Toyota prius 3rd gen Acclerator Pedal Sensor Assembly (A29)

Toyota Prius 3 ^rd Generation (XW30)

Acclerator Pedal Sensor Assembly Wiring Guide: DIY Pinout Diagram

What is: The Vehicle Accelerator Pedal Sensor Assembly is an electronic unit attached to the accelerator pedal that measures how far the driver presses the pedal. It converts pedal movement into voltage signals and sends them to the engine or hybrid control module. These signals determine engine power, throttle opening, and acceleration response, ensuring precise, smooth, and efficient drive-by-wire control.

Acclerator Pedal Sensor Assembly (78110-12060)

Detailed view of pedal angle sensor mechanism – Toyota Prius 2010–2015

Toyota Prius Gen 3 accelerator pedal position sensor connector and wiring

Toyota Prius Gen 3 accelerator pedal assembly with dual-channel position sensors

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1. Introduction

      The  Toyota Prius 3rd Generation Accelerator Pedal Sensor Assembly (78110-12060) is a key drive-by-wire component that converts pedal movement into precise electrical signals for the Hybrid Control and Engine Control Modules. Instead of using a mechanical throttle cable, it relies on dual-channel position sensors to ensure accurate pedal angle detection and fail-safe operation. This assembly directly influences throttle opening, power delivery, fuel efficiency, and smooth acceleration. Its lightweight, compact design enhances system reliability while supporting advanced hybrid functions such as regenerative braking coordination and eco-mode response. Proper operation of this sensor is essential for consistent performance and safe vehicle control.

Related parts and Accessories

• Engine Control Module (ECM):-Receives pedal signal voltage and controls engine throttle response.
• Hybrid Vehicle Control ECU (HV ECU):-Interprets pedal demand to manage electric motor torque and hybrid power flow.
• Throttle Body with Electronic Throttle Control (ETCS-i):-Adjusts throttle plate opening based on pedal sensor inputs.
• Brake/Regenerative Braking System:-Coordinates torque reduction during braking and deceleration.
• Inverter & Motor Generator Control:-Uses pedal input to regulate motor assistance or regenerative force.
• CAN Communication Network:- Transfers accelerator position data across ECUs.
• Power Management Control ECU:- Optimizes power distribution and driving modes (Eco, Normal, Power).

2. Acclerator Pedal Sensor Assembly Wiring Diagram & Pinout

A. Connector Location

• Acclerator Pedal Sensor Assembly Position: The driver’s footwell, mounted directly to the accelerator pedal bracket on the floorboard.


• Connector Type:
  • A29 (6 pin) Black housing

B. Wiring Table

Acclerator Pedal Sensor Assembly (A29)

A29 TERMINALS OF Acclerator Pedal Sensor Assembly CONECTOR

Terminal No	Symbol (Pin Definition)	Wiring (Color Code) & Color	Electrical Paths
A29-1	VCP2	(G) Green	➔ A22 19 (VCP2) [Power Management Control ECU]
A29-2	EP2	(R) Red	➔ A22 35(EP2) [Power Management Control ECU]
A29-3	VPA2	(W) White	➔ A22 27(VPA2) [Power Management Control ECU]
A29-4	VCP1	(Y) Yellow	➔ A22 18(VCP1) [Power Management Control ECU]
A29-5	EP1	(B) Black	➔ A22 34(EP1) [Power Management Control ECU]
A29-6	VPA1	(L) Blue	➔ A22 26(VPA1) [Power Management Control ECU]

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