Troubleshooting

P0116 - Engine Coolant Temp.Circuit Range/Performance Problem

CIRCUIT DESCRIPTION

DTC Detecting Condition:

A thermistor built into the water temperature. sensor changes the resistance value according to the water temperature.
The structure of the sensor and connection to the engine ECM is the same as the ones of the air temperature sensor.

Wiring Diagram:

Step 1 - 2:

INSPECTION PROCEDURE

HINT:
- If DTCs P0115 and P0116 are output simultaneously, engine coolant temperature sensor circuit may be open. Perform troubleshooting of DTC P0115 first.
- Read freeze frame data using TOYOTA hand-held tester or OBDII scan tool. Because freeze frame records the engine conditions when the malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was lean or rich, etc. at the time of the malfunction.