Posted in MMC L200 P0605 – Read Only Memory (FLASH ROM) Malfunction MMC L200 IV Posted by admin Posted on September 28, 2020 FUNCTIONThe engine-ECU reads information from flash ROM.The engine-ECU detects checksum errors.TROUBLE JUDGEMENTIgnition switch is in “ON” position.In each inspection target area of a flash ROM, a checksum mismatch is detected three times consecutively.PROBABLE CAUSEFailed engine-ECUDIAGNOSIS PROCEDURESTEP 1. M.U.T.-III diagnosis codeAfter 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? Author: admin