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 MANUALSACURA19983.5RL SPECIAL EDITIONREPAIR AND DIAGNOSIS (SINGLE PAGE)TRANSMISSIONAUTOMATIC TRANSDIAGNOSIS - M5DACOMPONENT TESTINGENGINE COOLANT TEMPERATURE (ECT) SENSOR
1998 Acura 3.5RL Special Edition
Engine Coolant Temperature (ECT) Sensor
1998 Acura 3.5RL Special EditionSECTION Engine Coolant Temperature (ECT) Sensor
- ECT sensor is located in coolant pipe, near throttle body and contains a Red/White wire and Green/White wire in the harness connector. See Figure .
- Disconnect harness connector from ECT sensor. Using ohmmeter, check sensor resistance in accordance with engine coolant temperature. See ENGINE COOLANT TEMPERATURE (ECT) SENSOR RESISTANCE table. Replace ECT sensor if resistance is not as specified.
ENGINE COOLANT TEMPERATURE (ECT) SENSOR RESISTANCE
| Temperature °F (°C) | Ohms (1) | ||
|---|---|---|---|
| -4 (-20) | 15,000-18,000 | ||
| 68 (20) | 2500-3500 | ||
| 175 (80) | 400-600 | ||
| 212 (100) | 250-350 | ||
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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.