Computers and Control Systems: Description and Operation

Function
The Motronic Engine Control Module (ECM) -J220- for the fuel injection and ignition system is equipped with a Diagnostic Trouble Code (DTC) memory.

If malfunctions occur in the sensors and components being monitored, they will be stored in the DTC memory together with an indication of the type of malfunction.

The stored malfunctions are displayed after initiating the malfunction display.

After malfunctions have been eliminated, DTC memory must be erased, Erase DTC Memory (Function 05) and the repair must be verified via the appropriate display group. [1][2]Monitors, Trips, Drive Cycles and Readiness Codes

The readiness code must be created again after every time the DTC memory is erased and when the voltage supply to ECM -J220- is interrupted. [1][2]Monitors, Trips, Drive Cycles and Readiness Codes