How to Fix a Broken Tachometer in Mitsubishi Pajero?
3 Answers
If the tachometer in a Mitsubishi Pajero is broken, it cannot be repaired and must be replaced. The advantages of the car tachometer's operation are as follows: 1. High static torque, the pointer is not prone to shaking, and it has strong anti-vibration performance; 2. It uses a single-chip microprocessor through software design, so it has high precision and strong anti-interference capability; 3. The hour meter uses LCD display, without mechanical parts, making it more reliable and modern. Extended content: The working principle of the car tachometer is that the tachometer receives digital pulse signals (sent by the sensor), processes them, and directly reads them into the CPU's counting port. The software calculates the speed and the corresponding position of the pointer, then through the CPU's control port, amplifies and drives the stepper motor to rotate in both positive and negative directions, indicating the corresponding speed value (the pointer is directly installed on the rotating shaft of the stepper motor). Each step of the stepper motor is only 1/3 degree.
My Pajero's tachometer also went bad before, which was quite annoying. Start with the simple checks first: a dirty or faulty engine speed sensor is the most common issue. Open the hood, locate the sensor, and clean any oxidized connectors. If there's no change, check the corresponding fuse in the fuse box—it might be blown, causing signal interruption. Spend some time replacing it with a new fuse. If that doesn't work, the issue could be loose or faulty wiring in the dashboard. I once fixed it myself by unplugging and re-plugging the connectors tightly, which sometimes helps. But if it still doesn't work, don't force it—take it to a reliable repair shop for professional diagnosis. After all, a faulty tachometer affects shift timing and engine health, so addressing it early ensures safer driving. If you encounter similar issues while driving, pay attention to the engine sound to help gauge the RPM and ensure the vehicle doesn't stall.
Friends who enjoy tinkering with their cars can find a sense of accomplishment in fixing tachometer issues. I first used a multimeter to test the circuit voltage and located the sensor near the engine. Then, I removed the connector to check for rust or damage—cleaning or replacing the part if oxidation was found. If the issue lies in the instrument circuit, you might need to dismantle the dashboard to fix internal faults. Refer to online diagrams for guidance and replace parts yourself, being careful not to damage the wiring. However, if tests show no signal transmission, it could be an ECU-related problem, and I recommend consulting a professional mechanic with diagnostic tools for a more accurate assessment. When DIY-ing, prepare gloves and tools to avoid rushing and making mistakes. Handling it properly can save money and teach you new skills. Regularly inspect sensors to prevent dust buildup.
