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A80 Pro Intelligent Diagnosis System
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be mounted in the air filter or in the measuring tube of the air guiding section. The measuring tubes
are available in a variety of sizes depending on the maximum air flow required by the engine. The
relationship between signal voltage and air mass flow can be divided into two signal ranges of
reverse and forward flow. In order to improve the measurement accuracy, the measurement signal is
correlated with a reference voltage derived from engine control. The characteristics of the
characteristic curve are designed such that the wire breakage can be detected during the diagnosis of
the repair shop, for example by means of engine control. To determine the intake air temperature, a
temperature sensor can be built in.
（5）Intake pressure sensor
The intake pressure sensor detects the absolute pressure of the intake manifold behind the throttle
and the valve. It detects the change of the absolute pressure in the manifold according to the engine
speed and the load, and then converts it into a signal voltage and sends it to the controller (ECU). The
ECU controls and corrects the fuel injection amount based on this signal voltage.
Note: The sensor pressure port should be perpendicular to the mounting surface. The maximum
angle between the sensor and the vertical direction should not exceed 60 degrees. The sensor should
not be installed after the air intake heating device (if equipped). It is forbidden to enter the sensor
during painting or cleaning.
（6）Accelerator pedal sensor
Unlike ordinary distribution pumps or in-line pumps, in diesel electrical control devices, the
driver's acceleration requirements are no longer transmitted to the fuel injection pump through the
cable or transmission rod system, but are learned by the accelerator pedal sensor and transmitted to
the power supply. Control the accelerator pedal. A voltage is developed in the accelerator pedal sensor
via a potentiometer based on the position of the accelerator pedal. The accelerator pedal position is
calculated from the voltage based on the MAP chart.
2. Common faults and elimination of electronic control system
Trouble shooting of common vehicle self-diagnosis systems
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