What Is EPS?
EPS (electrically assisted steering) is an example of the automotive industry's gradual shift from hydraulic steering to electric systems.
One of the main reasons for moving from hydraulic to electronically controlled steering is rising fuel consumption.
The EPS system operates efficiently at low vehicle speeds and under higher performance demands, making it more fuel-efficient than hydraulic systems.
The operating principle of the EPS system: the electronic control unit (ECU) calculates the assist force required based on torque applied to the steering wheel, vehicle speed, and steering wheel position.
As with high-end vehicles that have multiple ECUs, a module inside the steering column controls and manages the electronic system.
It is housed as a single unit inside the electric motor. It communicates with other modules via the CAN bus data network and regulates system operation based on signals from sensors.
EPS Fault Symptoms
If the EPS warning light is on and the steering feels heavy, the vehicle has an EPS fault.
This has become a chronic issue, especially on Opel vehicles.
The fault occurs when the electric steering pump no longer functions properly and the module on the vehicle stops working.
Electric Steering System Repair
In electric steering systems, an electric hydraulic pump replaces the conventional hydraulic pump.
The electronic steering pump must either be reprogrammed or replaced. Various programming tools are available for these procedures.
If you simply replace the electric steering pump directly, it still will not work.
You need to read the file from the old steering pump and write it to the new one.
Opel/GM EPS Programming
EPS faults have become chronic on Opel vehicles; in steering pump failures, the EPS module — the electronic steering pump — is replaced.Ioterminal ECU programming tool makes electronic steering pump replacement straightforward.
You can read the software from the old steering pump and write it to the new one.
Supported ECUs
EPS BOSCH 70F3187+95080 — 70F3187 FLASH R/W, 95080 EEPROM R/W. CAN (OBD).
