Posted in Mitsubishi Colt P0603 – EEP ROM Malfunction MMC Colt Posted by admin Posted on September 26, 2020 FUNCTIONTo check whether the information such as the idle learned value and so on is stored in the memory of engine-ECU.TROUBLE JUDGMENTIgnition switch is in “ON” position. The latest learned data that was flashed while the ignition switch was in “OFF” position are not stored correctly.PROBABLE CAUSEFailed engine-ECUDIAGNOSIS PROCEDURESTEP 1. M.U.T.-III diagnosis codeReconfirmation of diagnosis code.Q. Is the diagnosis code set? Author: admin