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Home >> Toyota >> 2010 >> Yaris 2D Hatchback, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (Diagnostic Codes) (P043E-P1605) >> SFI System >> DTC P050A: Cold Start Idle Air Control System Performance >> Procedure

DTC P050A: Cold Start Idle Air Control System Performance: Procedure

  1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P050A) 
    1. Connect a Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn the Techstream on.
    4. Enter the following menus:
      1. Techstream - Select: Powertrain / Engine and ECT / Trouble Codes.
    5. Read DTCs.

      Result

      Display (DTC Output) Proceed To
      P050A A
      P050A and other DTCs B

      HINT: 

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

    B → See step   17 

    A: Go to next step 

  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 a Techstream to the DLC3.
    2. Start the engine.
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Short FT #1 and Long FT #1.
    5. Read the values displayed on the Techstream while the engine is idling.
    6. Add together the Short FT #1 and Long FT #1 values to obtain the total Fuel Trim.

      OK

      Total of Short FT #1 and Long FT #1 values is between -20% and 20%.

    NG → See step   7 

    OK: Go to next step 

  3. INSPECT THROTTLE BODY 
    1. Check that there are no deposits around the throttle valve.

      OK

      No deposits around the throttle valve.

    NG → See step   5 

    OK: Go to next step 

  4. REPLACE ECM 
    1. Replace ECM. Refer to REMOVAL .

    NEXT → See step   6 

  5. REPAIR OR REPLACE THROTTLE BODY 
    1. Repair or replace throttle body. Refer to REMOVAL .

    NEXT: Go to next step 

  6. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED 
    NOTE:

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

    1. Connect a Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn the Techstream on.
    4. Clear DTCs. Refer to DTC CHECK / CLEAR .
    5. Turn the ignition switch off and wait for at least 30 seconds.
    6. Turn the ignition switch ON and turn the Techstream on.
    7. Start the engine.
    8. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.
    9. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
    10. Input the DTC: P050A.
    11. Check the DTC judgment result.
      Tester Display Description
      NORMAL
      • DTC judgment completed
      • System normal
      ABNORMAL
      • DTC judgment completed
      • System abnormal
      INCOMPLETE
      • DTC judgment not completed
      • Perform driving pattern after confirming DTC enabling conditions
      UNKNOWN
      • Unable to perform DTC judgment
      • Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    NEXT → END 

  7. CHECK PCV SYSTEM 
    1. Check the PCV hose connections. Refer to ON-VEHICLE INSPECTION - Step 2 .

      OK

      PCV hose is connected correctly and is not damaged.

    NG → See step   12 

    OK: Go to next step 

  8. CHECK AIR INDUCTION SYSTEM 
    1. Check the air induction system for vacuum leaks. Refer to ON-VEHICLE INSPECTION - Step 2 .

      OK

      No leak from the air induction system.

    NG → See step   13 

    OK: Go to next step 

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

      OK

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

    NG → See step   14 

    OK: Go to next step 

  10. PERFORM ACTIVE TEST USING TECHSTREAM (OPERATE OCV) 
    1. Connect a Techstream to the DLC3.
    2. Start the engine.
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the VVT System (Bank 1).
    5. Check the engine speed while operating the OCV using the Techstream.

      OK

      Tester Operations Specified Conditions
      OCV OFF Normal engine speed
      OCV ON Engine idles roughly or stalls
      (soon after OCV switched from OFF to ON)

    NG → See step   15 

    OK: Go to next step 

  11. REPLACE MASS AIR FLOW METER 
    1. Replace mass air flow meter. Refer to REMOVAL .

    NEXT → See step   16 

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

    NEXT → See step   16 

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

    NEXT → See step   16 

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

    NEXT → See step   16 

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

      HINT: 

      Refer to DTC P0011 Inspection Procedure. Refer to INSPECTION PROCEDURE

    NEXT: Go to next step 

  16. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED (DTC P050A) 
    NOTE:

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

    1. Connect a Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn the Techstream on.
    4. Clear DTCs. Refer to DTC CHECK / CLEAR .
    5. Turn the ignition switch off and wait for at least 30 seconds.
    6. Turn the ignition switch ON and turn the Techstream on.
    7. Start the engine.
    8. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.
    9. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
    10. Input the DTC: P050A.
    11. Check the DTC judgment result.
      Tester Display Description
      NORMAL
      • DTC judgment completed
      • System normal
      ABNORMAL
      • DTC judgment completed
      • System abnormal
      INCOMPLETE
      • DTC judgment not completed
      • Perform driving pattern after confirming DTC enabling conditions
      UNKNOWN
      • Unable to perform DTC judgment
      • Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    NEXT → END 

  17. GO TO DTC CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART 
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