1. Incorrect tire size: If your tires are larger than the size specified by the manufacturer, your speedometer will read higher than your actual speed.
2. Faulty speedometer cable: The speedometer cable is responsible for transmitting the rotation of the transmission to the speedometer head. If the cable is damaged, stretched, or disconnected, it can cause the speedometer to read incorrectly.
3. Faulty speedometer gear: The speedometer gear is located in the transmission and connects the transmission output shaft to the speedometer cable. If the gear is damaged or worn, it can cause the speedometer to read incorrectly.
4. Faulty speedometer head: The speedometer head is the component that displays the vehicle's speed. If the head is damaged or malfunctioning, it can cause the speedometer to read incorrectly.
Diagnosis and Repair:
To diagnose the problem, you will need to determine which component is causing the inaccurate reading.
- Check the tire size.
- Disconnect the speedometer cable from the speedometer head, and check for damage or stretching.
- Check the speedometer head.
Once the faulty component has been identified, you can replace the part, the speedometer head, or the cable.
