![]() If the caster angle is too far out of specification, the damper mode can over or under compensate. Damper control mode: Used to improve road feel and dampen kickback, this mode typically kicks in at higher vehicle speeds.If the steering position sensor is faulty, it can cause “on center” problems when the toe is set. Feedback from the steering position sensor prevents the EPS system from “overshooting” the center position. Return mode: Used to assist steering return after completing a turn.Normal mode: Left and right assist is provided in response to inputs and vehicle speed.By understanding the four modes, you can make a diagnosis in less time. The Cobalt’s EPS system has four modes of operation. A warning light will illuminate to alert the driver, and the driver will notice a significant increase in steering effort when turning the vehicle. If a sensor or other component in the EPS system fails, the self-diagnostics should detect the fault, set a code and disable power-assist. The control module then commands the motor to rotate a certain amount, and a sensor on the motor provides feedback to the control module so it can monitor the motor’s position. Other inputs, such as vehicle speed and inputs from the traction control or stability control systems, are factored in to determine how much steering assist is required. This information, along with input from a steering torque sensor mounted in the steering shaft, is fed to the power steering control module. When the driver turns the wheel, a steering sensor detects the position and rate of rotation of the steering wheel. Getting rid of the hydraulics also does away with leaks and the need to check the power steering fluid. This improves fuel economy while also eliminating the weight and bulk of the power steering pump and hoses. Knowing the basics of this system can save you problems before the vehicle is pulled into the alignment bay.ĮPS eliminates the power steering pump, which can use as much as 8 to 10 horsepower under load. Electric Power Steering (EPS) The greatest difference in the 2005 Chevy Cobalt can’t be seen from under the car.
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