General Information

On Board Diagnostic (OBD II)

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.

Malfunctions which only occur sporadically will be indicated on the display by the addition "/SP". The cause of sporadic malfunctions can be e.g. a loose contact or a brief open circuit. If a sporadic malfunction does not occur again within 40 engine starts, it will be erased from DTC memory.

The stored DTCs can be printed out/displayed by checking the DTC memory. DTC Memory Checking and Erasing

After malfunctions have been eliminated, DTC memory must be erased and the repair must be verified via the appropriate display group, Readiness code, generating.
DTC Memory Checking and Erasing
Monitors, Trips, Drive Cycles and Readiness Codes

The readiness code must be created each time the DTC memory is erased and when the voltage supply to Motronic Engine Control Module (ECM) -J220- is interrupted.