Standard Ignition AC464 Idle Air Control Valve

Idle Air Control Valve for Toyota and Scion

Standard Ignition AC464 is an idle air control valve for select Toyota and Scion applications. It is built with an oval connector shape, 3 terminals, and 2 hose connectors to match the original-style electrical and vacuum interface on the vehicle.

Fits 2000-2005 Toyota Echo, N/A. Fits 2004-2006 Scion xA, N/A. Fits 2004-2006 Scion xB, N/A. Standard Ignition AC464 is also cross-referenced to Eastern Catalytic 50577 for the same application.

Key Features

• Idle air control valve for fuel injection system service
• Oval connector shape for OE-style fitment
• 3-terminal electrical connection
• 2 hose connectors for intake air control routing
• No gaskets included
• No hardware included

Detailed Description

Standard Ignition AC464 is an idle air control valve used to regulate bypass air at idle on select Toyota Echo and Scion xA and xB models. By controlling airflow around the throttle plate, it helps maintain stable idle speed when the engine is cold, when accessories are engaged, or when the vehicle is under changing load conditions. The AC464 part number is a direct reference for buyers searching for a replacement idle air control valve for Toyota Echo 2000-2005 and Scion xA or xB 2004-2006 applications.

This part number, AC464, is also listed with interchange references including 2-16748, 2227021010, and AC4190. Use the vehicle fitment details to confirm the exact application before ordering.

What It May Help Solve

• Unstable or fluctuating idle speed
• Engine stalling at stops or during warm-up
• Idle speed that is too high or too low
• Rough idle after throttle closure
• Idle control issues related to air bypass regulation

Installation Notes and Tips

Verify connector shape, terminal count, and hose connection layout before installation. Because gaskets and hardware are not included, inspect the mounting surface and related seals during service and replace any worn components as needed. Confirm the vehicle application for Toyota Echo, Scion xA, or Scion xB before replacing the original valve.

Quality Assurance

Standard Ignition supplies replacement ignition and engine management components for service applications. AC464 is built to match the listed fitment and connection details for the specified Toyota and Scion models.