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speedometer not working on honda accord
Fault diagnosis:
First of all, during the road test, both the speedometer pointer and the odometer LCD counting system do not work, but the engine runs normally and the automatic transmission skips normally. Remove the instrument assembly, find the vehicle speed signal input terminal (blue/white line) without unplugging the wire side connector, drive it with an analog signal generator (Boan 8901 meter), the speedometer pointer displays the vehicle speed, and the mileage counter also operates. It is normal to install the replaced instrument ring for test.
It is preliminarily judged that the instrument assembly should be free of fault. The fault should occur on the vehicle speed sensor or vehicle speed signal line. According to the data, the speed sensor should be three-terminal Hall type, but the sensor was not found in the engine room. Because the vehicle is equipped with a multiplex transmission system, I don't know whether the speed signal is from the ABS or the automatic transmission system. Remove the multiplex transmission control device located in the driver's side instrument panel and check, and no abnormality is found. It is only found that the line with the same color as the speed signal line is input to the terminal B14 of the multiplex transmission control device. Reluctantly, reassemble the wire side connector pulled out during the test, connect the fault detector, lift the car military lift and read the data flow. At this time, a noticeable phenomenon is found that the vehicle speed signal can be read in the data flow. When gear D is engaged, the vehicle speed signal value can increase with the increase of the throttle opening, which means that the vehicle speed signal has entered the engine electronic control unit, There is no need to look for the so-called speed sensor. Why didn't the speedometer and odometer display the nickname? Try to enter the automatic transmission system and the brake anti-lock system, and you can also read the speed signal.
The sensor failure, the plug is not inserted firmly, and the circuit is broken, which will cause the speed mileage (ask for the bottom price | check the reference) and the meter will not go. There is another kind of failure of the speedometer. Only one of the speedometer and the odometer works. This is the internal circuit of the instrument or If there is a fault in the mechanical part, it can be carefully overhauled or replaced with a new speedometer.
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