With - BMW DIAGNOSTIC SYSTEM

BMW Service Tester:

BMW MoDiC:

The contents of the defect code memory can be read out with the BMW DIAGNOSTIC SYSTEM.

Description of BMW DIAGNOSTIC SYSTEM

Storage of Defect Codes:

Defect codes are stored after the engine has been started. If several defect codes are detected, they appear in the order they first occurred. The operating conditions as stored apply only to the conditions, under which the defect was detected for the first time. An intact voltage supply (charged battery) is the prerequisite for maintaining the memory contents.

Substitute values may be active if no malfunction can be found despite a defect code being stored. Troubleshooting should still, however, be carried out.

In US models, defects which influence the fuel/air mixture are indicated by a lamp (engine check) in the instrument cluster. As a check, this lamp lights constantly during the period of time between "ignition ON" and engine start.

If the defect code memory has no defect code stored although there is a defect in the vehicle, either the test conditions (e.g. temperature, time, load etc.) for defect code detection were not fulfilled or it was technically not possible to store a defect code. A list of monitored components and functions is given in - Component testing -.

Component Tests and General Diagnostics

Defect Code Memory Monitoring •D•900:

The first step should always be to monitor the defect code memory. If one or several defect codes are stored, it is advisable to print out these data immediately (R key). Since it is often necessary during the test procedure to cut the power supply or to disconnect the connector from the control unit, the contents of the defect code memory will be deleted unintentionally as a consequence.

The learned adaptation values are lost if the battery or the DME control unit is disconnected. This may result in difficulties in starting the engine or the engine may stall when idling. These problems are generally rectified after a short test drive.