ME1788 Fault Diagnostic System

Engine managerial system constantly monitors the sensor,actuator,the relative circuit,fault indicator light and battery’s voltage etc.and even ECU itself and makes the reliability inspection on the sensor’s output signal,actuator’s driving signal and internal signal.If any fault is found in any part,or any signal is unreliable,ECU sets up the fault information records in the fault memory,which are stored in the form of DCT in the time order.According to the appearance frequency,the faults can be divided into“Stable Fault”and“Occasional Fault”.(https://www.daowen.com)