Where is the longitudinal acceleration sensor located?
2 Answers
The longitudinal acceleration sensor is located on the inner side of the car tire. Symptoms of its damage include: 1. Inability to prevent tire lock-up during emergency braking, posing a safety hazard; 2. The ABS warning light will illuminate, and the brake pads may not reset. Causes of longitudinal acceleration sensor damage are: 1. ABS wheel speed sensor malfunction; 2. ABS wiring connection issue; 3. ABS control unit programming error; 4. ABS master cylinder failure. The functions of the longitudinal acceleration sensor include: 1. Maximizing brake efficiency, reducing braking time and distance; 2. Effectively preventing vehicle skidding and fishtailing during emergency braking, ensuring good driving stability; 3. Allowing steering during emergency braking, providing excellent steering control; 4. Avoiding severe friction between tires and the ground, reducing tire wear.
Last time I helped a friend fix his car, I took this thing apart. The longitudinal acceleration sensor is usually hidden in the middle of the chassis or behind the firewall. In some cars, it's directly mounted on the transmission housing. This little gadget, resembling a small matchbox, is specifically designed to monitor G-forces during sudden acceleration or deceleration. If you're looking for it, first check the service manual for its exact location—German cars often hide it under the passenger-side floor, while Japanese models might have it attached to the central tunnel. However, in newer models, it's integrated into the ESP control module, making it inaccessible to the average car owner. A word of caution: always disconnect the battery before unplugging it. This sensor is extremely sensitive—even static electricity can cause data drift.
