Parts for your 2018 Toyota Mark x-Power steering pump

2018 Toyota Mark X — is a power steering pump used?

For the 2018 Toyota Mark X (GRX130 series), a traditional hydraulic power steering pump isn’t fitted. This model uses an Electric Power Steering (EPS) system, where an electric motor and control unit provide steering assist, so there’s no hydraulic pump, no fluid reservoir, and no power steering hoses.

Technical references that document the use of EPS (and the absence of a hydraulic pump) on the GRX130 Mark X include:

• Toyota Mark X GRX130 Repair Manual: Steering section – Electric Power Steering (EPS) system, describing the EPS ECU, torque sensor and assist motor in place of a hydraulic pump.
• Toyota Electronic Parts Catalogue (EPC) for GRX130 (2018): Steering listings show “Motor Assy, Power Steering” and related EPS components, no “Pump Assy, Power Steering,” no pressure lines, and no fluid reservoir for this model year.
• Toyota New Car Features (NCF) for GRX130: Notes EPS architecture, assist characteristics, and control logic, confirming an all-electric assist rather than hydraulic.

Why Toyota didn’t use a power steering pump on the 2018 Toyota Mark X comes down to efficiency, control, packaging and reliability. EPS cuts parasitic load on the engine, improving fuel economy and emissions—handy for city and long-haul driving around Australia and New Zealand. It also allows smarter tuning: the car can vary assist with speed, support lane-keeping functions, and deliver a more consistent steering feel. Without a pump, belt, fluid, or hoses, there’s less to leak and fewer wear items under the bonnet, which trims servicing costs over the life of the vehicle.

Owners chasing “2018toyotamarkxpowersteeringpump” should know there’s simply no hydraulic pump to replace or top up. Instead, look after what the EPS depends on: keep the 12V battery and charging system healthy (low voltage can trigger EPS warnings or heavy steering), maintain correct tyre pressures and wheel alignment, and replace worn suspension or steering joints promptly. If the steering warning light pops up, a scan with Techstream-capable diagnostics will pull EPS fault codes, common fixes include steering angle sensor calibration after an alignment, or checking connectors at the steering rack motor. During routine servicing, a quick inspection of the rack boots, column joints and subframe fasteners is worthwhile, but no fluid service is required. This all-electric setup makes the 2018 Toyota Mark X easy to live with—less mess, less maintenance, and reliably light steering feel on the daily commute.

• Where is the power steering pump on a 2018 Toyota Mark X?

  There isn’t one. The 2018 Mark X runs EPS, so assist comes from an electric motor on the steering rack (or column, depending on spec) controlled by an EPS ECU. No pump, no fluid lines, and no reservoir are fitted.

  If the steering feels heavy, think battery health, alignment, or an EPS fault code rather than a failed pump.

• What maintenance does the 2018 Toyota Mark X power steering system need?

  No hydraulic fluid changes. Keep the 12V battery in good nick, ensure the alternator is charging properly, set tyre pressures, and get wheel alignments as required. After suspension or steering work, have the steering angle sensor calibrated.

  Ask your technician to scan the EPS if a warning light appears, and to inspect rack boots and column joints during regular servicing.

• Can a steering issue be misdiagnosed as a bad pump on this car?

  Yes—because people go looking for a pump that doesn’t exist. On the 2018 Mark X, heavy steering, intermittent assist, or a steering warning lamp usually points to low system voltage, a calibration issue, or an EPS component fault, not a hydraulic failure.

  Proper diagnosis needs a scan tool to read EPS codes and live data, plus basic checks of battery, grounds and fuses.