Troubleshooting

CIRCUIT DESCRIPTION
A thermistor built into the engine coolant temp. sensor changes the resistance value according to the coolant temperature.
The structure of the sensor and connection to the ECM is the same as in the intake air temp. circuit malfunction.
If the ECM records the DTC Poll 5, it operates the fail safe function, in which the engine coolant temp. is assumed to be 80 °C (176 °F).





DETECTING CONDITION





WIRING DIAGRAM

INSPECTION PROCEDURE

HINT: If DTCs 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.