Posted in Mitsubishi Colt P1974 – Cyclic RAM Test (Engine) MMC Colt Posted by admin Posted on September 26, 2020 FUNCTIONMonitor engine-ECU calculation.Monitoring is performed periodically.TROUBLE JUDGMENTIgnition switch is “ON” position. The (engine) RAM data of engine-ECU is abnormal.PROBABLE CAUSEFailed engine-ECUDIAGNOSIS PROCEDURESTEP 1. M.U.T.-III diagnosis codeAfter clearing the diagnosis code through M.U.T.-III, ignition switch is “ON” position and confirm whether the diagnosis code is output.Q. Diagnosis code set? Author: admin