What's the matter with the Honda meter unit failure?
2 Answers
Usually, it is due to poor contact of the meter unit connector or aging wiring, which may be bitten off by rats, resulting in an open circuit between the high and low ends of the meter unit. Meter unit short circuit fault: If there is a short circuit between the high and low ends of the meter unit, it may be caused by rainwater entering and causing a short circuit. It is recommended to unplug the connector and let it air dry. After a short circuit, the meter unit itself will lose current and will not perform work again, remaining in its original normally open or normally closed state. Meter unit ground short circuit fault: This situation occurs when the low end of the meter unit is grounded, meaning the 3.5V control line is shorted to ground. The current of the meter unit reaches its maximum, and the ECU will no longer be able to control the meter unit. If it is a normally closed meter unit, it will open all oil passages, leading to high-pressure fuel rail pressure limitation or engine shutdown.
The instrument cluster unit in Honda vehicles, which controls the display of speed, RPM, and other indicators, can malfunction. I've encountered this issue a few times while driving older Honda models. Common causes include lost sensor signals or poor circuit connections. For example, if the speed sensor loses its signal, the speedometer needle will stop moving; a blown fuse can cause the entire display to go black, making it impossible to see anything. Additionally, aging internal components of the control module, especially under high temperatures or rough road conditions, can lead to failures. This has a significant impact—without visibility of speed during driving, it's easy to exceed speed limits or misjudge conditions. A quick fix is to pull over, turn off the engine, and wait a moment; sometimes, a power reset can restore normal function. However, if the issue persists, it's essential to visit a professional workshop for diagnosis. They use specialized computers to read fault codes and accurately identify the problem, as ignoring it can compromise driving safety. Remember to have the instrument cluster wiring checked during regular maintenance to minimize such issues.
