In case of connection lose, the outlet voltage drops to 0, and the control unit can not distinguish connection break and short-circuit with ground potential.Ī typical sample: light control modules, in case of damaged bulb some diagnostic tools show error message (accordingly to it’s description): short circuit to ground, but of course, there is no short circuit. A typical situation: the sensor and/or actuator is connected to control unit, second/other it’s power wire is plugged in to power source (+5 or +14V). Unfortunately also such simple situations can have exceptions. ![]() Accordingly, if the error message shows, that connection with some sensor is damaged, we could believe in that. The simplest, because no external conditions, no other devices affect it. This is the simplest section of self diagnosis – the module controls connection circuits of devices connected to it, their continuity and short circuits. Lists of error messages in modern vehicles contains thousands, even tens of thousands error message positions.Ĭontrol of sensor and actuator connection circuit. ![]() ![]() Each module of system continuously controls the sensors, actuators, working ability of different modules, in case of problems the system records error messages and/or modifies the operation algorithm, to ensure (as much as possible) performance without interruptions and in max high quality. Vehicle self diagnostics is developed to facilitate the finding of defects in vehicle electronics systems.
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