Toyota prius 3rd gen Engine Coolant temperature sensor (Combination Meter) Assembly (G2)

Toyota prius 3rd gen Engine Coolant temperature sensor (Combination Meter) Assembly (G2) (89422-33030)

Toyota Prius 3 rd Generation (XW30)

Engine Coolant temperature sensor (Combination Meter) Assembly Wiring Guide: DIY Pinout Diagram



What is: The Engine Coolant Temperature (ECT) Sensor in the Combination Meter Assembly monitors the engine’s coolant temperature and sends this data to the dashboard gauge and the vehicle’s ECU. It helps regulate engine performance, fuel mixture, and cooling fan operation. By displaying real-time temperature readings to the driver, it prevents overheating and supports efficient engine management and overall vehicle safety.


Engine Coolant temperature sensor (Combination Meter) Assembly (89422-33030)
OEM ECT sensor 89422-33030 for Toyota Prius 2009–2015

OEM ECT sensor 89422-33030 for Toyota Prius 2009–2015 .

Toyota Prius 3rd gen Engine Coolant Temperature Sensor (89422-33030) close-up view

Toyota Prius 3rd gen Engine Coolant Temperature Sensor (89422-33030) close-up view.

Toyota Prius Combination Meter coolant temperature sensor with connector port

Toyota Prius Combination Meter coolant temperature sensor with connector port.

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1. Introduction

      The  Toyota Prius 3rd Generation Engine Coolant Temperature (ECT) Sensor for the Combination Meter Assembly (89422-33030) plays a vital role in monitoring and displaying accurate engine temperature information. This sensor measures the engine’s coolant temperature and sends precise signals to both the ECU and the dashboard gauge, ensuring the driver is constantly informed of operating conditions. Its data helps the hybrid system regulate fuel delivery, ignition timing, and cooling fan operation for optimal performance. A properly functioning ECT sensor supports improved fuel efficiency, protects the engine from overheating, and maintains smooth hybrid operation, making it an essential component in the Prius 3rd gen cooling system.



Related parts and Accessories
  • Engine Control Unit (ECU / ECM):- Receives temperature signals for fuel control, ignition timing, and fan operation.
  • Combination Meter Assembly (Dashboard Display Unit) :-Shows the coolant temperature reading to the driver.
  • Radiator Cooling Fan & Fan Control Module:-Activates based on coolant temperature data.
  • :-
  • Thermostat Assembly:- Regulates coolant flow based on temperature.
  • Engine Coolant Temperature Sensor (Main Sensor for ECU) :- Works alongside the combination-meter sensor.
  • Hybrid Control ECU:- Uses temperature data for hybrid system efficiency.
  • Water Pump Assembly (Electric Pump):- Ensures proper coolant circulation.
  • Radiator & Cooling System Components:- Work with the temperature sensor to maintain ideal engine temperature.




2. Engine Coolant temperature sensor (Combination Meter) Assembly Wiring Diagram & Pinout


A. Connector Location

  • Engine Coolant temperature sensor (Combination Meter) Assembly Position: located near the thermostat area, where coolant comes out of the engine.
  • Connector Type:
    • G2 (2 pin) Black housing

B. Wiring Table

Engine Coolant Temperature Sensor (Combination Meter) Assembly (G2)



G2 TERMINALS OF Engine Coolant Temperature Sensor (Combination Meter) Assembly CONECTOR

Terminal No Symbol
(Pin Definition) 		Wiring (Color Code)
& Color 		Electrical Paths
G2-1 E2
(W)
White
➔ GD1 2 ➳ DA1 5 ➳ AL2 9 ➳ L27 9 (E2) [Combination Meter Assembly]
G2-2 TWS3 (B)
Black
➔ GD1 1 ➳ DA1 6 ➳ AL2 8 ➳ L27 16 (TWS3) [Combination Meter Assembly]

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