Inspection Procedure

HINT:

• If DTCs "P0115, P0116, P0117, P0118 and P0125" are output simultaneously, the engine coolant temperature sensor circuit may be open or short. Perform the troubleshooting for DTCs "P0115, P0117 or P0118" first.
• Read freeze frame data using the hand-held tester or the OBDII scan tool. 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 the malfunction occurred.

1. Check for other DTCs output (In addition to DTC P0125). 

   PREPARATION: 

   1. Connect the hand-held tester or the OBD II scan tool to the DLC3.
   2. Turn the ignition switch ON and push the hand-held tester or the OBD II scan tool main switch ON.
   3. Select the item "DIAGNOSIS/ENHANCED OBD II/DTC INFO/CURRENT CODES".

   CHECK: 

   Read the DTCs using the hand-held tester or the OBD II scan tool.

   Result: 

   DISPLAY (DTC OUTPUT) SPECIFICATION
   
   

   Display (DTC output)	Proceed to
   P0125	A
   "P0125" and other DTCs	B

   HINT:

   If any other codes besides "P0125" are output, perform the troubleshooting for those DTCs first.

   1. B: Go to relevant DTC chart (See  DIAGNOSTIC TROUBLE CODE CHART  ). 
   2. A: Go to next step. 
2. Inspect thermostat (See  INSPECT THERMOSTAT  INSPECTION). 

   NG: Replace thermostat (See  THERMOSTAT  COMPONENTS). 

   OK: Replace engine coolant temperature sensor.