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Home >> Lexus >> 2024 >> TX 350 Base, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 103 (Engine Control System - Diagnostic Codes (4 Of 7)) >> SFI SYSTEM (for 1Motor-HEV Model) >> DTC P050B-00: Cold Start Ignition Timing Performance [09/2023 - ] >> Procedure

DTC P050B-00: Cold Start Ignition Timing Performance [09/2023 - ]: Procedure

WARNING: This page is about a different car, the 2024 Lexus TX 500h. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P050B-00) 
    1. Read the DTCs.

      Powertrain > Engine > Trouble Codes 

      Result

      Result Proceed to
      P050B-00 and other DTCs are output A
      P050B-00 is output B

      HINT: 

      If any DTCs other than P050B-00 are output, troubleshoot those DTCs first.

    Result: 

    A 

    GO TO DTC CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART [09/2023 - ] 

    Result: 

    B 

    See step  2

  2. READ VALUE USING GTS (FUEL TRIM) 

    HINT: 

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

    Pre-procedure1

    • Put the engine in Inspection Mode (for measuring Exhaust Gas).

      Powertrain > Hybrid Control > Utility 

      Tester Display
      Inspection Mode
    • Start the engine.
    • Read the values displayed on the GTS at engine idle.

      Powertrain > Engine > Data List 

      Tester Display
      Short FT B1S1
      Long FT B1S1
    • Add the Short FT B1S1 and Long FT B1S1 values to obtain the total fuel trim.

      Result

      Result Proceed to
      The sum of the value of Short FT B1S1 and Long FT B1S1 is -20 % or more, and less than 20 % A
      None of the above conditions are met B

    Post-procedure1

    • None

    Result: 

    B 

    See step  5

    Result: 

    A 

    See step  3

  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

    Result: 

    OK 

    See step  11

    Result: 

    NG 

    See step  4

  4. REPLACE THROTTLE BODY WITH MOTOR ASSEMBLY (THROTTLE WITH THROTTLE POSITION SENSOR BODY ASSEMBLY) 

    HINT: 

    Refer to REMOVAL [09/2023 - ]

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  34

  5. CHECK PCV VALVE AND HOSE CONNECTIONS 
    GTY1232831Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Check the PCV hose connections.
    2. Check the PCV valve.

      Refer to INSPECTION [09/2023 - ]

      OK

      PCV hose and PCV valve are connected correctly and are not damaged.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  33

    Result: 

    OK 

    See step  6

  6. CHECK INTAKE SYSTEM 
    1. Check the intake system for vacuum leaks.

      Refer to ON-VEHICLE INSPECTION [09/2023 - ]

      OK

      No leaks from intake system.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  32

    Result: 

    OK 

    See step  7

  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

    Result: 

    NG 

    See step  30

    Result: 

    OK 

    See step  8

  8. PERFORM ACTIVE TEST USING GTS (CONTROL THE INTAKE VVT OCV DUTY RATIO BANK 1) 

    Refer to PROCEDURE - Step 2

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    See step  22

    Result: 

    OK 

    See step  9

  9. PERFORM ACTIVE TEST USING GTS (CONTROL THE EXHAUST VVT OCV DUTY RATIO BANK 1) 

    Refer to PROCEDURE - Step 2

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    See step  13

    Result: 

    OK 

    See step  10

  10. READ VALUE USING GTS (MASS AIR FLOW SENSOR) 

    Pre-procedure1

    • Put the engine in Inspection Mode (for measuring Exhaust Gas).

      Powertrain > Hybrid Control > Utility 

      Tester Display
      Inspection Mode
    • Start the engine.
    • Allow the engine to idle until Coolant Temperature reaches 75°C (167°F) or higher with all the accessories switched off and the shift position in P.
    • Read Mass Air Flow Sensor while maintaining an engine speed of 2500 rpm.

      Powertrain > Engine > Data List 

      Tester Display
      Engine Speed
      Mass Air Flow Sensor

      Result

      Result Proceed to
      The value of Mass Air Flow Sensor is between 5 and 15 gm/sec A
      None of the above conditions are met B

    Post-procedure1

    • None

    Result: 

    B 

    See step  36

    Result: 

    A 

    See step  11

  11. CLEAR DTC 

    Pre-procedure1

    • None
    • Clear the DTCs.

      Powertrain > Engine > Clear DTCs 

      Result

      Proceed to
      NEXT

    Post-procedure1

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

    Result: 

    NEXT 

    See step  12

  12. CHECK WHETHER DTC OUTPUT RECURS (DTC P050B-00) 
    NOTE:

    In this operation, the engine must be cold (approximately the same as the engine coolant temperature recorded in the Freeze Frame Data).

    Pre-procedure1

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

      Powertrain > Engine > Data List 

      Tester Display
      Coolant Temperature
    • Put the engine in Inspection Mode (for measuring Exhaust Gas).

      Powertrain > Hybrid Control > Utility 

      Tester Display
      Inspection Mode
    • 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.
    • Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
    • Perform the All Readiness.

      Powertrain > Engine > Utility 

      Tester Display
      All Readiness
    • Input the DTC: P050B-00.
    • Check the DTC judgment result.

      Result

      Result Proceed to
      NORMAL
      (DTCs are not output)      		 A
      ABNORMAL
      (P050B-00 is output)      		 B

    Post-procedure1

    • None

    Result: 

    A 

    CHECK FOR INTERMITTENT PROBLEMS. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [09/2023 - ] 

    Result: 

    B 

    See step  36

  13. INSPECT CAM TIMING OIL CONTROL SOLENOID ASSEMBLY (FOR EXHAUST CAMSHAFT) 

    Refer to PROCEDURE - Step 5

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    See step  17

    Result: 

    OK 

    See step  14

  14. INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY (EXHAUST CAMSHAFT TIMING GEAR BOLT ASSEMBLY) 

    Refer to PROCEDURE - Step 6

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    See step  19

    Result: 

    OK 

    See step  15

  15. CHECK VALVE TIMING (CHECK FOR LOOSE TIMING CHAIN AND JUMPED TEETH) 

    Refer to PROCEDURE - Step 7

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    See step  21

    Result: 

    NG 

    See step  16

  16. REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA 
    1. Repair or replace malfunctioning parts, component and area.

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  34

  17. REPLACE CAM TIMING OIL CONTROL SOLENOID ASSEMBLY (FOR EXHAUST CAMSHAFT) 

    Refer to PROCEDURE - Step 8

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  18

  18. INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY (EXHAUST CAMSHAFT TIMING GEAR BOLT ASSEMBLY) 

    Refer to PROCEDURE - Step 9

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    See step  20

    Result: 

    NG 

    See step  19

  19. REPLACE CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY (EXHAUST CAMSHAFT TIMING GEAR BOLT ASSEMBLY) 

    Refer to PROCEDURE - Step 10

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  20

  20. PERFORM ACTIVE TEST USING GTS (CONTROL THE EXHAUST VVT OCV DUTY RATIO) 

    Refer to PROCEDURE - Step 11

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    See step  34

    Result: 

    NG 

    See step  21

  21. REPLACE CAMSHAFT TIMING EXHAUST GEAR ASSEMBLY 

    Refer to PROCEDURE - Step 12

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  34

  22. INSPECT CAM TIMING OIL CONTROL SOLENOID ASSEMBLY (FOR INTAKE CAMSHAFT) 

    Refer to PROCEDURE - Step 5

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    See step  26

    Result: 

    OK 

    See step  23

  23. INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY (INTAKE CAMSHAFT TIMING GEAR BOLT ASSEMBLY) 

    Refer to PROCEDURE - Step 6

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    See step  28

    Result: 

    OK 

    See step  24

  24. CHECK VALVE TIMING (CHECK FOR LOOSE TIMING CHAIN AND JUMPED TEETH) 

    Refer to PROCEDURE - Step 7

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    See step  31

    Result: 

    NG 

    See step  25

  25. REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA 
    1. Repair or replace malfunctioning parts, component and area.

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  34

  26. REPLACE CAM TIMING OIL CONTROL SOLENOID ASSEMBLY (FOR INTAKE CAMSHAFT) 

    Refer to PROCEDURE - Step 8

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  27

  27. INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY (INTAKE CAMSHAFT TIMING GEAR BOLT ASSEMBLY) 

    Refer to PROCEDURE - Step 9

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    See step  29

    Result: 

    NG 

    See step  28

  28. REPLACE CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY (INTAKE CAMSHAFT TIMING GEAR BOLT ASSEMBLY) 

    Refer to PROCEDURE - Step 10

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  29

  29. PERFORM ACTIVE TEST USING GTS (CONTROL THE INTAKE VVT OCV DUTY RATIO BANK 1) 

    Refer to PROCEDURE - Step 11

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    See step  34

    Result: 

    NG 

    See step  31

  30. REPLACE AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY 
    1. Replace the air cleaner filter element sub-assembly.

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  34

  31. REPLACE CAMSHAFT TIMING GEAR ASSEMBLY 

    Refer to PROCEDURE - Step 12

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  34

  32. REPAIR OR REPLACE INTAKE SYSTEM 
    1. Repair or replace the intake system.

      HINT: 

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

      Refer to INITIALIZATION [09/2023 - ]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  34

  33. REPAIR OR REPLACE PCV VALVE OR HOSE 
    1. Repair or replace PCV valve or hose.

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  34

  34. CLEAR DTC 

    Pre-procedure1

    • None
    • Clear the DTCs.

      Powertrain > Engine > Clear DTCs 

      Result

      Proceed to
      NEXT

    Post-procedure1

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

    Result: 

    NEXT 

    See step  35

  35. CHECK WHETHER DTC OUTPUT RECURS (DTC P050B-00) 
    NOTE:

    In this operation, the engine must be cold (approximately the same as the engine coolant temperature recorded in the Freeze Frame Data).

    Pre-procedure1

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

      Powertrain > Engine > Data List 

      Tester Display
      Coolant Temperature
    • Put the engine in Inspection Mode (for measuring Exhaust Gas).

      Powertrain > Hybrid Control > Utility 

      Tester Display
      Inspection Mode
    • 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.
    • Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
    • Perform the All Readiness.

      Powertrain > Engine > Utility 

      Tester Display
      All Readiness
    • Input the DTC: P050B-00.
    • Check the DTC judgment result.

      Result

      Result Proceed to
      NORMAL
      (DTCs are not output)      		 A
      ABNORMAL
      (P050B-00 is output)      		 B

    Post-procedure1

    • None

    Result: 

    A 

    END 

    Result: 

    B 

    See step  36

  36. 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.

      HINT: 

      Refer to ELECTRONIC CIRCUIT INSPECTION PROCEDURE [09/2023 - ]

      Repair any problems.

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  37

  37. CLEAR DTC 

    Pre-procedure1

    • None
    • Clear the DTCs.

      Powertrain > Engine > Clear DTCs 

      Result

      Proceed to
      NEXT

    Post-procedure1

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

    Result: 

    NEXT 

    See step  38

  38. CHECK WHETHER DTC OUTPUT RECURS (DTC P050B-00) 
    NOTE:

    In this operation, the engine must be cold (approximately the same as the engine coolant temperature recorded in the Freeze Frame Data).

    Pre-procedure1

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

      Powertrain > Engine > Data List 

      Tester Display
      Coolant Temperature
    • Put the engine in Inspection Mode (for measuring Exhaust Gas).

      Powertrain > Hybrid Control > Utility 

      Tester Display
      Inspection Mode
    • 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.
    • Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
    • Perform the All Readiness.

      Powertrain > Engine > Utility 

      Tester Display
      All Readiness
    • Input the DTC: P050B-00.
    • Check the DTC judgment result.

      Result

      Result Proceed to
      NORMAL
      (DTCs are not output)      		 A
      ABNORMAL
      (P050B-00 is output)      		 B

    Post-procedure1

    • None

    Result: 

    A 

    END 

    Result: 

    B 

    See step  39

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

    Pre-procedure1

    • Disconnect the mass air flow meter sub-assembly connector.
    • Disconnect the ECM connector.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      C13-3 (VCC) - C26-73 (VCVG) Always Below 1 Ω Ω
      C13-1 (FG) - C26-75 (VG) Always Below 1 Ω Ω
      C13-2 (E2G) - C26-74 (E2G) Always Below 1 Ω Ω
      C13-3 (VCC) or C26-73 (VCVG) - Body ground and other terminals Always 10 kΩ or higher kΩ
      C13-1 (FG) or C26-75 (VG) - Body ground and other terminals Always 10 kΩ or higher kΩ
      C13-2 (E2G) or C26-74 (E2G) - Body ground and other terminals Always 10 kΩ or higher kΩ

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  40

  40. REPLACE MASS AIR FLOW METER SUB-ASSEMBLY 

    HINT: 

    • Refer to REMOVAL [09/2023 - ]
    • If the result of the inspection performed in step 10 (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.

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  41

  41. CLEAR DTC 

    Pre-procedure1

    • None
    • Clear the DTCs.

      Powertrain > Engine > Clear DTCs 

      Result

      Proceed to
      NEXT

    Post-procedure1

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

    Result: 

    NEXT 

    See step  42

  42. 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).

    Pre-procedure1

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

      Powertrain > Engine > Data List 

      Tester Display
      Coolant Temperature
    • Put the engine in Inspection Mode (for measuring Exhaust Gas).

      Powertrain > Hybrid Control > Utility 

      Tester Display
      Inspection Mode
    • 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.
    • Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
    • Perform the All Readiness.

      Powertrain > Engine > Utility 

      Tester Display
      All Readiness
    • Input the DTC: P050B-00.
    • Check the DTC judgment result.

      Result

      Result Proceed to
      NORMAL
      (DTCs are not output)      		 A
      ABNORMAL
      (P050B-00 is output)      		 B

    Post-procedure1

    • None

    Result: 

    A 

    END 

    Result: 

    B 

    REPLACE ECM. Refer to  REMOVAL [09/2023 - ] 

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