Typical Malfunction Thresholds

HINT:

• If DTCs P0115, P0116, P0117, P0118 and P0125 are output simultaneously, an ECT sensor circuit may be open or short. Perform the troubleshooting of DTC P0115, P0117 or P0118 first.
• Read freeze frame data using the intelligent 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) 

   Result: 

   DIAGNOSTIC TROUBLE CODE CHART
   
   

   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  

   A : GO TO NEXT STEP. 

2. INSPECT THERMOSTAT 
   1. Check the valve opening temperature of the thermostat.

      OK: 

      Valve opening temperature is 80 to 84°C (176 to 183°F) 

      HINT:

      Also check that the valve is completely closed below the opening temperature shown above.

   NG : REPLACE THERMOSTAT 

   OK : GO TO NEXT STEP. 

3. CHECK COOLING SYSTEM 
   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