Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 313 (ELECTRIC COOLING SYSTEM FANS)COMPONENT TESTSENGINE COOLANT TEMPERATURE (ECT) SENSOR
2004 Toyota Matrix XR, FWD, Standard
Engine Coolant Temperature (ECT) Sensor
2004 Toyota Matrix XR, FWD, StandardSECTION Engine Coolant Temperature (ECT) Sensor
WARNING: This page is about a different car, the 2003 Toyota Prius and 2002 Toyota Prius. However, it is still accessible from the selected car via links, so may be relevant.
WARNING:
ECT sensor is located on flywheel end of cylinder head. Manufacturer states that converter and inverter assembly must be removed for access to ECT sensor. The converter and inverter assembly are involved with the high-voltage system used on this vehicle and service procedure should only be performed by authorized dealer.
- Drain engine coolant. Remove converter and inverter assembly. Remove ECT sensor. See ECT SENSOR LOCATIONS . Place ECT sensor and thermometer into a water bath.ECT SENSOR LOCATIONS
Application Sensor Location Prius (1) Rear Of Engine/Cylinder Head (1) See SERVICE PRECAUTIONS . - Measure resistance between terminal Nos. 1 and 2. See Fig 1. If resistance is not as specified, replace ECT sensor.
- Install NEW gasket on sensor, and install ECT sensor. Install converter and inverter assembly. Fill with engine coolant.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.