RA GP125i, Руководство по обслуживанию

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OBD system introduction
Vehicle diagnostics system, referred to as OBD(On-Board Diagnostic). When the system fails, the fault light (MIL) or
the engine (Check Engine) warning light is lit, The OBD system will save the fault information into the memory and
read the related information in the form of a fault code through the standard diagnostic instrument and the diagnostic
interface. According to the indication of the fault code, the maintenance personnel can quickly and accurately determine
the nature and location of the fault.
1. Fault information record
The ECU continuously monitors sensors, actuators, related circuits, fault indicator lights and battery voltage, and even
the ECU itself, and to the sensor output signal, actuator drive signal and internal signal (such as lambda closed loop
control, cylinder temperature / coolant temperature, idle speed control and battery) Reliability detection is carried out by
voltage control, etc.
Once a fault occurs in a link, or a signal is not trusted, the ECU immediately sets up a fault information record in the
RAM's fault memory. The fault information record is stored in the form of a fault code. The fault code is called current