EPS pump diagnosis and repair
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Diagnosis and Repair of Power Steering Rack Electric Pump
The electro-hydraulic steering mechanism combines the properties of its two predecessors: hydraulic and electric power steering systems. As in conventional hydraulics, fluid moves the steering rack rod using a piston. However, the pressure in the system is created not by a mechanical pump driven by the engine pulley, but by an electric motor. Restoration of power steering pumps in Warsaw is a sought-after service by STS.Parts.
How to Recognize a Damaged Electric Power Steering Pump
The electric pump is controlled by electronics, allowing it to be used only during turns, thus saving energy and fuel. At the same time, the electronic components of this device can become a major problem, as the control board is installed directly on the pump, close to the oil reservoir. Therefore, leaks in the electric pump usually lead to its failure.
The main sign of pump malfunction is a yellow or red steering wheel icon on the dashboard. But even before that, other symptoms may indicate the same problem:
- Strange noises (humming, squealing) from under the hood
- Steering wheel binding when turning
- Steering wheel jerks
- Increased steering effort
All these are reasons to visit a workshop, preferably with us at STS.Parts.
Electric Power Steering Pump Restoration Process
Power steering pump repair in Warsaw takes place in several stages:
- Diagnostics using a scanner
- Removal of the pump from the vehicle
- Washing and cleaning in a sandblasting unit
- Disassembly with removal of the pump's main elements
- Removal of the electronic unit and its diagnosis
- Cleaning and checking all electronic components
- Restoration of the power steering pump in Warsaw using repair kit parts
- Assembly of the electric power steering pump
- Testing it on a pressure stand
- Installing the pump back on the vehicle
If for some reason the restoration of the power steering pump in Warsaw is not possible, we offer the client a repaired similar unit from our large exchange fund.
Vehicles for Which We Repair Pumps
Our company repairs electric steering rack pumps for any vehicles that use them. These include popular car brands and models such as:
- Ford Mondeo
- Audi A1
- Opel Astra H
- Mercedes-Benz Vaneo
- Citroen C5
- Dacia Duster and many others. We have restored units manufactured by TRW, KOYO, LuK, HPI, and all auto parts suppliers. STS.Parts provides a 6-month warranty on all our work, units, and spare parts. We ship pumps, other units, and spare parts to any location in the country.
Problem: The owner of the Chinese version of the Volkswagen ID.4 faced a major limitation in Europe—the non-standard charging port and single-phase charging system made the car difficult to use and rendered travel inconvenient and unreliable
Problem: The owner of a Li Auto L7 hybrid vehicle imported from China was unable to connect the car’s factory-installed multimedia system to the internet in Europe using the factory-installed Chinese eSIM. This negatively affected the performance of the navigation system and online services and prevented software updates.
Problem: The 2022 Fiat 500e (2020) electric car was purchased at an auction in France and transported to the STS workshop in Warsaw by tow truck. The reason was a completely discharged high-voltage battery, causing the battery management system (BMS) to enter deep protection mode and the vehicle to stop accepting a charge. The situation was complicated by a critical BMS error caused by the deep discharge. As a result, the electric vehicle would not start, and standard software recovery procedures were ineffective.
Problem: The owner of a second-generation Nissan Leaf contacted STS.Electro with a complaint: the car only charges from a fast charging station, but does not accept a slow charging gun (Type 1).
Problem: We were contacted by the owner of a Peugeot e-208 electric car. After charging to almost 100%, the electric car stopped accepting a charge, and the system displayed a second-level overvoltage error.
Problem: The owner of a Karma Revero hybrid was unable to drive his car for over eight months: the engine would only start for a few minutes at a time, and the battery would not charge.
Problem: The Dacia Spring car would not start or charge due to a reversed battery polarity and a faulty DC/DC+charger unit.
Problem: A well-known logistics service provider brought in three electric vans for repair after their high-voltage batteries failed. In one of them, the battery was dismantled.
Problem: The high-voltage battery is discharged and cannot be charged. The car does not accept a charge because the electronics do not recognize the connection of the charging gun.
Problem: A sharp drop in driving range and the vehicle switching to emergency mode with reduced power (“turtle mode”).
Problem: The Tesla Model 3 was in limp mode, displaying the message “Drive system requires service” and limiting the speed to 103 km/h. The on-board diagnostics did not indicate a clear cause for the malfunction.
Problem: A 2016 Tesla Model S equipped with a Tesla Base electric motor was brought to the STS workshop for repair. During operation, powertrain errors related to insulation failure occurred. The cause was a coolant leak into the electric motor due to loss of seal tightness.
Problem: The owner of a 2006 Volkswagen Passat Variant contacted STS (Warsaw) after the car had completely stopped starting. The steering column was locked, the engine would not start, and it was impossible to perform a full computer diagnostic. The car literally had to be carried into the repair bay by hand.
Problem: The owner of a Skoda Octavia A7 2.0 TFSI 16V contacted STS (Warsaw) again with complaints about the incorrect operation of the electric steering rack, which had previously been repaired by our company. After approximately 28,900 km of mileage since the repair, the unit lost its power, extraneous noises appeared, and the steering feel changed. The customer considered the case to be covered by warranty.
Problem: The owner of a Hyundai i30 encountered a knocking noise in the steering caused by wear on the power steering drive pinion inside the steering column.
Problem: A Land Rover was brought to the STS workshop in Warsaw with a request to repair the generator. According to the customer, the car had already been to another service center, where the starter-generator, one of the most expensive components of a mild hybrid, was identified as the cause of the MHEV system malfunction.
Problem: In a diesel-electric Peugeot 508 HYbrid4 Berline 2.0 HDi 163 FAP (DW10CTED4), the owner encountered a complete shutdown of the hybrid system – the engine would not start, and numerous fault warnings appeared on the instrument panel.
Problem: The hybrid Audi Q7 lost almost half of its electric range — instead of 40 kilometres on a single charge, it only managed 18.
Problem: In the case of a critical discharge of a low-voltage battery (12–48 V), the electronics prevent charging because it is dangerous with Li-Ion batteries. The manufacturer recommends discarding fully functional batteries and replacing them with new ones. This is expensive.
Problem: A Maybach 57/62 (2002–2011) experienced a generator malfunction. The charging system was not functioning correctly, which posed a risk to the stable operation of numerous electronic modules. Replacing the unit was not considered the best option due to the extremely high cost of the original generator and its limited availability.
