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.

Tip:

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

Click here

A235493E17

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 ignition switch to ON and turn the GTS on.

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

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

  5. Turn the ignition switch to ON 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.

    Tip:

    • 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
    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] through [C] again.

CAUTION / NOTICE / HINT

Note:

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

Tip:

  • 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 ignition switch to ON.

    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
      Tip:

      If any DTCs other than P050B are output, troubleshoot those DTCs first.

    B

    GO TO DTC CHART

    Click hereClick 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. 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 SYSTEMClick 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 ASSEMBLYClick 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 ignition switch to ON.

    3. Turn the GTS on.

    4. Clear the DTCs

      Click here

      Powertrain > Engine and ECT > Clear DTCs

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

    6. Turn the ignition switch to ON.

    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 hereClick hereClick hereClick here

      Tip:

      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 ignition switch to ON.

    3. Turn the GTS on.

    4. Clear the DTCs.

      Click here

      Powertrain > Engine and ECT > Clear DTCs

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

    6. Turn the ignition switch to ON.

    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)

    Click here

    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

      Tip:

      • 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

    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 ignition switch to ON.

    3. Turn the GTS on.

    4. Clear the DTCs.

      Click here

      Powertrain > Engine and ECT > Clear DTCs

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

    6. Turn the ignition switch to ON.

    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

      Tip:

      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 ignition switch to ON.

    3. Turn the GTS on.

    4. Clear the DTCs.

      Click here

      Powertrain > Engine and ECT > Clear DTCs

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

    6. Turn the ignition switch to ON.

    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

    CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY CONNECTOR CONNECTION)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 HOSEClick 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 SYSTEMClick 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-ASSEMBLYClick 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 SYSTEMClick here

    OK

  16. READ VALUE USING GTS (MAF)

    Click here

    Result

    Proceed to

    OK

    NG
    OK

    CHECK WHETHER DTC OUTPUT RECURS (DTC P050B)Click here

    NG

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

  17. CHECK AND REPAIR VVT SYSTEM

    1. Check and repair the VVT system.

      Tip:

      • 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

    CHECK WHETHER DTC OUTPUT RECURS (DTC P050B)Click here

  18. 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 P050B)Click here

  19. 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 P050B)Click here

  20. REPAIR OR REPLACE PCV HOSE

    1. Repair or replace the PCV valve or hose.

    Result

    Proceed to

    NEXT
    NEXT

    CHECK WHETHER DTC OUTPUT RECURS (DTC P050B)Click here