DTC P0116: Engine Coolant Temperature (ECT) Sensor Range/Performance Problem

NOTE: If DTCs P0117 and/or P0118 are present, troubleshoot them before DTC P0116.

NOTE: As engine coolant temperature increases ECT sensor resistance decreases.

If DTC P0116 is present check for ECT sensor deterioration or cooling system malfunction. Also check for a damaged or dirty air cleaner element. Repair as necessary. If no problems are found, go to next step.
Connect SCS Service Connector Tool (0PAZ-0010100 ) to service check connector. See Figure . Start engine and run at 3000 RPM with no loads and transmission in Park or Neutral, until radiator fan comes on. Allow engine to idle. Using scan tool, check ECT sensor data. If indicated temperature is not 194-221°F (90-105°C), go to next step. If indicated temperature is as specified, problem is intermittent, system is okay at this time. Check cooling system. Repair as necessary.
Check cooling system. Repair as necessary. If cooling system is okay, replace ECT sensor.