F) after starting sequence was completed.
   Engine coolant temperature sensor failed
   Open or shorted engine coolant temperature sensor circuit, or loose connector
   Engine control module failed  .
   Hope it helps

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