4 pin 7282-5595-30 Automotive Electrical Connector Terminals Housing Plugs

3.2.1 The skills of reading reading of automobile circuit diagram

(1) Three types of signals to distinguish the car circuit must understand the channel of the electricity, that is, what a signal is; this signal is input signal, output signal or control signal; what role does the signal play, what role does the signal play, what role does the signal play, what role does the signal play, what role does the signal play, what role does the signal play, what role does the signal play, what role does the signal play, what role does the signal function, what role does the signal play, what role does the signal play, what role does the signal function, what is the signal, what role does the signal play, what role does the signal function, what role does the signal function? Under what conditions, there are signals and signs from and where to go.

① Power: It is necessary to clearly provide the battery or the power supply after the central control box. The wire connected to the power supply positive electrode is the power supply circuit before reaching the electrical appliance; the wire connected to the ground is the grounding circuit before reaching the electrical appliance. The power supply of the automotive circuit generally has two types of constant power and conditions.

② Signal: What is common in automotive circuits is various switch input signals and sensor input signals. When analyzing the sensor circuit, we can use the exclusion method to determine the circuit, that is, to rule out its impossible function to determine its actual function, such as analyzing a sensor circuit with three wires, if its power circuit and grounding circuit have been analyzed, the power circuit and grounding circuit have been analyzed. The remaining circuits must be signal circuits.

③ Control: The control signal is mainly delivered by the control unit. It is distributed in various actuator circuits, such as the ignition signal in the ignition circuit, the fuel injection signal in the fuel injection control circuit, the control signal of the controlled compressor operation in the air conditioner control circuit, etc. Essence In the automotive circuit, we will see the situation of the actuator sharing power cords, ground lines and control lines.

(2) Circuitization is based on the three types of signals mentioned above, and then can be divided into power circuits (positive electrode power supply), grounding circuit (back to the negative electrode composition circuit), signal circuit according to the basic principles of the electrical system work), the grounding circuit ,Control circuit.

(3) Pay attention to the string and parallel relationship of each component when the string of the circuit is read correctly, especially the joint power line, the common ground line and the common control line of different components.

(4) The distinction between the wire function (can also be connected by feldling, connection) that is directly connected together must have a common function, such as the power cord, ground wire, signal line, or control line. Any set of wires that are connected without using electrical appliances are connected to a power supply or ground, then the wires are all power cords or ground wires.

(5) Determine whether the wires are commonly shared in the car circuit diagram, such as partial grounding and power supply. Some sensors often share power cords and ground wires, but they will never use signal lines. Some actuators will share the power cord and ground wire, and some will also share the control line.

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