Toyota prius 3rd gen E.F.I Engine coolant Temperature Sensor Assembly (D6)

Toyota Prius 3 ^rd Generation (XW30)

Engine coolant Temperature Sensor Assembly Wiring Guide: DIY Pinout Diagram

What is: The Engine Coolant Temperature (ECT) Sensor Assembly measures the temperature of the engine coolant and sends this data to the Engine Control Module (ECM). The ECM uses this information to adjust fuel injection, ignition timing, cooling fan operation, and emission control systems. Accurate coolant temperature sensing ensures smooth engine performance, improved fuel efficiency, and protection against engine overheating.

Engine coolant Temperature Sensor Assembly (89422-33030)

Detailed view of 89422-33030 sensor showing connector pins and coolant contact tip

Hybrid vehicle engine sensor for coolant temperature measurement on Toyota Prius

Hybrid vehicle coolant sensor mounted on engine, showing wiring connector and sensor tip

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1. Introduction

      The  Engine Coolant Temperature Sensor Assembly (89422-33030) in the Toyota Prius 3rd Generation (ZVW30) is a critical engine management component that monitors the temperature of the engine coolant in real time. This sensor provides precise temperature data to the Engine Control Module (ECM), enabling accurate control of fuel injection, ignition timing, engine warm-up strategy, and cooling fan operation. Proper ECT sensor feedback is especially important in hybrid systems, as it helps optimize engine start-stop operation, fuel efficiency, and emissions performance. A faulty sensor can lead to poor drivability, increased fuel consumption, or overheating warnings.

Related parts and Accessories

• Engine Control Module (ECM):-Receives coolant temperature data and manages engine operation
• Hybrid Vehicle Control ECU:-Coordinates engine operation within the hybrid system
• Fuel Injection System:-Adjusts fuel delivery based on engine temperature
• Ignition System:- Modifies ignition timing during cold start and warm operation
• Cooling Fan Control System:- Activates radiator fans when required
• Radiator & Thermostat :- Regulate coolant flow and engine temperature

2. Engine coolant Temperature Sensor Assembly Wiring Diagram & Pinout

A. Connector Location

• Engine coolant Temperature Sensor Assembly Position: Located on the engine coolant outlet housing near the cylinder head for direct coolant measurement.


• Connector Type:
  • D6 (2 pin) Black housing

B. Wiring Table

E.F.I Engine Coolant Temperature Sensor Assembly (D6)

D6 TERMINALS OF E.F.I Engine coolant Temperature Sensor Assembly CONECTOR

Terminal No	Symbol (Pin Definition)	Wiring (Color Code) & Color	Electrical Paths
D6-1	E2	(BR) Brown	➔ D28 65 (ETHW) [Engine Control Module]
D6-2	THW	(P) Pink	➔ D28 64 (THW) [Engine Control Module]

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