2 pin 4510840 Connector Cable Wire Harness Connector Housing Plug 2.8 Series

2. Data flow analysis

When the engine is running, the process of using the fault detector to display the control parameters and calculation results inside the vehicle ECU on the screen of the detector one by one in the form of data tables and serial output is called data flow analysis, also known as "Data Communication" "Data Transfer" or "Read Data Block".

The data displayed by the data stream mainly includes signal parameters such as oxygen sensor, engine speed, fuel injection pulse width, air flow, throttle opening, idle speed, battery voltage, ignition advance angle, coolant temperature, and intake air temperature. The working parameters of the sensors and actuators of the automotive electronic control system have certain standards and ranges. Through data flow analysis, the instantaneous value of the output signal voltage of various sensors, the calculation and judgment results inside the ECU, and the control signals of various actuators can be analyzed. Displayed at a glance on the detector screen. According to the engine operating status and the change of the transmission data, it can be judged whether the control system is working normally. By comparing the transmission data under specific working conditions with the standard data, the fault type and fault location can be accurately judged.

monitor actuator

Monitoring the actuator refers to the manual control of the actuator (such as the fuel injector, idle motor, relay, solenoid valve, cooling fan motor, etc.) It is used to judge whether the working condition of the actuator and its control circuit is good.

When performing an action test on the idle motor in the state of engine idle speed, its opening can be controlled. As the idle motor controls the opening of the throttle valve (or bypass air passage), the engine idle speed should increase or decrease accordingly. Reduced, through the test can determine whether the idle motor and its control circuit is normal. Similarly, the fuel pump relay can be monitored when the engine is running, and the engine should stop running soon when a control command to disconnect the fuel pump relay is issued.

When the engine is running, if you touch the fuel injector with the hand to feel the vibration or the engine speed does not decrease after the command to stop the fuel injection of a certain fuel injector is issued, it means that the control circuit is faulty; when the control mode is set When it is in the closed-loop control mode, the system will implement closed-loop control on the air-fuel ratio A/F, and the signal of the oxygen sensor will play a role. Gas dilute) flashes alternately, indicating that the closed-loop control system is normal. If the red indicator light is always on and not flashing or the green indicator is always on and not flashing, it means that the oxygen sensor is invalid.

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