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Home >> Lexus >> 2011 >> IS 250 Base, RWD, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (Diagnostic Codes (P0010-P014F)) >> SFI System >> DTC P011B: Engine Coolant Temperature / Intake Air Temperature Correlation >> Procedure

DTC P011B: Engine Coolant Temperature / Intake Air Temperature Correlation: Procedure

  1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO P011B) 
    1. Connect Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Engine / Trouble Codes.
    5. Read the DTCs.

      Result

      Result Proceed to
      P011B A
      P011B and other DTCs B

      HINT: 

      If any DTCs other than P011B are output, troubleshoot those DTCs first.

    B → See step   4 

    A: Go to next step 

  2. READ VALUE USING TECHSTREAM (INTAKE AIR TEMPERATURE) 
    1. Leave the vehicle for 7 hours or more.

      HINT: 

      It is necessary leave the vehicle for 7 hours or more to allow conditions similar to the DTC detection conditions.

    2. Connect Techstream to the DLC3.
    3. Turn the engine switch on (IG).
    4. Turn the Techstream on.
    5. Enter the following menus: Powertrain / Engine / All Data / Intake Air.
    6. Read the value displayed on the Techstream.

      OK

      Difference between the intake air temperature and the actual outside air temperature is within 10°C (18°F).

      HINT: 

      Temperature readings on the vehicle's outside temperature gauge (if equipped) are not suitable for comparing to the intake air temperature reading. The outside temperature gauge has a significant delay built in to prevent temperature swings from being displayed on its display. Use an accurate thermometer to determine the outside air temperature.

    NG → See step   5 

    OK: Go to next step 

  3. READ VALUE USING TECHSTREAM (COOLANT TEMPERATURE) 
    1. Connect Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Engine / All Data / Coolant Temp.
    5. Read the value displayed on the Techstream.

      OK

      The difference between the coolant temperature and the actual outside air temperature is within 10°C (18°F).

      HINT: 

      If the result is not as specified, check that there are heat sources such as a block heater in the engine compartment.

    NG → See step   7 

    OK → See step   6 

  4. GO TO DTC CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART 
  5. REPLACE MASS AIR FLOW METER. Refer to  REMOVAL 
  6. REPLACE ECM. Refer to  REMOVAL 
  7. REPLACE ENGINE COOLANT TEMPERATURE SENSOR. Refer to  REMOVAL