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)EXTERNAL PAGESDIFFERENT CARSECTION 15 (A/C-HEATER SYSTEM)TROUBLE SHOOTINGENGINE COOLANT TEMPERATURE SENSOR
1998 Acura 3.5RL Special Edition
Engine Coolant Temperature Sensor
1998 Acura 3.5RL Special EditionSECTION Engine Coolant Temperature Sensor
WARNING: This page is about a different car, the 1998 Acura 3.0CL and 1998 Acura 2.3CL. However, it is still accessible from the selected car via links, so may be relevant.
- Check Malfunction Indicator Light (MIL). If light comes on, see TESTS W/CODES article in ENGINE PERFORMANCE. If light does not come on, turn ignition off. Remove stereo unit and disconnect climate control unit 20-pin connector. Disconnect engine coolant temperature sensor 2-pin connector. Measure voltage between ground and Red/White wire terminal of 20-pin connector. See Figure .
- If approximately 5 volts does not exist, repair open Red/White wire between climate control unit 20-pin connector and engine coolant temperature sensor. If approximately 5 volts does exist, check for loose wires or poor connections at climate control unit 20-pin connector and engine coolant temperature sensor.
- If connections are okay, substitute known-good climate control unit and recheck. If symptom does not exist after substituting known-good climate control unit, replace original climate control unit.
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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.