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Home >> Lexus >> 2018 >> LC 500 >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System - Diagnostic Codes (Coupe) (6 Of 7) >> SFI System >> DTC P26C6: Exhaust Flow Control Valve "A" Control Circuit Low; DTC P26C7: Exhaust Flow Control Valve "A" Control Circuit High; DTC P2BF9: Exhaust Flow Control Valve "B" Control Circuit Low; DTC P2BFA: Exhaust Flow Control Valve "B" Control Circuit High [05/2023 - ] >> Confirmation Driving Pattern
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Confirmation Driving Pattern

  1. Connect the Techstream to the DLC3.
  2. Turn the engine switch on (IG).
  3. Turn the Techstream 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.
  7. Idle the engine for 5 seconds.
  8. Turn the Techstream on.
  9. Enter the following menus: Powertrain / Engine / Active Test / Control the Exhaust Exterior Valve Angle.
  10. In the Active Test, wait for at least 20 seconds with the exhaust change valve opening position at 100%.
  11. In the Active Test, wait for at least 20 seconds with the exhaust change valve opening position at 0%.
  12. Enter the following menus: Powertrain / Engine / Trouble Codes.
  13. Read the pending DTCs.

    HINT: 

    • If a pending DTC is output, the system is malfunctioning.
    • If a pending DTC is not output, perform the following procedure.
  14. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
  15. Input the DTC: P26C6, P26C7, P2BF9 or P2BFA.
  16. Check the DTC judgment result.
    Techstream 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

    HINT: 

    • 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, perform the Confirmation Driving Pattern and check the DTC judgment result again.