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.

2004 Mazda MPV LXFACTORY OEM SERVICE PROCEDURE

Resistance Inspection

Drain the engine coolant. (See COOLING SYSTEM SERVICE WARNINGS .) (See ENGINE COOLANT REPLACEMENT .)
Remove the ECT sensor.
Place the ECT sensor in water with a thermometer, and heat the water gradually.
Measure the resistance between the ECT sensor terminals using an ohmmeter.

Fig 1: Inspecting Resistance Of Engine Coolant Temperature (ECT) Sensor
Courtesy of MAZDA MOTORS CORP.
- If not as specified, replace the ECT sensor.
- If the ECT sensor is okay, but PID value or PCM terminal 38 voltage are out of specification, perform Circuit Open/Short Inspection .
  Specification
  
  Fig 2: Specification Table
  Courtesy of MAZDA MOTORS CORP.

Factory Service Tools

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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.

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