Toyota prius 3rd Gen E. F. I. Vacuum Sensor Assembly (D3)

Toyota Prius 3 ^rd Generation (XW30)

Manifold Absolute Pressure Sensor Assembly Wiring Guide: DIY Pinout Diagram

What is: The Vehicle Manifold Absolute Pressure (MAP) Sensor Assembly measures the air pressure inside the engine’s intake manifold. It sends this data to the Engine Control Module (ECM) which uses it to calculate engine load, adjust fuel injection and control ignition timing. Accurate MAP sensor signals help ensure smooth performance, good fuel efficiency and reduced emissions.

Manifold Absolute Pressure Sensor Assembly (89421-47010)

Hybrid engine MAP sensor Toyota Prius 2010–2015 model

OEM Toyota MAP sensor 89421-47010 front and rear view

Toyota Prius 3rd Gen MAP sensor assembly 89421-47010 close-up

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1. Introduction

      The  Toyota Prius 3rd Generation The Manifold Absolute Pressure (MAP) Sensor Assembly (Part No. 89421-47010) used in the Toyota Prius 3rd Generation (XW30) plays a vital role in engine and hybrid system efficiency. Installed on the intake manifold, it accurately measures intake air pressure and sends real-time data to the Engine Control Module (ECM). The ECM uses this information to determine engine load, optimize air-fuel mixture, control ignition timing and support smooth transitions between electric and engine operation. A properly functioning MAP sensor ensures stable idling, responsive acceleration, improved fuel economy, and reduced exhaust emissions, making it essential for reliable Prius performance.

1. Sensors & Input Devices
   • Intake Air Temperature (IAT) Sensor:-works with MAP to calculate air density
   • Throttle Position Sensor (TPS):- helps determine engine load
   • Mass Air Flow (MAF) Sensor:-cross-checks intake air data
   • Engine Coolant Temperature (ECT) Sensor:- affects fuel and ignition corrections
   • Oxygen / A-F Sensors:-verify combustion results
2. Control Units
   • Engine Control Module (ECM):-primary controller using MAP data
   • Hybrid Vehicle Control ECU:-coordinates engine and motor operation
   • Skid Control ECU (indirect):-engine torque coordination during braking
3. Actuators & Systems
   • Fuel Injectors:-fuel quantity adjusted using MAP input
   • Electronic Throttle Body:- airflow control
   • EGR System:-exhaust gas flow calculated with MAP feedback

2. Manifold Absolute Pressure Sensor Assembly Wiring Diagram & Pinout

A. Connector Location

• Manifold Absolute Pressure Sensor Assembly Position: Mounted on the upper intake manifold, just after the throttle body, on top of the engine.


• Connector Type:
  • D3 (4 pin) Black housing

B. Wiring Table

Manifold Absolute Pressure Sensor Assembly (D3)

D3 TERMINALS OF Manifold Absolute Pressure Sensor Assembly CONECTOR

Terminal No	Symbol (Pin Definition)	Wiring (Color Code) & Color	Electrical Paths
D3-1	PIM	(B) Black	➔ D28 69 (PIM) [Engine Control Module]
D3-2	EL	(Y) Yellow	➔ D28 71 (EPIM) [Engine Control Module]
D3-3	VC	(L) Blue	➔ D28 72 (VCPM) [Engine Control Module]
D3-4	_	_	_

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