DTC P0116: Engine Coolant Temperature Sensor Circuit Range/Performance Or P0125: Insufficient Coolant Temperature For Closed Loop Fuel Control: Notes
WARNING: This page is about a different car, the 2003 Toyota Sequoia. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
If DTCs P0115 and P0116 are output simultaneously, E2 sensor ground circuit may be open. Perform DTC P0115: ENGINE COOLANT TEMPERATURE SENSOR CIRCUIT test before performing DTC P0116 test.