Parts for your 2018 Toyota Mark x-Power steering pump

2018 Toyota Mark X power-steering-pump — what’s actually fitted

For the 2018 Toyota Mark X (GRX130/GRX133), a traditional hydraulic power-steering-pump isn’t used. Toyota’s own service literature for the GRX130-series steering system identifies Electric Power Steering (EPS) rather than a hydraulic setup with a belt-driven pump and fluid reservoir. The Toyota Electronic Parts Catalogue for late-production Mark X models lists a steering rack with an integrated electric assist motor and control module, and no “pump assy, vane” or hydraulic lines. Workshop manuals for the series likewise describe EPS diagnostics (torque sensor, motor, EPS ECU) instead of hydraulic pump inspection. Put simply, the 2018 Mark X doesn’t have a power-steering-pump because it runs EPS.

Why go electric? Toyota engineered the Mark X with a rack-mounted electric motor that provides steering assist on demand. That means no parasitic drag from a belt-driven pump and no power-steering fluid to leak, oxidise or change. EPS also lets the vehicle fine‑tune steering feel with vehicle speed and drive mode, while trimming fuel use and emissions — all points reflected across Toyota’s late-2010s passenger platforms that adopted EPS.

• Efficiency and performance: No belt load on the V6, and assist only when needed.
• Less servicing: No hydraulic hoses, seals, reservoirs or fluid to maintain.
• Tunable feel: The EPS ECU can vary assist and self‑centre characteristics.

What should owners keep an eye on instead of a pump? With EPS, electrical health and mechanical condition of the rack and linkages matter most. A strong 12‑volt battery and clean charging system help the EPS motor and control unit behave consistently. Steering boots, inner/outer tie‑rod ends and front suspension bushes still wear just like any rack‑and‑pinion setup. After alignment work or collision repairs, a steering angle sensor calibration may be required so the EPS knows where “straight ahead” lives.

• Check battery condition and charging voltage during routine servicing.
• Inspect rack boots and tie‑rod ends for play or splits, fix promptly to protect the EPS rack.
• Perform alignment and EPS/steering angle calibrations after suspension or steering work.
• Scan for EPS fault codes if a steering warning light appears or assist feels inconsistent.

Does the 2018 Toyota Mark X have a power-steering-pump?

No — it uses Electric Power Steering. There’s no belt-driven pump or hydraulic reservoir on the engine. Assist comes from an electric motor on the steering rack managed by the EPS control unit.

Where’s the power-steering fluid reservoir on a 2018 Mark X?

There isn’t one. Because the car runs EPS, there’s no hydraulic fluid to top up or replace. If steering feels heavy or odd, technicians will check battery health, scan the EPS, and inspect the rack and linkages rather than chasing fluid issues.

What maintenance replaces power-steering-pump servicing on an EPS-equipped Mark X?

Focus shifts to electrical and mechanical checks: battery and charging system tests, rack boot and tie‑rod inspections, wheel alignment, and EPS/steering angle calibrations after suspension or steering work. Any warning lights should prompt a scan for EPS fault codes.