Three facts about modern electric power steering

Three facts about modern electric power steering

EPS has enabled key vehicle advancements like stop/start systems, hybrids and advanced driver assistance features or ADAS.

For over 20 years, electric power steering or EPS has been a solution first adopted in smaller cars but now is the “go-to” steering assist technology for trucks, large sedans and EVs. EPS has enabled key vehicle advancements like stop/start systems, hybrids and advanced driver assistance features or ADAS. Let’s explore three important facts about the evolution of modern EPS systems.

EPS has also seen significant improvements over the years. Early systems often overheated during extended parking maneuvers, and many drivers disliked the altered steering feel. Modern systems, however, have been refined to the point where they can even steer the vehicle autonomously.

The biggest change has been in the electric power steering control module’s connection with the vehicle.

Fact number one – the EPS control module is part of the vehicle’s Hi-speed CAN bus, communicating with modules like the engine control unit, ABS and body control module. This integration allows the sharing of data like vehicle speed, steering angle and engine operation between systems. The EPS can even work with stability control to apply brakes and steer the vehicle. The shared data can solve mechanical problems like torque steer experienced by front-wheel-drive vehicles and even pulls due to road crown or misaligned toe.

Fact number two – EPS systems can’t be fixed simply by replacing parts. The rack and module can be very expensive to replace, and steering angle and torque sensors are difficult to swap due to their location on the steering column.

The best diagnostic approach is to examine the inputs, codes and network using a scan tool before conducting a physical inspection of the components. It’s important to review the data from the sensors to ensure they are not providing the wrong information. Additionally, check the other modules on the CAN bus to confirm they are communicating. Missing data, such as vehicle speed or yaw, can cause the system to enter a fail-safe mode.

Fact number three – EPS systems use a brushless electric motor, powered by a 9- to 16-volt signal, to move in both directions. A rotational sensor determines the motor’s position. If the module is replaced or the toe adjusted, the steering system’s end stops must be relearned to prevent overextension, in addition to calibrating the steering angle sensor.

The motor can be attached to the steering rack or column, with many modern vehicles having it mounted to the base of the steering gear on the rack. It connects using a screw-like mechanism or a high-strength belt.

The motor is generally non-serviceable, with gear lash and belt tension set at the factory. Removing the motor may also void the core charge.

Don’t forget to follow us on Instagram and Facebook and subscribe to our YouTube channel for more tire, service and shop operations videos.

You May Also Like

Important tips for wheel bearing service

Complaints like exhaust leaks to tire balance issues to vague statements like “it just doesn’t sound right” may mean bad wheel bearings.

TR-Continental-Important-tips-for-wheel-bearing-service

As technicians, noise complaints are among the toughest challenges you deal with. To accurately assess the issue, you likely ask customers detailed questions like – is the noise present when the car is stationary or moving? Does it change when cornering or under different loads? Is it a growl, squeak, groan or rattle? Wheel bearing noise is one of the toughest issues for customers to describe, often developing so gradually that they may not notice it until it's pointed out during an unrelated road test. Complaints ranging from exhaust leaks to tire balance issues to vague statements like "it just doesn't sound right" may be bad wheel bearings. In this video, let’s discuss some important steps to remember when servicing wheel bearings.

SUV/CUV tires continue to grow and adapt

Ask the customer questions to learn their routine and the type of performance they look for in CUV or SUV tires.

TR-Continental-SUV-and-CUV-tires-continue-to-grow-and-adapt
Four important scan tool components

Considering a scan tool should involve a review of the internal and external components that impact the unit’s performance and durability.

TR-Continental-Four-important-scan-tool-components
Preparing your shop to service larger-sized rims

While large rims may enhance the appearance and performance of customers’ vehicles, it poses challenges for your shop.

Why you should recommend a ‘tune-up’ to your customers

Because of automated systems, many people overlook the basic maintenance that’s still required to keep vehicles running smoothly.

Other Posts

Continental equips the Chevrolet Traverse with OE tires from its CrossContact series

Continental received worldwide original equipment (OE) approval for the CrossContact LX 20 in 20 and 22 inch sizes.

Continental_PP_Crosscontact-lx20
Sonic Tools USA offers tools to beat back the technician shortage

Andrew Coccari, VP of Sales and Marketing at Sonic Tools USA, delves into the causes of the technician shortage and offers some novel solutions to address the need for help around the country.

WT YT-Sonic-Tools-1400
Five tips for your next wheel bearing job

These practical tips are designed to save you time and frustration, ensuring a smooth, noise-free outcome for your customers.

tech iq
Sally Thomas taps into her tenacity to build on the success of her family’s tire business

Today, Sally Thomas and her brother, Bryan, operate eight retail stores, two commercial locations, three wholesale distribution warehouses, a Mighty Auto Parts franchise, and an e-commerce business.

sally-thomas-1400-REV