Diagnostic device memory

The electronics of the control unit detects malfunctions in the injection system and in the ignition system, such as faulty sensors, disconnected plugs and loose contacts. These malfunctions in the form of codes are entered into the memory of the diagnostic device immediately after the first occurrence. At the same time, the check engine light on the instrument panel lights up to indicate that a fault has been stored in the memory. If the fault occurs only once, for example, due to loose contact, then the control lamp will go out, but the fault code will remain stored. In addition, the memory contains information about the frequency of occurrence of a malfunction. In a specialist workshop with a diagnostic tool connected to the diagnostic plug (located on the right in the engine compartment), read the stored fault codes and erase them.

If the engine or injection system does not work properly, it is recommended that you first interrogate the memory of the diagnostic device in a workshop with special diagnostic equipment.

All versions of the DME system have an emergency mode function: when the sensor fails, the control unit is guided by redundant (average) values given by the corresponding sensor. In the event of a failure of the air mass meter, the fuel metering control unit uses the throttle valve position versus engine speed data as base values. Such regulation is activated automatically and independently of the driver. The trip may continue, and engine performance often changes very little. At the same time, faults are recognized by the control unit and stored in memory.

Attention: When disconnecting the wires from the battery or when disconnecting the plug of the control unit, all fault codes are erased.