Inspection Procedure

HINT:

• If DTCs P0115, P0116, P0117, P0118 and P0125 are output simultaneously, ECT sensor circuit may be open or short. Perform the troubleshooting of DTC P0115, P0117 or P0118 first.
• Read freeze frame data using the hand-held tester. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was LEAN or RICH, and other data from the time the malfunction occurred.

1. CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC P0125) 
   OUTPUT RESULT TABLE
   
   

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

   HINT:

   If any other codes besides P0125 is output, perform the troubleshooting for those codes first.

   B: Go to RELEVANT DTC CHART (See  DIAGNOSTIC TROUBLE CODE CHART   ) 

   A: Go to next step. 

2. INSPECT THERMOSTAT (See  INSPECTION  ) 
   1. Check the valve opening temperature of the thermostat.
      1. OK: Valve opening temperature is 80 to 84°C (176 to 183°F) 

   HINT:

   Also check that the valve is completely closed under opening temperature as above.

   NG: REPLACE THERMOSTAT (See  REPLACEMENT  ) 

   OK: Go to next step. 

3. CHECK COOLING SYSTEM (See  ON-VEHICLE INSPECTION  ) 
   1. Check for defects in the cooling system that might cause the system to be too cold, such as abnormal radiator fan operation or a modified cooling system.

   NG: REPAIR OR REPLACE COOLING SYSTEM 

   OK: REPLACE ENGINE COOLANT TEMPERATURE SENSOR