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 50°C (14 to 122°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 50°C (122°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.

Tip:

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

*: Refer to Initialization.

Click here

A234891E17

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 sub-assembly

  • PCV system

  • Air cleaner filter element sub-assembly

  • Intake system

  • VVT system

  • EGR valve assembly

  • 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 sub-assembly

Frequency of Operation

Once per driving cycle

TYPICAL MALFUNCTION THRESHOLDS

Accumulated mass air flow

Less than 30 g (varies with engine coolant temperature)

CONFIRMATION DRIVING PATTERN

  1. Connect the GTS to the DLC3.

  2. Turn the power switch on (IG) and turn the GTS on.

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

  4. Turn the power switch off and wait for at least 30 seconds.

  5. Turn the power switch on (IG) and turn the GTS on.

  6. Put the engine in inspection mode (maintenance mode).

    Click here

  7. Start the engine and warm it up for 5 minutes or more.

  8. Stop the engine.

  9. Leave the vehicle outside overnight.

  10. Turn the power switch on (IG) and turn the GTS on [A].

  11. Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / Coolant Temp.

  12. Check that "Coolant Temp" in the Data List is within the range of -10 to 50°C (14 to 122°F).

  13. Put the engine in inspection mode (maintenance mode).

    Click here

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

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

  16. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

  17. Read the pending DTC.

    Tip:

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

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

  18. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

  19. Input the DTC: P050A.

  20. 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
    Tip:

    • 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] and [B].

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.

Tip:

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 moving or stationary, 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 power switch on (IG).

    3. Turn the GTS on.

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

    5. Read the DTCs.

      Powertrain > Engine and ECT > Trouble Codes

      Result

      Result

      Proceed to

      DTC P050A is output

      A

      DTC P050A and other DTCs are output

      B
      Tip:

      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)

    Tip:

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

    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Put the engine in inspection mode (maintenance mode).

      Powertrain > Hybrid Control > Utility

      Tester Display

      Inspection Mode

    5. Start the engine.

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

      Powertrain > Engine and ECT > Data List

      Tester Display

      Short FT #1

      Long FT #1

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

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

      Standard

      The total of the Short FT #1 and Long FT #1 values is between -20% and 20%.

    Result

    Proceed to

    OK

    NG
    NG

    CHECK PCV SYSTEMClick 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
    NG

    REPAIR OR REPLACE THROTTLE BODY WITH MOTOR ASSEMBLYClick here

    OK

  4. PERFORM ACTIVE TEST USING GTS (CONTROL THE EGR STEP POSITION)

    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Put the engine in inspection mode (maintenance mode).

      Powertrain > Hybrid Control > Utility

      Tester Display

      Inspection Mode

    5. Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher.

      Tip:

      The A/C switch and all accessory switches should be off.

    6. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the EGR Step Position / Primary / MAP and Throttle Idle Position.

      Powertrain > Engine and ECT > Active Test

      Active Test Display

      Control the EGR Step Position

      Data List Display

      MAP

      Throttle Idle Position

    7. Confirm that the Throttle Idle Position is ON and check the MAP values in the Data List while performing the Active Test.

      Tip:

      • Do not leave the EGR valve open for 10 seconds or more during the Active Test.

      • Be sure to return the EGR valve to step 0 when the Active Test is completed.

      • Do not open the EGR valve 30 steps or more during the Active Test.

      OK

      MAP change in response to EGR step position when Throttle Idle Position is ON in Data List.

      Standard

      -

      EGR Step Position (Active Test)

      0 Steps

      0 to 30 Steps

      MAP

      (Data List)

      (EGR valve is fully closed)

      MAP value is at least +10 kPa (75 mmHg) higher than when EGR valve is fully closed
      Tip:

      • While performing the Active Test, if the increase in the value of MAP is small, the EGR valve assembly may be a malfunctioning.

      • Even if the EGR valve assembly is malfunctioning, rough idling or an increase in the value of MAP may occur while performing the Active Test. However, the amount that the value of MAP increases will be smaller than normal.

    Result

    Proceed to

    OK

    NG
    OK

    CHECK WHETHER DTC OUTPUT RECURS (DTC P050A)Click here

    NG

  5. INSPECT EGR VALVE ASSEMBLY

    1. Remove the EGR valve assembly.

      Click here

    2. Check if the EGR valve is stuck open.

      OK

      EGR valve is tightly closed.

    Result

    Proceed to

    OK

    NG
    OK

    CHECK WHETHER DTC OUTPUT RECURS (DTC P050A)Click here

    NG

    REPLACE EGR VALVE ASSEMBLYClick here

  6. REPAIR OR REPLACE THROTTLE BODY WITH MOTOR ASSEMBLY

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

      Click here

      Tip:

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

      Click here

    Result

    Proceed to

    NEXT
    NEXT

    CHECK WHETHER DTC OUTPUT RECURS (DTC P050A)Click here

  7. 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 HOSEClick here

    OK

  8. 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 SYSTEMClick here

    OK

  9. 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-ASSEMBLYClick here

    OK

  10. PERFORM ACTIVE TEST USING GTS (CONTROL THE EGR STEP POSITION)

    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Put the engine in inspection mode (maintenance mode).

      Powertrain > Hybrid Control > Utility

      Tester Display

      Inspection Mode

    5. Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher.

      Tip:

      The A/C switch and all accessory switches should be off.

    6. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the EGR Step Position / Primary / MAP and Throttle Idle Position.

      Powertrain > Engine and ECT > Active Test

      Active Test Display

      Control the EGR Step Position

      Data List Display

      MAP

      Throttle Idle Position

    7. Confirm that the Throttle Idle Position is ON and check the MAP values in the Data List while performing the Active Test.

      Tip:

      • Do not leave the EGR valve open for 10 seconds or more during the Active Test.

      • Be sure to return the EGR valve to step 0 when the Active Test is completed.

      • Do not open the EGR valve 30 steps or more during the Active Test.

      OK

      MAP change in response to EGR step position when Throttle Idle Position is ON in Data List.

      Standard

      -

      EGR Step Position (Active Test)

      0 Steps

      0 to 30 Steps

      MAP

      (Data List)

      (EGR valve is fully closed)

      MAP value is at least +10 kPa (75 mmHg) higher than when EGR valve is fully closed
      Tip:

      • While performing the Active Test, if the increase in the value of MAP is small, the EGR valve assembly may be a malfunctioning.

      • Even if the EGR valve assembly is malfunctioning, rough idling or an increase in the value of MAP may occur while performing the Active Test. However, the amount that the value of MAP increases will be smaller than normal.

    Result

    Proceed to

    OK

    NG
    OK

    PERFORM ACTIVE TEST USING GTS (CONTROL THE VVT LINEAR)Click here

    NG

  11. INSPECT EGR VALVE ASSEMBLY

    1. Remove the EGR valve assembly.

      Click here

    2. Check if the EGR valve is stuck open.

      OK

      EGR valve is tightly closed.

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE EGR VALVE ASSEMBLYClick here

    OK

  12. PERFORM ACTIVE TEST USING GTS (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 DTC P0011 Procedure.

        Click here

    Result

    Proceed to

    OK

    NG
    NG

    CHECK AND REPAIR VVT SYSTEMClick here

    OK

  13. READ VALUE USING GTS (MAF)

    Click here

    Result

    Proceed to

    OK

    NG
    NG

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

    OK

  14. 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 power switch on (IG).

    3. Turn the GTS on.

    4. Clear the DTCs.

      Powertrain > Engine and ECT > Clear DTCs

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

    6. Turn the power switch on (IG) and turn the GTS on.

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

      Powertrain > Engine and ECT > Data List

      Tester Display

      Coolant Temp

    8. Check that the engine coolant temperature is between -10 and 50°C (14 and 122°F).

    9. Put the engine in inspection mode (maintenance mode).

      Powertrain > Hybrid Control > Utility

      Tester Display

      Inspection Mode

    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 and ECT / Utility / All Readiness.

      Powertrain > Engine and ECT > 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

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

  15. CHECK AND REPAIR VVT SYSTEM

    1. Check and repair the VVT system.

      Tip:

      Refer to DTC P0011 Procedure.

      Click here

    Result

    Proceed to

    NEXT
    NEXT

    CHECK WHETHER DTC OUTPUT RECURS (DTC P050A)Click here

  16. REPLACE EGR VALVE ASSEMBLY

    1. Replace the EGR valve assembly.

      Click here

      Tip:

      Perform "Inspection After Repair" after replacing the EGR valve assembly.

      Click here

    Result

    Proceed to

    NEXT
    NEXT

    CHECK WHETHER DTC OUTPUT RECURS (DTC P050A)Click here

  17. REPLACE AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY

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

    Result

    Proceed to

    NEXT
    NEXT

    CHECK WHETHER DTC OUTPUT RECURS (DTC P050A)Click here

  18. REPAIR OR REPLACE INTAKE SYSTEM

    1. Repair or replace the intake system.

      Tip:

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

      Click here

    Result

    Proceed to

    NEXT
    NEXT

    CHECK WHETHER DTC OUTPUT RECURS (DTC P050A)Click here

  19. REPAIR OR REPLACE PCV HOSE

    1. Repair or replace PCV valve or hose.

    Result

    Proceed to

    NEXT
    NEXT

  20. 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 power switch on (IG).

    3. Turn the GTS on.

    4. Clear the DTCs.

      Powertrain > Engine and ECT > Clear DTCs

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

    6. Turn the power switch on (IG) and turn the GTS on.

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

      Powertrain > Engine and ECT > Data List

      Tester Display

      Coolant Temp

    8. Check that the engine coolant temperature is between -10 and 50°C (14 and 122°F).

    9. Put the engine in inspection mode (maintenance mode).

      Powertrain > Hybrid Control > Utility

      Tester Display

      Inspection Mode

    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 and ECT / Utility / All Readiness.

      Powertrain > Engine and ECT > 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

  21. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY CONNECTOR CONNECTION)

    1. Check the connection and terminal contact pressure of connectors and wire harnesses between the mass air flow meter sub-assembly and ECM.

      Click here

      Tip:

      Repair any problems.

    Result

    Proceed to

    NEXT
    NEXT

  22. 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 power switch on (IG).

    3. Turn the GTS on.

    4. Clear the DTCs.

      Powertrain > Engine and ECT > Clear DTCs

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

    6. Turn the power switch on (IG) and turn the GTS on.

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

      Powertrain > Engine and ECT > Data List

      Tester Display

      Coolant Temp

    8. Check that the engine coolant temperature is between -10 and 50°C (14 and 122°F).

    9. Put the engine in inspection mode (maintenance mode).

      Powertrain > Hybrid Control > Utility

      Tester Display

      Inspection Mode

    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 and ECT / Utility / All Readiness.

      Powertrain > Engine and ECT > 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

  23. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY - ECM)

    Click here

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  24. REPLACE INTAKE MASS AIR FLOW METER SUB-ASSEMBLY

    1. Replace the mass air flow meter sub-assembly.

      Click here

      Tip:

      • If the result of the inspection performed in step 13 indicated no problem, proceed to the next step without replacing the mass air flow meter sub-assembly.

      • Perform "Inspection After Repair" after replacing the mass air flow meter sub-assembly.

        Click here

    Result

    Proceed to

    NEXT
    NEXT

  25. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

    Tip:

    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 power switch on (IG).

    3. Turn the GTS on.

    4. Clear the DTCs.

      Powertrain > Engine and ECT > Clear DTCs

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

    6. Turn the power switch on (IG) and turn the GTS on.

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

      Powertrain > Engine and ECT > Data List

      Tester Display

      Coolant Temp

    8. Check that the engine coolant temperature is between -10 and 50°C (14 and 122°F).

    9. Put the engine in inspection mode (maintenance mode).

      Powertrain > Hybrid Control > Utility

      Tester Display

      Inspection Mode

    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 and ECT / Utility / All Readiness.

      Powertrain > Engine and ECT > 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