P1298 – Variable Geometry Turbocharger Control System Malfunction (high pressure) Vehicles withvariable geometry turbocharger MMC L200 IV



FUNCTION

  • The engine-ECU controls the duty ratio of the variable geometry control solenoid valve so that the actual boost pressure can become the target boost pressure.

  • TROUBLE JUDGMENT

  • Engine is running
  • Actual boost pressure is higher than target boost pressure by more than 6.7 kPa

  • PROBABLE CAUSES

  • Failed variable geometry turbocharger control system
  • Failed engine-ECU

  • DIAGNOSTIC PROCEDURE

    STEP 1. Check the turbocharger supercharging pressure.

    Q. Is the check result normal?

    STEP 2. M.U.T.-III diagnosis code.

  • After clearing the diagnosis code through M.U.T.-III, start the engine and confirm whether the diagnosis code is set.
  • Q. Is the diagnosis code set?

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