SFI SYSTEM(w/ Canister Pump Module), Diagnostic DTC:P050B

DTC Code DTC Name
P050B 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 below 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.

Click here

A01V90XE17
DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P050B Cold Start Ignition Timing Performance Insufficient ignition timing retard at cold start (2 trip detection logic).

  • Throttle with motor body 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

MONITOR STRATEGY

Required Sensors/Components (Main) Throttle with motor body 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) and turn the GTS on.

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

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

  5. Turn the engine switch on (IG) and turn the GTS on [A].

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

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

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

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

  10. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [C].

  11. 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.

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

  13. Input the DTC: P050B.

  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.

    • 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.

CAUTION / NOTICE / HINT

Note

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

Tech Tips


  • DTC P050B 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 P050B)


    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 and ECT / Trouble Codes.

    5. Read the DTCs.


      Powertrain > Engine and ECT > Trouble Codes
      Result
      Result Proceed to
      DTC P050B is output A
      DTC P050B and other DTCs are output B

      Tech Tips

      If any DTCs other than 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 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 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

    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%.
      Result
      Proceed to
      OK
      NG

    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
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE THROTTLE WITH MOTOR BODY ASSEMBLY Click here

    OK

  4. CHECK WHETHER DTC OUTPUT RECURS (DTC 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 engine switch on (IG).

    3. Turn the GTS on.

    4. Clear the DTCs

      Click here


      Powertrain > Engine and ECT > 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 and ECT / Data List / Primary / Coolant Temp.


      Powertrain > Engine and ECT > Data List
      Tester Display
      Coolant Temp

    9. Check that the engine coolant temperature is between -10 and 50°C (14 and 122°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 and ECT / Utility / All Readiness.


      Powertrain > Engine and ECT > Utility
      Tester Display
      All Readiness

    13. Input the DTC: P050B.

    14. Check the DTC judgment result.

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

    A

    CHECK FOR INTERMITTENT PROBLEMS Click here

    B

  5. 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

  6. CHECK WHETHER DTC OUTPUT RECURS (DTC 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 engine switch on (IG).

    3. Turn the GTS on.

    4. Clear the DTCs.

      Click here


      Powertrain > Engine and ECT > 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 and ECT / Data List / Primary / Coolant Temp.


      Powertrain > Engine and ECT > Data List
      Tester Display
      Coolant Temp

    9. Check that the engine coolant temperature is between -10 and 50°C (14 and 122°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 and ECT / Utility / All Readiness.


      Powertrain > Engine and ECT > Utility
      Tester Display
      All Readiness

    13. Input the DTC: P050B.

    14. Check the DTC judgment result.

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

    B

    END

    A

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

    Result
    Proceed to
    OK
    NG

    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
      B1-5 (VG) - B77-91 (VG) Always Below 1 Ω
      B1-4 (E2G) - B77-92 (E2G) Always Below 1 Ω
      B1-5 (VG) or B77-91 (VG) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. 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 16 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

  9. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

    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.

      Click here


      Powertrain > Engine and ECT > 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 and ECT / Data List / Primary / Coolant Temp.


      Powertrain > Engine and ECT > Data List
      Tester Display
      Coolant Temp

    9. Check that the engine coolant temperature is between -10 and 50°C (14 and 122°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 and ECT / Utility / All Readiness.


      Powertrain > Engine and ECT > Utility
      Tester Display
      All Readiness

    13. Input the DTC: P050B.

    14. Check the DTC judgment result.

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

    A

    END

    B

    REPLACE ECM Click here

  10. REPAIR OR REPLACE THROTTLE WITH MOTOR BODY ASSEMBLY


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

      Click here

      Tech Tips

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

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  11. CHECK WHETHER DTC OUTPUT RECURS (DTC 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 engine switch on (IG).

    3. Turn the GTS on.

    4. Clear the DTCs.

      Click here


      Powertrain > Engine and ECT > 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 and ECT / Data List / Primary / Coolant Temp.


      Powertrain > Engine and ECT > Data List
      Tester Display
      Coolant Temp

    9. Check that the engine coolant temperature is between -10 and 50°C (14 and 122°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 and ECT / Utility / All Readiness.


      Powertrain > Engine and ECT > Utility
      Tester Display
      All Readiness

    13. Input the DTC: P050B.

    14. Check the DTC judgment result.

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

    A

    END

    B

    GO TO STEP 5 Click here

  12. 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

  13. CHECK INTAKE SYSTEM


    1. Check the intake system for vacuum leaks.

      Click here

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

    NG

    REPAIR OR REPLACE INTAKE SYSTEM Click here

    OK

  14. 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.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY Click here

    OK

  15. 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 P0011 Procedure (VVT 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

  16. READ VALUE USING GTS (MAF)

    Result
    Proceed to
    OK
    NG

    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 and ECT / Data List / Primary / MAF, Coolant Temp and Engine Speed.


      Powertrain > Engine and ECT > 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: N

      A/C: Off

      Engine Speed: 3000 rpm

      		 Between 8 gm/sec and 22 gm/sec
      Result
      Proceed to
      OK
      NG

    OK

    GO TO STEP 4 Click here

    NG

    GO TO STEP 5 Click here

  17. CHECK AND REPAIR VVT SYSTEM


    1. Check and repair the VVT system.

      Tech Tips


      • Refer to DTC P0011 Procedure for intake camshaft.

        Click here

      • Refer to DTC P0014 Procedure for exhaust camshaft.

        Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 11 Click here

  18. REPLACE AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY


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

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 11 Click here

  19. 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 11 Click here

  20. REPAIR OR REPLACE PCV HOSE


    1. Repair or replace the PCV valve or hose.

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 11 Click here