SFI SYSTEM(w/ Canister Pump Module), Diagnostic DTC:P050B00

DTC Code DTC Name
P050B00 Cold Start Ignition Timing 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 is stored after the engine idles for 13 seconds (2 trip detection logic).

The DTC is designed to monitor the ignition timing at cold start. When the engine is started at an engine coolant temperature of less than 50°C (122°F), the ECM checks the ignition timing during engine idling. If the ignition timing advances beyond 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).

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.

B00755KE21
DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory Note
P050B00 Cold Start Ignition Timing Performance Insufficient ignition timing retard at 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

  • Wire harness or connector

  • ECM

 Comes on DTC stored SAE Code: P050B

MONITOR STRATEGY

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

Mass air flow meter sub-assembly

Engine coolant temperature sensor
Frequency of Operation Once per driving cycle

TYPICAL MALFUNCTION THRESHOLDS

Accumulated time when ignition timing retard is cut off 8 seconds or more

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

  7. Stop the engine.

  8. Leave the vehicle outside overnight.

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

  10. Turn the GTS on.

  11. Enter the following menus: Powertrain / Engine / Data List / Coolant Temperature.

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

  13. Start the engine and warm it up until the coolant temperature is the same as the coolant temperature in the Freeze Frame Data.

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

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

  16. Read the 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.

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

  18. Input the DTC: P050B00.

  19. 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

    Tech Tips


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

    • If the judgment result is ABNORMAL, the system is malfunctioning.

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

WIRING DIAGRAM

Refer to DTC P010012.

Click here

CAUTION / NOTICE / HINT

Note

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

Tech Tips


  • DTC P050B00 may be output when the engine has the symptoms listed below. If necessary, check the trouble areas listed below.

    Symptom Factor Trouble Area
    Low idle speed when engine is cold (immediately after engine start) Excessive engine friction

    • Engine oil deterioration

    • Drive belt tension

    • A/C compressor

    • Generator
    Rough idle when engine is cold (immediately after engine start) Abnormal combustion Fuel quality

  • 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.

PROCEDURE


  1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P050B00)


    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.

    5. Read the DTCs.


      Powertrain > Engine > Trouble Codes
      Result
      Result Proceed to
      DTC P050B00 is output A
      DTC P050B00 and other DTCs are output B

      Tech Tips

      If any DTCs other than P050B00 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 sub-assembly.


    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 B1S1, Long FT B1S1, Short FT B2S1 and Long FT B2S1.


      Powertrain > Engine > Data List
      Tester Display
      Short FT B1S1
      Short FT B2S1
      Long FT B1S1
      Long FT B2S1

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

    6. Add together the Short FT B1S1 and Long FT B1S1 values, and the Short FT B2S1 and Long FT B2S1 values to obtain the total fuel trim.

      Standard
      GTS Display Specified Condition
      Total of the Short FT B1S1 and Long FT B1S1 Between -20 and 20%
      Total of the Short FT B2S1 and Long FT B2S1 Between -20 and 20%
      Result
      Proceed to
      OK
      NG

    NG

    CHECK PCV SYSTEM Click here

    OK

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


    1. Check for foreign matter between the throttle valve and housing. If necessary, clean the throttle body with motor assembly. Also, check that the throttle valve moves smoothly.

      OK
      Throttle valve is not contaminated with foreign matter and moves smoothly.
      Result
      Proceed to
      OK
      NG

    OK

    GO TO STEP 10 Click here

    NG

  4. REPLACE THROTTLE BODY WITH MOTOR ASSEMBLY


    1. 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 16 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 (CHECK VVT SYSTEM)


    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 P001100 Procedure (VVT system for intake camshaft).

        Click here

      2. Perform the Active Test, referring to DTC P001400 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 (MASS AIR FLOW SENSOR)


    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 / Data List / Engine Speed, Mass Air Flow Sensor and Coolant Temperature.


      Powertrain > Engine > Data List
      Tester Display
      Engine Speed
      Mass Air Flow Sensor
      Coolant Temperature

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

    6. Read Mass Air Flow Sensor while maintaining an engine speed of 3000 rpm.

      Standard
      GTS Display Condition Specified Condition
      Mass Air Flow Sensor

      Engine warmed up

      Shift position: P

      A/C: Off

      Engine Speed: 3000 rpm

      		 Between 10.6 and 15.8 gm/sec
      Result
      Proceed to
      OK
      NG

    NG

    GO TO STEP 18 Click here

    OK

  10. CLEAR DTC


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Clear the DTC.


      Powertrain > Engine > Clear DTCs

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

      Result
      Proceed to
      NEXT

    NEXT

  11. CHECK WHETHER DTC OUTPUT RECURS (DTC P050B00)

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


      Powertrain > Engine > Data List
      Tester Display
      Coolant Temperature

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

    6. 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.

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

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


      Powertrain > Engine > Utility
      Tester Display
      All Readiness

    9. Input the DTC: P050B00.

    10. Check the DTC judgment result.

      Result
      Result Proceed to

      NORMAL

      (DTCs are not output)

      		 A

      ABNORMAL

      (DTC P050B00 is output)

      		 B

    A

    CHECK FOR INTERMITTENT PROBLEMS Click here

    B

    GO TO STEP 18 Click here

  12. CHECK AND REPAIR VVT SYSTEM


    1. Check and repair the VVT system.

      Tech Tips


      • Refer to DTC P001100 Inspection Procedure for intake camshaft.

        Click here

      • Refer to DTC P001400 Inspection Procedure for exhaust camshaft.

        Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 16 Click here

  13. REPLACE AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY


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

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 16 Click here

  14. 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 16 Click here

  15. REPAIR OR REPLACE PCV HOSE


    1. Repair or replace the PCV valve or hose.

      Result
      Proceed to
      NEXT

    NEXT

  16. CLEAR DTC


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Clear the DTC.


      Powertrain > Engine > Clear DTCs

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

      Result
      Proceed to
      NEXT

    NEXT

  17. CHECK WHETHER DTC OUTPUT RECURS (DTC P050B00)

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


      Powertrain > Engine > Data List
      Tester Display
      Coolant Temperature

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

    6. 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.

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

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


      Powertrain > Engine > Utility
      Tester Display
      All Readiness

    9. Input the DTC: P050B00.

    10. Check the DTC judgment result.

      Result
      Result Proceed to

      NORMAL

      (DTCs are not output)

      		 A

      ABNORMAL

      (DTC P050B00 is output)

      		 B

    A

    END

    B

  18. 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

      Tech Tips

      Repair any problems.

      Result
      Proceed to
      NEXT

    NEXT

  19. CLEAR DTC


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Clear the DTC.


      Powertrain > Engine > Clear DTCs

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

      Result
      Proceed to
      NEXT

    NEXT

  20. CHECK WHETHER DTC OUTPUT RECURS (DTC P050B00)

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


      Powertrain > Engine > Data List
      Tester Display
      Coolant Temperature

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

    6. 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.

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

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


      Powertrain > Engine > Utility
      Tester Display
      All Readiness

    9. Input the DTC: P050B00.

    10. Check the DTC judgment result.

      Result
      Result Proceed to

      NORMAL

      (DTCs are not output)

      		 A

      ABNORMAL

      (DTC P050B00 is output)

      		 B

    A

    END

    B

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


    1. Disconnect the mass air flow meter sub-assembly connector.

    2. Disconnect the ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F38-5 (VG) - F87-116 (VG) Always Below 1 Ω
      F38-4 (E2G) - F87-115 (E2G) Always Below 1 Ω
      F38-5 (VG) or F87-116 (VG) - Body ground and other terminals Always 10 kΩ or higher
      F38-4 (E2G) or F87-115 (E2G) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  22. REPLACE MASS AIR FLOW METER SUB-ASSEMBLY


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

      Click here

      Tech Tips


      • If the results of the inspections performed in step 9 (READ VALUE USING GTS (MASS AIR FLOW SENSOR)) 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

  23. CLEAR DTC


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Clear the DTC.


      Powertrain > Engine > Clear DTCs

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

      Result
      Proceed to
      NEXT

    NEXT

  24. 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 engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine / Data List / Coolant Temperature.


      Powertrain > Engine > Data List
      Tester Display
      Coolant Temperature

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

    6. 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.

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

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


      Powertrain > Engine > Utility
      Tester Display
      All Readiness

    9. Input the DTC: P050B00.

    10. Check the DTC judgment result.

      Result
      Result Proceed to

      NORMAL

      (DTCs are not output)

      		 A

      ABNORMAL

      (DTC P050B00 is output)

      		 B

    A

    END

    B

    REPLACE ECM Click here