Inspection Procedure

WARNING: This page is about a different car, the 2009 Toyota Prius. However, it is still accessible from the selected car via links, so may be relevant.

READ OUTPUT DTC

Connect Techstream to the DLC3.
Turn the power switch ON (IG) and turn the tester on.
Select the following menu items: Powertrain / Engine and ECT / Trouble Code.

Read the DTCs.

Result

RESULT CHART

Display (DTC Output)	Proceed To
P0116	A
P0116 and other DTCs	B

B: GO TO DTC CHART

A: Go To Next Step

INSPECT THERMOSTAT
1. Remove the thermostat (see REMOVAL ).
2. Measure the valve opening temperature of the thermostat.
  Standard temperature:
  
  80°C to 84°C (176°F to 183°F)
  
  HINT:
  
  In addition to the above check, confirm that the valve is completely closed when the temperature is below the standard.
3. Reinstall the thermostat (see INSTALLATION ).
NG: REPLACE THERMOSTAT

OK: REPLACE ENGINE COOLANT TEMPERATURE SENSOR