Troubleshooting

DTC P0116 Engine Coolant Temperature Circuit Range/Performance Problem

CIRCUIT DESCRIPTION

DTC Detecting Condition:

A thermistor built into the engine coolant temp. 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 temperature circuit malfunction.

If the ECM detects the DTC P0115, it operates the fail-safe function in which the engine coolant temperature is assumed to be 80 °C (176 °C).

Step 1:

Step 2:

INSPECTION PROCEDURE

HINT:
- If different DTCs that are related to different systems are output simultaneously while terminal E2 is used as a ground terminal, terminal E2 may be open.
- Read freeze frame data using hand-held tester or OBD II scan tool, as freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, it is useful to determine 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.