Inspection Procedure

HINT:

• If DTCs "P0115, P0116, P0117, P0118 and P0125" are output simultaneously, engine coolant temperature 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 or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, it is useful for determining 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 of the malfunction.

1. CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC P0125) 
   1. Read the DTC using the hand-held tester or the OBD II scan tool.

      Result: 

      Fig 1: Result Description Chart

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   HINT:

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

   1. A: GO TO NEXT STEP. 
   2. B: GO TO RELEVANT DTC CHART (See  DIAGNOSTIC TROUBLE CODE CHART   ) 
2. INSPECT THERMOSTAT (See  INSPECTION  ) 
   1. OK: REPLACE ENGINE COOLANT TEMPERATURE SENSOR 
   2. NG: REPLACE THERMOSTAT (See  REPLACEMENT  )