Toyota prius 3rd gen Trottel Body Assembly (D4)

Toyota Prius 3 ^rd Generation (XW30)

Throttle Body Assembly Wiring Guide: DIY Pinout Diagram

What is: A Vehicle Throttle Body Assembly is a key component of the air-intake system that controls how much air enters the engine. It uses a butterfly valve that opens and closes based on accelerator pedal input, allowing the engine control unit (ECU) to regulate airflow, fuel mixture, and idle speed. Modern electronic throttle bodies use sensors and an actuator motor for precise, smooth, and efficient engine performance.

Throttle Body Assembly (22030-37060)

OEM Toyota 22030-37060 throttle body unit

22030-37060 Throttle body mounted on intake manifold

Electronic Throttle body actuator motor and sensor housing

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1. Introduction

      The Toyota Prius 3rd Generation Throttle Body Assembly (22030-37060) is a crucial component of the hybrid engine’s air-intake system, controlling airflow to ensure smooth and efficient combustion. It features a motor-driven butterfly valve and integrated position sensors that precisely regulate the amount of air entering the engine based on commands from the ECU. This precise control supports stable idle, smooth acceleration, improved fuel economy, and lower emissions.
     Built for durability and reliability, the throttle body prevents rough idling, hesitation during acceleration, and engine stalling under various driving conditions. It works closely with the hybrid control system to maintain optimal engine performance, ensuring the Prius delivers its signature smooth and efficient driving experience.

1. Directly Related Components
   • Mass Air Flow (MAF) Sensor :- Measures incoming air volume and temperature.
   • Engine Control Unit (ECU) :- Controls throttle motor position and fuel delivery.
   • Accelerator Pedal Position Sensor (APPS) :- Sends driver input to ECU for throttle commands.
   • Throttle Position Sensor (TPS):- Built into throttle body to report valve angle.
   • Idle Air Control Logic (within ECU):-Manages idle speed electronically.
2. Hybrid System-Related Units
   • Hybrid Control ECU:-Coordinates engine and electric motor load.
   • Inverter & MG1/MG2 Motor-Generators:-Influence throttle demand during hybrid transitions.
3. Emissions-Related Components
   • EGR Valve & Cooler:-Reduce NOx and affect airflow patterns.
   • EVAP System (Purge Valve) :- Controls fuel vapor flow into the intake stream.

2. Video Explanation (Quick Overview)

The Toyota Prius 3rd Gen throttle body ensures precise airflow control, supporting smooth hybrid performance, improved fuel efficiency, stable idling, and reduced emissions under varying driving conditions.

3. Throttle Body Assembly Wiring Diagram & Pinout

A. Connector Location

• Throttle Body Assembly Position: Mounted on the intake manifold, between air duct and engine.


• Connector Type:
  • D4 (6 pin) Black housing

B. Wiring Table

Throttle Body Assembly (D4)

D4 TERMINALS OF Throttle Body Assembly CONECTOR

Terminal No	Symbol (Pin Definition)	Wiring (Color Code) & Color	Electrical Paths
D4-1	M-	(P) Pink	➔ D2820(M-) [Engine Control Module]
D4-2	M+	(L) Blue	➔ D2821(M+) [Engine Control Module]
D4-3	E2	(G) Green	➔ D28111(ETA) [Engine Control Module]
D4-4	VTA2	(B) Black	➔ D2889(VTA2) [Engine Control Module]
D4-5	VC	(R) Red	➔ D2888(VCTA) [Engine Control Module]
D4-6	VTA	(Y) Yellow	➔ D2890(VTA1) [Engine Control Module]

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4. Quick Pin Summary – D4 Connector

6-Pin Black Connector

• D4-1 M- (Motor −) :
  Throttle actuator motor negative control circuit. The ECM drives the throttle motor by controlling this circuit. Connected to ECM connector D28 , terminal 20 .
• D4-2 M+ (Motor +) :
  Throttle actuator motor positive control circuit. The ECM supplies motor drive voltage through this circuit. Connected to ECM connector D28 , terminal 21 .
• D4-3 E2 (Sensor Ground) :
  Throttle position sensor ground reference. Provides a stable sensor ground for throttle position feedback. Connected to ECM connector D28 , terminal 111 .
• D4-4 VTA2 (Throttle Position Signal 2) :
  Throttle position sensor signal (No. 2). Sends secondary throttle valve position feedback to the ECM. Connected to ECM connector D28 , terminal 89 .
• D4-5 VC (5V Reference Voltage) :
  Sensor reference voltage supply circuit. The ECM supplies approximately 5 V to the throttle position sensors. Connected to ECM connector D28 , terminal 88 .
• D4-6 VTA (Throttle Position Signal 1) :
  Throttle position sensor signal (No. 1). Sends primary throttle valve position feedback to the ECM. Connected to ECM connector D28, terminal 90 .

Quick Note: This is a 6-pin D4 black connector for the electronic throttle body assembly mounted on the intake manifold, where D4-1 and D4-2 drive the throttle actuator motor, and D4-3 through D4-6 provide sensor ground, 5 V reference, and dual throttle position feedback signals to the ECM.