What Causes the Steering Gear Failure in BYD Tang?
1 Answers
The steering gear failure in BYD Tang is caused by loose or detached connectors. Below are relevant details about the steering gear failure in BYD Tang: Symptoms of BYD Tang steering gear failure include: difficulty in steering wheel returning to center; steering wheel shaking or veering off; uneven steering wheel resistance (heavy on one side, light on the other); steering gear oil leakage; and abnormal noises from the steering gear. The steering gear amplifies the force transmitted from the steering wheel to the steering linkage and alters the direction of force transmission. It can be classified into various types based on structural design. Taking the BYD Tang 2021 2.0T Automatic Flagship model as an example, its body dimensions are 4870mm in length, 1940mm in width, and 1720mm in height, with a wheelbase of 2820mm. It features front-wheel drive, a front MacPherson independent suspension, and a rear multi-link independent suspension. Solution: First, check if the connectors are loose or detached, particularly the motor and ECU connectors. Upon inspection, the connectors were found to be normal and fault-free. Then, use VDS1000 to check for any motor-related upgrade items. After scanning, three fault codes were detected in the electronic power steering system: torque sensor fault; steering angle signal fault; and motor overcurrent fault. Analyze the commonalities among these three faults. From the third fault, it appears to be caused by poor grounding. By consulting the circuit diagram, it was found that these three faults intersect. Upon locating the motor grounding point, it was discovered that the presence of electrocoating at the screw caused poor grounding. After grinding and reassembly, the fault persisted. Upon re-reading the fault codes, the motor overcurrent fault still existed. Initially thought to be a motor fault, but upon rechecking the grounding point, a protrusion was found at the grounding weld point. Further inspection revealed only one contact point on the wire clamp's attachment surface, confirming poor grounding.
