SFI SYSTEM, Diagnostic DTC:P050A, P050B

DTC Code DTC Name
P050A Cold Start Idle Air Control System Performance
P050B Cold Start Ignition Timing Performance

DESCRIPTION

Cold start emission reduction strategy (CSERS) is employed to shorten the time to catalyst light-off from cold start. CSERS consists of retarded ignition timing and increased engine idle speed for a calibrated period of time. This monitor detects malfunctions of the estimated exhaust gas temperature, ECM commanded ignition timing and engine idle speed not reaching the target values.

DTC No. DTC Detection Condition Trouble Area
P050A

The engine speed does not achieve the target engine speed for 7 seconds with engine cooled down.

(2 trip detection logic)

  • Throttle with motor body assembly

  • Mass air flow meter

  • PCV system

  • Air cleaner filter element

  • Intake system

  • VVT system

  • Wire harness or connector

  • ECM
P050B

The ignition timing is not retarded for 7 seconds, despite rapid warming control of the catalyst (to retard the ignition timing).

(2 trip detection logic)

CONFIRMATION DRIVING PATTERN


  1. Connect the GTS to the DLC3.

  2. Turn the ignition switch to ON and turn the GTS on.

  3. Check the coolant temperature recorded in the Freeze Frame data.

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

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

  6. Turn the ignition switch to ON and turn the GTS on.

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

  8. Check that the coolant temperature is the same as that recorded in the Freeze Frame data.

    Tech Tips

    If the conditions are not met, then turn the ignition switch off, and wait until the conditions are met.

  9. Start the engine and warm it up until the engine coolant temperature reaches 80°C (176°F) or higher.

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

  11. Read pending DTCs.

    Tech Tips


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

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

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

  13. Input the DTC: P050A or P50B.

  14. 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.

  15. If the test result is INCOMPLETE or N/A and no DTC is output, perform a universal trip and check for permanent DTCs Click here.

    Tech Tips


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

    • If no permanent DTC is output, the system is normal.

WIRING DIAGRAM

Refer to DTC P0102 Click here.

CAUTION / NOTICE / HINT

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 help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

Note

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

PROCEDURE


  1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P050A OR P050B)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

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

    5. Read DTCs.

      Result
      Result Proceed to
      DTC P050A or P050B is output A
      DTC P050A or P050B and other DTCs are output B

      Tech Tips

      If any DTCs other than P050A or P050B 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 / Short FT #1 and Long FT #1.

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

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

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

    NG

    CHECK PCV SYSTEM Click here

    OK

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


    1. Check 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
      Result Proceed to
      NG A
      OK B

    B

    CHECK WHETHER DTC OUTPUT RECURS (DTC P050A OR P050B) Click here

    A

  4. REPLACE THROTTLE WITH MOTOR BODY ASSEMBLY


    1. Replace the throttle with motor body assembly Click here.


    NEXT

    CHECK WHETHER DTC OUTPUT RECURS (DTC P050A OR P050B) 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.

    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 the intake system.

    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 is not excessively contaminated with dirt or oil.

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

    NG

    REPLACE AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY Click here

    OK

  8. PERFORM ACTIVE TEST USING GTS (OPERATE CAMSHAFT TIMING OIL CONTROL VALVE)


    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 P000A inspection procedure (VVT system for intake camshaft) Click here.

      2. Perform the Active Test, referring to DTC P000B inspection procedure (VVT system for exhaust camshaft) Click here.


    NG

    CHECK AND REPAIR VVT SYSTEM Click here

    OK

  9. READ VALUE USING GTS (MAF)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Start the engine.

    5. Enter the following menus: Powertrain / Engine / Data List / MAF.

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

      Standard
      GTS display Condition Specified condition
      MAF Engine speed at 3000 rpm 8 to 13 g/s

    OK

    CHECK WHETHER DTC OUTPUT RECURS (DTC P050A OR P050B) Click here

    NG

    CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER CONNECTOR CONNECTION) Click here

  10. REPAIR OR REPLACE PCV HOSE


    1. Repair or replace the PCV valve or hose.


    NEXT

    CHECK WHETHER DTC OUTPUT RECURS (DTC P050A OR P050B) Click here

  11. REPAIR OR REPLACE INTAKE SYSTEM


    1. Repair or replace the intake system.


    NEXT

    CHECK WHETHER DTC OUTPUT RECURS (DTC P050A OR P050B) Click here

  12. REPLACE AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY


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


    NEXT

    CHECK WHETHER DTC OUTPUT RECURS (DTC P050A OR P050B) Click here

  13. CHECK AND REPAIR VVT SYSTEM


    1. Check and repair the VVT system.

      Tech Tips


      • Refer to DTC P000A Inspection Procedure (VVT system for intake camshaft) Click here.

      • Refer to DTC P000B Inspection Procedure (VVT system for exhaust camshaft) Click here.


    NEXT

  14. CHECK WHETHER DTC OUTPUT RECURS (DTC P050A OR P050B)

    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 ignition switch to ON.

    3. Turn the GTS on.

    4. Clear the DTCs Click here.

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

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

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

    8. Input the DTC: P050A or P050B.

    9. Check the DTC judgment result.

      Result
      Result Proceed to
      NORMAL (DTC is not output) A
      ABNORMAL (DTC P050A or P050B is output) B

    A

    CHECK FOR INTERMITTENT PROBLEMS Click here

    B

  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 Click here.

      Tech Tips

      Repair any problems.


    NEXT

  16. CHECK WHETHER DTC OUTPUT RECURS (DTC P050A OR P050B)

    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 ignition switch to ON.

    3. Turn the GTS on.

    4. Clear the DTCs Click here.

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

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

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

    8. Input the DTC: P050A or P050B.

    9. Check the DTC judgment result.

      Result
      Result Proceed to
      ABNORMAL (DTC P050A or P050B is output) A
      NORMAL (DTC is not output) B

    B

    END

    A

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


    1. Disconnect the mass air flow meter connector.

    2. Disconnect the ECM connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for open)
      Tester Connection Condition Specified Condition
      C33-22 (VG) - C16-5 (VG) Always Below 1 Ω
      C33-29 (E2G) - C16-4 (E2G) Always Below 1 Ω
      Standard Resistance (Check for short)
      Tester Connection Condition Specified Condition
      C33-22 (VG) or C16-5 (VG) - Body ground Always 10 kΩ or higher
      C33-29 (E2G) or C16-4 (E2G) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  18. REPLACE MASS AIR FLOW METER


    1. Replace the mass air flow meter Click here.

      Tech Tips

      If the results of the inspections performed in step 9 indicated no problem, proceed to the next step without replacing the mass air flow meter.


    NEXT

  19. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

    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 ignition switch to ON.

    3. Turn the GTS on.

    4. Clear the DTCs Click here.

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

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

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

    8. Input the DTC: P050A or P50B.

    9. Check the DTC judgment result.

      Result
      Result Proceed to
      NORMAL (DTC is not output) A
      ABNORMAL (DTC P050A or P050B is output) B

    A

    END

    B

    REPLACE ECM Click here