Troubleshooting

DTC P0116 - Engine Coolant Temperature Circuit Range / Performance Problem

CIRCUIT DESCRIPTION
A thermistor built into the engine coolant temperature sensor changes the resistance value according to the engine coolant temperature.
The structure of the sensor and connection to the ECM is the same as in the intake air temp. circuit.
If the ECM detects the DTC P0115, it operates the fail safe function in which the engine coolant temp. is assumed to be 80°C (176°F).





DETECTING CONDITION AND TROUBLE AREA





WIRING DIAGRAM





INSPECTION PROCEDURE

HINT: If DTC "P0115" (engine coolant temp. circuit malfunction) and "P0116" (engine coolant temp. circuit range/performance) are output simultaneously, engine coolant temp. sensor circuit may be open.
Perform troubleshooting of DTC P0115 first.