Mitsubishi OEM 3520A071 — AYC/ACD Differential Hydraulic Pump (Hydraulic Unit, Diff Control)

The Mitsubishi 3520A071 is the genuine OEM AYC / ACD differential hydraulic pump (hydraulic unit) used on the Lancer Evolution X (CZ4A, 2008–2015). It is the heart of the vehicle's Active Yaw Control (AYC) and Active Center Differential (ACD) systems, generating the hydraulic pressure that drives the differential clutches for torque vectoring and active torque split.

This is a factory genuine Mitsubishi part, a direct replacement for the original unit — ensuring correct fitment, pressure performance and long-term durability for your Evo X.

Your Benefits at a Glance

• 100 % Genuine OEM — Mitsubishi factory part, correct specifications and fitment
• Direct replacement — replaces OEM part numbers 3520A045 and 3520A066
• Correct vehicle fitment — Lancer Evolution X (CZ4A) 2008–2015, including Evolution GSR / MR / Final Edition (2.0L)
• Keeps AYC/ACD working — restores torque-vectoring rear differential and active center differential function
• Essential for drivability & safety — restores proper traction, cornering stability and launch performance
• Factory quality — built to Mitsubishi's original durability and pressure standards

What Is the AYC/ACD System?

The AYC system actively distributes drive torque between the left and right rear wheels for sharper, more stable cornering, while the ACD electronically varies the front/rear torque split at the center differential. Both systems are hydraulically actuated by the 3520A071 pump — when this unit fails, you may see warning lights (AYC/ACD), lose differential function, or hear abnormal pump noise. Replacing it with a genuine unit restores full system performance.

Fitment

表格

Typical Failure Symptoms of the Original Unit

• AYC/ACD warning light illuminated on the dash
• Differential/torque-vector function degraded or inactive
• Constant running or loud noise from the pump
• Hydraulic pressure leak from the unit

If you are replacing a failed unit, we also recommend checking the AYC/ACD accumulator and pressure sensor for a complete repair.