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Home >> Scion >> 2004 >> xA Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Diagnosis >> DTC P0125: Insufficient Coolant Temperature For Closed Loop Fuel Control >> Inspection Procedure
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Inspection Procedure

NOTE:
  • 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 DTCS OUTPUT (IN ADDITION TO DTC P0125) 
    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 / OBD/MOBD / DTC INFO / CURRENT CODES".
    4. Read the DTCs using the hand-held tester or the OBD II scan tool.

      Result: 

      INSPECTION PROCEDURE

      Display (DTC output) Proceed to
      Only "P0125" Is Output A
      "P0125" And Other DTCs Are Output B
      NOTE: If any other codes besides "P0125s" is 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  INSPECTION  ) 
    1. NG : REPLACE THERMOSTAT (See  REPLACEMENT  ) 
    2. OK : REPLACE ENGINE COOLANT TEMPERATURE SENSOR 
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