How to Modify Hall Speed Measurement for Yixiantong Instrument Cluster?
2 Answers
Confirm the synthesizer's number. With the machine in normal mode (digital tube displaying "8888"), press the SETUP button to enter the programming state for the first channel. Press the CHANNELS button to proceed to the settings for the next channel. To finish programming, press the SETU button to save the settings and exit programming mode. After completing the settings, press the SETUP button to save the setting data. The machine will display the normal working mode with the digital tube showing "8888".
Last time I spent half a day modifying the Hall speed sensor for my old Jetta. The one-wire instrument cluster originally receives ABS wheel speed signals, so you need to locate the original vehicle speed signal wire first, usually near the instrument panel connector. You should choose a high-temperature resistant three-wire Hall sensor and install it near the transmission output shaft, using AB glue to fix the magnet on the driveshaft. Connect the signal wire to the back of the instrument panel, and add a 1K resistor in series on the positive pole to prevent interference. The most critical issue is signal compatibility - the original vehicle uses pulse signals, while the Hall output waveform might not be compatible, requiring a transistor to create a signal shaping circuit. After modification, use a diagnostic tool to check if the RPM data stream is synchronized. If the needle shakes, you'll need to adjust the filter capacitor. This job really requires basic circuit knowledge - if done improperly, you risk burning out the instrument cluster, which would be a huge loss.
