General description of the self-diagnostic system (Hyundai Elantra J1)

Contents: Self-diagnosis function ⇓ Limited operation mode ⇓ Possibility of adaptation or…⇓ Self-diagnosis system indicator lamp ⇓ Location of the self-diagnostic…⇓

The vehicles are equipped with an MPI engine management system, which controls the primary ignition circuit, fuel injection and engine idle from a single control unit.

Self-diagnosis function

Each electronic control unit has a self-diagnostic capability, in which the electronic control module continuously monitors signals from certain sensors and engine actuators and compares each signal with a table of programmed values. If the diagnostic system software detects a fault, the electronic control module stores one or more fault codes. Fault codes will not be stored if there are no codes for individual component faults or conditions exist that are not covered by the diagnostic system software.

In the MPI system, the electronic control unit issues 2-digit fault codes for reading either using a fault code reader or by "manual" methods, using flash codes.

Limited operation mode

Our system uses the limited operation mode function (a function often referred to as emergency mode). When specific faults are identified (not all faults cause the limited operation mode to start), the electronic control module starts the emergency mode and will be guided not by signals from sensors, but by programmed values. This allows the car to safely reach the place of diagnostics and/or repair. Once the fault is corrected, the electronic control module will return to normal operation.

Possibility of adaptation or "training"

The system also uses an adaptive function that modifies the basic programmed values for the most efficient operation under normal conditions and with engine component wear.

Self-diagnosis system indicator lamp

The car is equipped with a self-diagnosis control lamp located on the instrument panel. If the lamp lights up while the engine is running, this means that the electronic control unit has diagnosed a malfunction in the system. The test lamp can also be triggered to output flash codes.