Toyota prius 3rd Gen Fuel Injector Assembly (14)(15)(16)(17)

Toyota Prius 3 ^rd Generation (XW30)

Fuel Injector Assembly Wiring Guide: DIY Pinout Diagram

What is: A vehicle Fuel Injector Assembly is a precision component that delivers the correct amount of fuel into the engine’s combustion chamber in a fine, high-pressure spray. It ensures efficient fuel atomization, optimal air–fuel mixture, better combustion and reduced emissions. Controlled by the engine’s ECU, the assembly helps maintain smooth performance, fuel economy and reliable engine power under different driving conditions.

Fuel Injector Assembly (23250-37010)

Toyota Prius 3rd gen fuel injector assembly front view, part number 23250-37010

Side view of Toyota Prius 23250-37010 fuel injector assembly

Complete fuel injector assembly for Toyota Prius hybrid engine

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1. Introduction

      The  Toyota Prius 3rd Generation (23250-37010) is a precisely engineered component designed to deliver the exact amount of fuel into the engine for clean and efficient combustion. It plays a vital role in the Prius hybrid system by ensuring optimal fuel atomization, stable engine idling, and improved fuel economy. Controlled by the Engine Control Unit (ECU), this injector adjusts fuel delivery based on driving conditions, temperature, and load. Its durable construction helps maintain low emissions and consistent engine performance. Proper functioning of the injector assembly is essential for smooth acceleration, reduced fuel consumption, and maintaining the Prius' renowned eco-friendly driving experience.

Related parts and Accessories

• Engine Control Unit (ECU/ECM) :-Controls the injector timing and pulse width for accurate fuel delivery.
• Fuel Rail :- Distributes fuel evenly to all injectors under high pressure.
• Fuel Pump & Fuel Filter :- Supplies clean, pressurized fuel to the injector assembly.
• Air Intake System (Throttle Body, MAF Sensor) :- Works with fuel injection to maintain the correct air-fuel ratio.
• Oxygen (O₂) Sensors :- Monitor exhaust gases to help ECU adjust fuel injection.
• Engine Coolant Temperature Sensor :- Influences fuel delivery based on engine temperature.
• Intake Manifold & Combustion Chamber:- Where the fuel is injected and mixed with air for combustion.

2. Fuel Injector Assembly Wiring Diagram & Pinout

A. Connector Location

• Fuel Injector Assembly Position: located on the engine’s intake manifold, directly above the cylinders.
• Connector Type:
  • D14 (2 pin) Black housing
  • D15 (2 pin) Gray housing
  • D16 (2 pin) Black housing
  • D17 (2 pin) Gray housing

B. Wiring Table

Fuel Injector Assembly (D14) (D15) (D16) (D17)

D14 TERMINALS OF Fuel Injector Assembly No.1 CONECTOR

Terminal No	Symbol (Pin Definition)	Wiring (Color Code) & Color	Electrical Paths
D14-1	1	(B) Black	➔ ✠ ➔ DA2 6 ➳ ✠ ➔ 1A 4 ➤ [IG2 Relay]
D14-2	2	(Y) Yellow	➔ D28 85 (#10) [Engine Control Module]

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D15 TERMINALS OF Fuel Injector Assembly No.2 CONECTOR

Terminal No	Symbol (Pin Definition)	Wiring (Color Code) & Color	Electrical Paths
D15-1	1	(B) Black	➔ ✠ ➔ DA2 6 ➳ ✠ ➔ 1A 4 ➤ [IG2 Relay]
D15-2	2	(B) Black	➔ D28 84 (#20) [Engine Control Module]

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D16 TERMINALS OF Fuel Injector Assembly No.3 CONECTOR

Terminal No	Symbol (Pin Definition)	Wiring (Color Code) & Color	Electrical Paths
D16-1	1	(B) Black	➔ ✠ ➔ DA2 6 ➳ ✠ ➔ 1A 4 ➤ [IG2 Relay]
D16-2	2	(L) Blue	➔ D28 83 (#30) [Engine Control Module]

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D17 TERMINALS OF Fuel Injector Assembly No.4 CONECTOR

Terminal No	Symbol (Pin Definition)	Wiring (Color Code) & Color	Electrical Paths
D17-1	1	(B) Black	➔ ✠ ➔ DA2 6 ➳ ✠ ➔ 1A 4 ➤ [IG2 Relay]
D17-2	2	(R) Red	➔ D28 82 (#40) [Engine Control Module]

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