Fault detection
    First road test, odometer pointer and LCD counting system does not work, but the engine is running normally, variable speed jump block is also normal. (Blue and white), the analog signal generator (Boan 8901 table) drive, the pointer shows the mileage and the counter is running. Install the old instrument test is also normal. Preliminary judgment instrument assembly without trouble. The fault should occur on the vehicle speed sensor or signal line. Then look for the speed sensor. Access to information, this sensor should be a three-wire Hall-type speed sensor, but found the engine compartment did not see this sensor, this time some confusion. Because this car is equipped with CAN-BUS system, I do not know whether the speed signal is used for ABS system, automatic transmission system or engine system.
    Remove the driver side of the multiplex control device to check and did not find the problem. Just to find the line with the odometer signal line, it does enter the B14 terminal of the multi-channel transmission system. Helpless, re-installed well, then repair the king of diagnostic apparatus, this time found a noteworthy phenomenon, in the data stream can read the speed signal, this time the vehicle is raised. Hanging on the D block, the speed signal can be increased with the throttle increased, which shows that there have been speed signal into the engine computer inside. There is no need to find the so-called speed sensor. Why can not the odometer show? Try to enter the automatic transmission system and anti-lock system, can read the speed signal, which is why? At this point we are stalled.
    Re-access to information in the wide computer terminal data that found in the 32-pin 9 head (blue and white) is to send speed sensor signal, and 16-pin 10 head for the middle shaft speed sensor (blue line), the detection Is the intermediate speed signal. At this point to understand, in the automatic transmission system with Guangzhou Honda Accord did not load speed sensor, but only manual transmission models were equipped with speed sensors. In the automatic transmission model is taken to detect the speed of the automatic transmission countershaft, and then converted by the engine computer out of the speed signal, it is output through the 9th head to the system.
    Troubleshooting
    From the dashboard along the speed signal line to detect the wiring harness directly connected to the engine computer No. 9 head, is the engine computer problems? But the price is not expensive and easy to change. Re-along the engine computer 9 speed signal output line, found that the line into the dashboard, the driver side of the multi-channel transmission device, cruise system, anti-lock system. Try to turn off the speed signal line in the above device and find that the dashboard speed indication is normal when the blue and white line in the cruise system is disconnected. At this point the fault has been clear on the cruise computer. Because the cruise computer damage and directly affect the speed signal output. At this point the driver remembered this car cruise system has long been easy to use, there is no repair. So off to the cruise computer in the blue and white line, which is the engine computer output signal line, troubleshooting! Install the vehicle, and restore the old dashboard, road test everything is normal.
    Fault summary
    After this failure to recognize the importance of information in modern vehicle maintenance. Now with the CAN-BUS system is widely used, the vehicle computer system share a signal, when a system failure, should be fully thought of the system of the system The relationship between the role. In this model, the vehicle speed sensor cars are equipped with manual transmission, and equipped with automatic transmission AT is not the sensor. This is the car repair time is a major reason!