Toyota prius 3rd gen Mass Air Flow Meter Assembly (D5)

Toyota Prius 3 ^rd Generation (XW30)

Air Flow Meter Assembly Wiring Guide: DIY Pinout Diagram

What is: A Vehicle Mass Air Flow (MAF) Meter Assembly measures the amount of air entering the engine. It sends this data to the Engine Control Module (ECM), which uses it to calculate the correct fuel injection for efficient combustion. Accurate MAF readings help improve engine performance, fuel economy, and emissions control by maintaining the proper air–fuel mixture.

Air Flow Meter Assembly (22204-21010)

OEM Mass Air Flow Meter Assembly for Toyota Prius 2010–2015

Toyota 22204-21010 MAF sensor front and rear views

Toyota Prius 3rd Gen Mass Air Flow Meter Assembly 22204-21010

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1. Introduction

      The  Toyota Prius 3rd Generation Mass Air Flow Meter Assembly (22204-21010) is a critical sensor used to measure the precise amount of air entering the engine intake system. This information is sent to the Engine Control Module (ECM) to accurately control fuel injection timing and quantity, ensuring optimal air-fuel mixture. In the Prius hybrid system, accurate airflow measurement is essential for smooth engine operation, efficient fuel economy, and reduced exhaust emissions. The MAF sensor also plays an important role in engine load calculation, idle stability, and throttle response. A properly functioning MAF meter supports reliable hybrid performance and overall drivability.

Related parts and Accessories

• Engine Control Module (ECM) :-Processes MAF data to control fuel injection, ignition timing, and engine operation.
• Throttle Body Assembly :-Regulates the amount of air entering the engine based on driver demand and ECM control.
• Air Cleaner (Air Filter) Housing:-Filters dust and debris from intake air before it reaches the MAF sensor and engine.
• Fuel Injectors :-Spray precisely metered fuel into the engine cylinders for combustion.
• Oxygen (A/F) Sensors:-Monitor exhaust oxygen levels to fine-tune the air-fuel ratio.
• Manifold Absolute Pressure (MAP) Sensor :-Detects intake manifold pressure to assist in engine load calculation.
• Electronic Throttle Control System:-Electronically manages throttle opening for smooth and efficient engine response.

2. Air Flow Meter Assembly Wiring Diagram & Pinout

A. Connector Location

• Air Flow Meter Assembly Position: Located in the intake air duct between the air cleaner housing and throttle body.
• Connector Type:
  • D5 (5 pin) Black housing

B. Wiring Table

Mass Air Flow Meter Assembly (D5)

D5 TERMINALS OF Mass Air Flow Meter Assembly CONECTOR

Terminal No	Symbol (Pin Definition)	Wiring (Color Code) & Color	Electrical Paths
D5-1	THA	(P) Pink	➔ D28 116 (THA) [Engine Control Module]
D5-2	E2	(BR) Brown	➔ D28 93 (ETHA) [Engine Control Module]
D5-3	+B	(B) Black	➔ ✠ ➔ DA2 4 ➳ 1 2 ➤ 10A Blade Fuse [EFI NO.2]
D5-4	E2G	(W) White	➔ D28 117 (E2G) [Engine Control Module]
D5-5	VG	(B) Black	➔ D28 94 (VG) [Engine Control Module]

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