SFI SYSTEM(w/ Canister Pump Module), Diagnostic DTC:P050A

DTC Code DTC Name
P050A Cold Start Idle Air Control System Performance

MONITOR DESCRIPTION

This monitor will run when the engine is started at an engine coolant temperature of -10 to 60°C (14 to 140°F). The DTC will be stored after the engine idles for 13 seconds (2 trip detection logic).

The DTC is designed to monitor the idle air control at cold start. When the engine is started at an engine coolant temperature of less than 60°C (140°F), the ECM measures the accumulated mass air flow during engine idling. If the accumulated mass air flow does not reach the specified level within 10 seconds, the ECM interprets this as a malfunction. The MIL is illuminated and a DTC is stored when the malfunction is detected in consecutive driving cycles (2 trip detection logic).

The electronic throttle control system controls the idle speed. The electronic throttle control system operates the throttle actuator to open and close the throttle valve, and adjusts the intake air amount to achieve the target idle speed.

Note

The idle speed control learned values are cleared by performing a learned value reset. Idle speed control learning needs to be performed before this DTC can be stored.

Tech Tips

Idle speed control learning is performed when the engine is warmed up and has been idling for 5 minutes.

B002DCXE23
DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P050A Cold Start Idle Air Control System Performance Insufficient mass air flow after a cold start (2 trip detection logic).

  • Throttle body with motor assembly

  • Mass air flow meter

  • PCV system

  • Air cleaner filter element sub-assembly

  • Intake system

  • VVT system

  • Wire harness or connector

  • ECM

 Comes on DTC stored

MONITOR STRATEGY

Required Sensors/Components (Main) Throttle body with motor assembly
Required Sensors/Components (Related)

Engine coolant temperature sensor

Mass air flow meter
Frequency of Operation Once per driving cycle

TYPICAL MALFUNCTION THRESHOLDS

Accumulated mass air flow Less than 184 g (varies with engine coolant temperature and ignition timing)

CONFIRMATION DRIVING PATTERN


  1. Connect the GTS to the DLC3.

  2. Turn the engine switch on (IG).

  3. Turn the GTS on.

  4. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).

  5. Turn the engine switch off and wait for at least 30 seconds.

  6. Turn the engine switch on (IG) [A].

  7. Turn the GTS on.

  8. Enter the following menus: Powertrain / Engine / Data List / All Data / Coolant Temp.

  9. Check that "Coolant Temp" in the Data List is within the range of -10 to 60°C (14 to 140°F).

  10. Start the engine and warm it up until the coolant temperature is the same as the coolant temperature in the freeze frame data.

  11. Idle the engine for 1 minute or more [B].

  12. Enter the following menus: Powertrain / Engine / Trouble Codes [C].

  13. Read the pending DTC.

    Tech Tips


    • If a pending DTC is output, the system is malfunctioning.

    • If a pending DTC is not output, perform the following procedure.

  14. Enter the following menus: Powertrain / Engine / Utility / All Readiness.

  15. Input the DTC: P050A.

  16. Check the DTC judgment result.

    GTS 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
    N/A

    • Unable to perform DTC judgment

    • Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    Tech Tips


    • If the judgment result shows NORMAL, the system is normal.

    • If the judgment result shows ABNORMAL, the system has a malfunction.

    • If the judgment result shows INCOMPLETE or N/A, idle the engine for 3 minutes, let the engine cool down, and then perform steps [A] through [C] again.

WIRING DIAGRAM

Refer to DTC P0102.

Click here

CAUTION / NOTICE / HINT

Note

Inspect the fuses for circuits related to this system before performing the following procedure.

Tech Tips

Read freeze frame data using the GTS. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

PROCEDURE


  1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P050A)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine / Trouble Codes.


      Powertrain > Engine > Trouble Codes

    5. Read the DTCs.

      Result
      Result Proceed to
      DTC P050A is output A
      DTC P050A and other DTCs are output B

      Tech Tips

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


    B

    GO TO DTC CHART Click here

    A

  2. READ VALUE USING GTS (FUEL TRIM)

    Tech Tips

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


    1. Connect the GTS to the DLC3.

    2. Start the engine.

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine / Data List / Ptrl AF Control / Short FT #1, Long FT #1, Short FT #2 and Long FT #2.


      Powertrain > Engine > Data List
      Tester Display
      Short FT #1
      Long FT #1
      Short FT #2
      Long FT #2

    5. Read the values displayed on the GTS at engine idle.

    6. Add together the Short FT #1 and Long FT #1 values, and the Short FT #2 and Long FT #2 values to obtain the total fuel trim.

      Standard
      The total of the Short FT #1 and Long FT #1 values, and the total of the Short FT #2 and Long FT #2 values is between -20% and 20%.
      Result
      Proceed to
      OK
      NG

    NG

    CHECK PCV SYSTEM Click here

    OK

  3. INSPECT THROTTLE BODY WITH MOTOR ASSEMBLY (THROTTLE VALVE)


    1. Inspect that there are no deposits around the throttle valve and throttle valve condition.

      OK
      No deposits around the throttle valve and throttle valve moves smoothly.
      Result
      Proceed to
      OK
      NG

    OK

    GO TO STEP 10 Click here

    NG

  4. REPAIR OR REPLACE THROTTLE BODY WITH MOTOR ASSEMBLY


    1. Repair or replace the throttle body with motor assembly.

      Click here

      Tech Tips

      Perform "Inspection After Repair" after replacing the throttle body with motor assembly.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 15 Click here

  5. CHECK PCV SYSTEM


    1. Check the PCV hose connections.

      Click here

      OK
      PCV valve and hose are connected correctly and are not damaged.
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE PCV HOSE Click here

    OK

  6. CHECK INTAKE SYSTEM


    1. Check the intake system for vacuum leaks.

      Click here

      OK
      No leaks from intake system.
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE INTAKE SYSTEM Click here

    OK

  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
      Proceed to
      OK
      NG

    NG

    REPLACE AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY Click here

    OK

  8. PERFORM ACTIVE TEST USING GTS (CONTROL THE VVT-IE LINEAR AND CONTROL THE VVT LINEAR)


    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 ON-VEHICLE INSPECTION of cam timing control motor with EDU assembly (VVT-iE system for intake camshaft).

        Click here

      2. Perform the Active Test, referring to DTC P0014 Procedure (VVT system for exhaust camshaft).

        Click here

      Result
      Proceed to
      OK
      NG

    NG

    CHECK AND REPAIR VVT SYSTEM Click here

    OK

  9. READ VALUE USING GTS (MAF)

    Result
    Proceed to
    OK
    NG

    1. Connect the GTS to the DLC3.

    2. Start the engine.

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine / Data List / All Data / MAF, Coolant Temp and Engine Speed.


      Powertrain > Engine > Data List
      Tester Display
      Engine Speed
      MAF
      Coolant Temp

    5. Allow the engine to idle until Coolant Temp reaches 75°C (167°F) or higher.

    6. Read MAF with the engine speed at 3000 rpm.

      Standard
      GTS Display Condition Specified Condition
      MAF

      Shift lever position: P

      A/C: Off

      Engine Speed: 3000 rpm

      		 Between 17.0 gm/sec and 23.0 gm/sec
      Result
      Proceed to
      OK
      NG

    NG

    GO TO STEP 16 Click here

    OK

  10. CHECK WHETHER DTC OUTPUT RECURS (DTC P050A)

    Note

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


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Clear the DTCs.


      Powertrain > Engine > Clear DTCs

    5. Turn the engine switch off and wait for at least 30 seconds.

    6. Turn the engine switch on (IG).

    7. Turn the GTS on.

    8. Enter the following menus: Powertrain / Engine / Data List / All Data / Coolant Temp.


      Powertrain > Engine > Data List
      Tester Display
      Coolant Temp

    9. Check that the engine coolant temperature is between -10 and 60°C (14 and 140°F).

    10. Start the engine and warm it up until the engine coolant temperature is the same as the engine coolant temperature in the freeze frame data.

    11. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

    12. Enter the following menus: Powertrain / Engine / Utility / All Readiness.


      Powertrain > Engine > Utility
      Tester Display
      All Readiness

    13. Input the DTC: P050A.

    14. Check the DTC judgment result.

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

    A

    CHECK FOR INTERMITTENT PROBLEMS Click here

    B

    GO TO STEP 16 Click here

  11. CHECK AND REPAIR VVT SYSTEM


    1. Check and repair the VVT system.

      Tech Tips


      • Refer to DTC P0011 Procedure (VVT-iE system for intake camshaft).

        Click here

      • Refer to DTC P0014 Procedure (VVT system for exhaust camshaft).

        Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 15 Click here

  12. REPLACE AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY


    1. Replace the air cleaner filter element sub-assembly.

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 15 Click here

  13. REPAIR OR REPLACE INTAKE SYSTEM


    1. Repair or replace the intake system.

      Tech Tips

      Perform "Inspection After Repair" after repairing or replacing the intake system.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 15 Click here

  14. REPAIR OR REPLACE PCV HOSE


    1. Repair or replace PCV valve or hose.

      Result
      Proceed to
      NEXT

    NEXT

  15. CHECK WHETHER DTC OUTPUT RECURS (DTC P050A)

    Note

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


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Clear the DTCs.


      Powertrain > Engine > Clear DTCs

    5. Turn the engine switch off and wait for at least 30 seconds.

    6. Turn the engine switch on (IG).

    7. Turn the GTS on.

    8. Enter the following menus: Powertrain / Engine / Data List / All Data / Coolant Temp.


      Powertrain > Engine > Data List
      Tester Display
      Coolant Temp

    9. Check that the engine coolant temperature is between -10 and 60°C (14 and 140°F).

    10. Start the engine and warm it up until the engine coolant temperature is the same as the engine coolant temperature in the freeze frame data.

    11. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

    12. Enter the following menus: Powertrain / Engine / Utility / All Readiness.


      Powertrain > Engine > Utility
      Tester Display
      All Readiness

    13. Input the DTC: P050A.

    14. Check the DTC judgment result.

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

    A

    END

    B

  16. 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.

      Click here

      Tech Tips

      Repair any problems.

      Result
      Proceed to
      NEXT

    NEXT

  17. CHECK WHETHER DTC OUTPUT RECURS (DTC P050A)

    Note

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


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Clear the DTCs.


      Powertrain > Engine > Clear DTCs

    5. Turn the engine switch off and wait for at least 30 seconds.

    6. Turn the engine switch on (IG).

    7. Turn the GTS on.

    8. Enter the following menus: Powertrain / Engine / Data List / All Data / Coolant Temp.


      Powertrain > Engine > Data List
      Tester Display
      Coolant Temp

    9. Check that the engine coolant temperature is between -10 and 60°C (14 and 140°F).

    10. Start the engine and warm it up until the engine coolant temperature is the same as the engine coolant temperature in the freeze frame data.

    11. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

    12. Enter the following menus: Powertrain / Engine / Utility / All Readiness.


      Powertrain > Engine > Utility
      Tester Display
      All Readiness

    13. Input the DTC: P050A.

    14. Check the DTC judgment result.

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

    B

    END

    A

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

    Result
    Proceed to
    OK
    NG

    1. Replace the mass air flow meter.

      Click here

      Tech Tips

      Perform "Inspection After Repair" after replacing the mass air flow meter.

      Click here

      Result
      Proceed to
      NEXT

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  19. REPLACE MASS AIR FLOW METER


    1. Replace the mass air flow meter.

      Click here

      Tech Tips


      • 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.

        Click here

      Result
      Proceed to
      NEXT

    NEXT

  20. CHECK WHETHER DTC OUTPUT RECURS (DTC P050A)

    Tech Tips

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


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Clear the DTCs.


      Powertrain > Engine > Clear DTCs

    5. Turn the engine switch off and wait for at least 30 seconds.

    6. Turn the engine switch on (IG).

    7. Turn the GTS on.

    8. Enter the following menus: Powertrain / Engine / Data List / All Data / Coolant Temp.


      Powertrain > Engine > Data List
      Tester Display
      Coolant Temp

    9. Check that the engine coolant temperature is between -10 and 60°C (14 and 140°F).

    10. Start the engine and warm it up until the engine coolant temperature is the same as the engine coolant temperature in the freeze frame data.

    11. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

    12. Enter the following menus: Powertrain / Engine / Utility / All Readiness.


      Powertrain > Engine > Utility
      Tester Display
      All Readiness

    13. Input the DTC: P050A.

    14. Check the DTC judgment result.

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

    A

    END

    B

    REPLACE ECM Click here