P0643 – Analog Sensor Reference Voltage No. 1 Too High MMC L200 IV



FUNCTION

  • The engine-ECU applies 5 V to the accelerator pedal position sensor (main).
  • The engine-ECU checks whether the supply voltage is within the specified range.

  • TROUBLE JUDGEMENT

  • Battery positive voltage is 8 -16 V
  • 2 seconds later after the ignition switch has been in “ON” position or the engine has started up
  • The detected voltage of analog sensor reference voltage No. 1 is 5.14 V or more for 0.5 second. [Power supply for accelerator pedal position sensor (main)]

  • PROBABLE CAUSE

  • Failed engine-ECU

  • DIAGNOSIS PROCEDURE

    STEP 1. M.U.T.-III diagnosis code

  • After erasing the diagnosis code through M.U.T.-III, ignition switch is “ON” position and confirm whether the diagnosis code is stored.
  • Q. Is the diagnosis code stored?

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