Toyota prius 3rd Gen Purge VSV (D11)

Toyota Prius 3 ^rd Generation (XW30)

Purge VSV Assembly Wiring Guide: DIY Pinout Diagram

What is: A vehicle Purge VSV (Vacuum Switching Valve) Assembly is part of the EVAP system. It controls when fuel vapors stored in the charcoal canister are sent to the engine to be burned. The engine ECU opens the valve under proper conditions, helping reduce emissions, improve fuel efficiency, and prevent fuel vapor from escaping into the air.

Purge VSV Assembly (25860-37040)

OEM Toyota Purge VSV Assembly 25860-37040 front view

Detailed image of Toyota Prius EVAP Purge VSV mounting bracket

Purge VSV Assembly mounted near intake manifold on Prius Gen 3

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1. Introduction

      The  Toyota Prius 3rd Generation Purge VSV Assembly (25860-37040) is a key component of the vehicle’s EVAP (Evaporative Emission Control) system. Its main role is to regulate the flow of fuel vapors from the charcoal canister to the engine intake manifold. Controlled by the engine ECU, the valve opens only under specific driving conditions to ensure efficient combustion of stored vapors. This process helps reduce harmful emissions, improves fuel efficiency, and maintains stable engine operation. A properly functioning Purge VSV also prevents rough idling, hard starting, and EVAP-related warning lights in the Prius.

Related parts and Accessories

• Charcoal Canister :-Stores fuel vapors from the fuel tank.
• Fuel Tank:-Source of fuel vapors captured by the EVAP system.
• Engine Control Module (ECM / ECU):-Controls Purge VSV opening and closing.
• Intake Manifold :-Draws fuel vapors into the engine for combustion.
• EVAP Canister Vent Valve:-Regulates fresh air flow into the canister.
• Vacuum Hoses & EVAP Lines :-Carry vapors and vacuum signals.
• Fuel Tank Pressure Sensor:-Monitors EVAP system pressure.

2. Purge VSV Assembly Wiring Diagram & Pinout

A. Connector Location

• Purge VSV Assembly Position: Located in the engine bay, near the intake manifold, connected to EVAP hoses and an electrical connector.
• Connector Type:
  • D11 (2 pin) Black housing

B. Wiring Table

Purge VSV Assembly (D11)

D11 TERMINALS OF Purge VSV (D11) CONECTOR

Terminal No	Symbol (Pin Definition)	Wiring (Color Code) & Color	Electrical Paths
D11-1	1	(V) Violte	➔ D28 28 (PRG) [Engine Control Module]
D11-2	2	(B) Black	➔ ✠ ➳ DA2 4 ➔ 1 2 ➤ 10A Blade Fuse [EFI NO.2]

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3. Quick Pin Summary – D11 Connector

Connector: D11 (2-pin, Black housing)

• D11-1 PRG (Purge Control Signal):
  ECU control line for the Purge VSV. The Engine Control Module switches this circuit to operate the valve under specific engine and EVAP conditions, allowing fuel vapors to flow from the charcoal canister to the intake manifold. Connected to Engine Control Module (ECM), connector D28, terminal 28 (PRG).
• D11-2 +B (Battery Power Supply) :
  Constant power supply for the Purge VSV. This circuit provides fused battery voltage, enabling the valve to energize when the ECU commands purge operation. Connected to EFI NO.2 circuit, through 10A fuse, via splice point, supplying power to the Purge VSV.

Quick Note: The Purge VSV Assembly is a key EVAP system component that controls when stored fuel vapors are sent from the charcoal canister to the engine for combustion. Powered by a fused battery supply and controlled by the Engine Control Module, the valve operates only under specific driving conditions to reduce emissions and improve fuel efficiency. A fault in the D11 circuit or valve can cause rough idle, hard starting, and EVAP-related warning codes in the Toyota Prius Gen 3.