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Home >> Toyota >> 2019 >> Sequoia SR5, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 15 (Engine Control System (3UR-FBE) - Diagnostic Codes (3 Of 6)) >> SFI System >> DTC P050A: Cold Start Idle Air Control System Performance [08/2017 - 08/2018] >> Procedure

DTC P050A: Cold Start Idle Air Control System Performance [08/2017 - 08/2018]: Procedure

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  1. CHECK ANY OTHER DTCS OUTPUT 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
    5. Read DTCs.
      RESULT

      Result Proceed to
      DTC P050A A
      DTC P050A and other DTCs B

      HINT: 

      If any DTCs other than P050A are output, troubleshoot those DTCs first.

    Result: 

    NG 

    GO TO DTC CHART 

    (Refer to DIAGNOSTIC TROUBLE CODE CHART [08/2017 - 08/2018] )

    Result: 

    OK 

    See step  2

  2. READ VALUE USING TECHSTREAM (FUEL TRIM) 

    HINT: 

    Calculate the total fuel trim values to check the characteristic deviation of the mass air flow meter.

    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON and turn the Techstream ON.
    3. Enter the following menus: Powertrain / Engine and ECT / Data List / A/F Control System / Short FT B1S1 and Long FT B1S1, or Short FT B2S1 and Long FT B2S1.
    4. Read the values displayed on the Techstream.
    5. Add together the Short FT B1S1 and Long FT B1S1, or Short FT B2S1 and Long FT B2S1 values to obtain the total fuel trim.

      Result

      Total of Short FT B1S1 and Long FT B1S1, or Short FT B2S1 and Long FT B2S1 values is between -20% and 20%.

    Result: 

    NG 

    See step  5

    Result: 

    OK 

    See step  3

  3. INSPECT THROTTLE VALVE 
    1. Check for deposits around the throttle valve and throttle valve condition.

      OK

      No deposits around throttle valve and throttle valve moves smoothly.

    Result: 

    OK 

    See step  14

    Result: 

    NG 

    See step  4

  4. REPAIR OR REPLACE THROTTLE BODY ASSEMBLY 
    1. Repair or replace throttle body assembly (Refer to REMOVAL [08/2015 - 08/2018] ).

      HINT: 

      Perform "Inspection After Repair" after replacing the throttle body assembly (Refer to INITIALIZATION [08/2017 - 08/2018] ).

    Result: 

    NEXT 

    See step  14

  5. CHECK PCV SYSTEM 
    1. Check the PCV hose connections (Refer to PROCEDURE - Step 2 ).

      OK

      PCV hose is connected correctly and is not damaged.

    Result: 

    NG 

    See step  10

    Result: 

    OK 

    See step  6

  6. CHECK AIR INDUCTION SYSTEM 
    1. Check the air induction system for vacuum leakage (Refer to PROCEDURE - Step 4 ).

      HINT: 

      Perform "Inspection After Repair" after repairing or replacing the air induction system (Refer to INITIALIZATION [08/2017 - 08/2018] ).

    Result: 

    NG 

    See step  11

    Result: 

    OK 

    See step  7

  7. CHECK AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY 
    1. Visually check that the air cleaner filter element sub-assembly is not excessively contaminated with dirt or oil.

      OK

      The air cleaner filter element sub-assembly is not excessively contaminated with dirt or oil.

    Result: 

    NG 

    See step  12

    Result: 

    OK 

    See step  8

  8. PERFORM ACTIVE TEST USING TECHSTREAM (OPERATE CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY) 
    1. Operate the VVT system through the Active test, and check if the VVT system is operating normally.
      1. Perform the Active Test, referring to DTC P0011 inspection procedure (VVT system for intake side) (Refer to PROCEDURE - Step 2 ).
      2. Perform the Active Test, referring to DTC P0014 inspection procedure (VVT system for exhaust side) (Refer to PROCEDURE - Step 2 ).

    Result: 

    NG 

    See step  13

    Result: 

    OK 

    See step  9

  9. READ VALUE USING TECHSTREAM (MAF) 

    Refer to Fuel Injection System [08/2017 - 08/2018]

    Result: 

    OK 

    See step  14

    Result: 

    NG 

    See step  15

  10. REPAIR OR REPLACE PCV SYSTEM 
    1. Repair or replace the PCV system.

    Result: 

    NEXT 

    See step  14

  11. REPAIR OR REPLACE AIR INDUCTION SYSTEM 
    1. Repair or replace the air induction system.

      HINT: 

      Perform "Inspection After Repair" after repairing or replacing the air induction system (Refer to INITIALIZATION [08/2017 - 08/2018] ).

    Result: 

    NEXT 

    See step  14

  12. REPLACE AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY 
    1. Replace the air cleaner filter element sub-assembly.

    Result: 

    NEXT 

    See step  14

  13. CHECK AND REPAIR VVT SYSTEM 
    1. Check and repair the VVT system.

      HINT: 

    Result: 

    NEXT 

    See step  14

  14. CHECK WHETHER DTC OUTPUT RECURS (DTC P050A) 
    NOTE:

    For this operation, the engine must be cold (the same level as the engine coolant temperature recorded in the freeze frame data).

    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn the Techstream on.
    4. Clear DTCs (Refer to DTC CHECK / CLEAR [08/2015 - 08/2018] ).
    5. Turn the ignition switch off and wait for at least 30 seconds.
    6. Turn the ignition switch to ON and turn the Techstream on.
    7. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Coolant Temp.
    8. Check that the engine coolant temperature is between - 10°C and 50°C (14 and 122°F).
    9. Start the engine and warm it up.
    10. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
    11. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
    12. Input the DTC: P050A.
    13. Check the DTC judgment result.
      RESULT

      Result Proceed to
      NORMAL (DTC is not output) A
      ABNORMAL (DTC P050A is output) B

    Result: 

    A 

    CHECK FOR INTERMITTENT PROBLEMS 

    (Refer to CHECK FOR INTERMITTENT PROBLEMS [08/2015 - 08/2018] )

    Result: 

    B 

    See step  15

  15. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER CONNECTOR CONNECTION) 
    1. Check the connection and terminal contact pressure of connectors and wire harnesses between the mass air flow meter and ECM (Refer to ELECTRONIC CIRCUIT INSPECTION PROCEDURE [08/2015 - 08/2019] ).

      HINT: 

      Repair any problems.

    Result: 

    NEXT 

    See step  16

  16. CHECK WHETHER DTC OUTPUT RECURS (DTC P050A) 
    NOTE:

    For this operation, the engine must be cold (the same level as the engine coolant temperature recorded in the freeze frame data).

    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn the Techstream on.
    4. Clear DTCs (Refer to DTC CHECK / CLEAR [08/2015 - 08/2018] ).
    5. Turn the ignition switch off and wait for at least 30 seconds.
    6. Turn the ignition switch to ON and turn the Techstream on.
    7. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Coolant Temp.
    8. Check that the engine coolant temperature is between - 10°C and 50°C (14 and 122°F).
    9. Start the engine and warm it up.
    10. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
    11. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
    12. Input the DTC: P050A.
    13. Check the DTC judgment result.
      RESULT

      Result Proceed to
      ABNORMAL (DTC P050A is output) A
      NORMAL (DTC is not output) B

    Result: 

    B 

    END 

    Result: 

    A 

    See step  17

  17. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM) 

    Refer to DTC P0102: Mass or Volume Air Flow Circuit Low Input; DTC P0103: Mass or Volume Air Flow Circuit High Input [08/2017 - 08/2018]

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  18

  18. REPLACE MASS AIR FLOW METER 
    1. Replace the mass air flow meter (Refer to REMOVAL [08/2015 - 08/2018] ).

      HINT: 

      • If the result of the inspection performed in step 9 indicated no problem, proceed to the next step without replacing the mass air flow meter.
      • Perform "Inspection After Repair" after replacing the mass air flow meter (Refer to INITIALIZATION [08/2017 - 08/2018] ).

    Result: 

    NEXT 

    See step  19

  19. CHECK WHETHER DTC OUTPUT RECURS (DTC P050A) 
    NOTE:

    For this operation, the engine must be cold (the same level as the engine coolant temperature recorded in the freeze frame data).

    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn the Techstream on.
    4. Clear DTCs (Refer to DTC CHECK / CLEAR [08/2015 - 08/2018] ).
    5. Turn the ignition switch off and wait for at least 30 seconds.
    6. Turn the ignition switch to ON and turn the Techstream on.
    7. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Coolant Temp.
    8. Check that the engine coolant temperature is between - 10°C and 50°C (14 and 122°F).
    9. Start the engine and warm it up.
    10. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
    11. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
    12. Input the DTC: P050A.
    13. Check the DTC judgment result.
      RESULT

      Result Proceed to
      NORMAL (DTC is not output) A
      ABNORMAL (DTC P050A is output) B

    Result: 

    A 

    END 

    Result: 

    B 

    REPLACE ECM 

    (Refer to REMOVAL [08/2015 - 08/2018] )

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