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.
Code D: Evaporator Temperature Sensor
2004 Acura 3.5RLSECTION Code D: Evaporator Temperature Sensor
CAUTION:
To avoid damage to sensor, use an ohmmeter with a measuring current of one milliamp or less.
- Disconnect evaporator temperature sensor harness connector. Measure sensor resistance at specified temperatures. See EVAPORATOR TEMPERATURE SENSOR RESISTANCE table under COMPONENT TESTS. If resistance is not as specified, replace sensor. If resistance is within specifications, go to next step.
- Remove climate control unit and disconnect 8-pin and 20-pin harness connectors. See CLIMATE CONTROL UNIT under REMOVAL & INSTALLATION. Check for continuity between ground and terminal No. 4 (Brown wire) of climate control unit 20-pin harness connector. If continuity does not exist, go to next step. If continuity exists, repair short in Brown wire between climate control unit and evaporator temperature sensor.
- Check for continuity between terminal No. 4 (Brown wire) of climate control unit 20-pin harness connector and terminal No. 2 of evaporator temperature sensor harness connector. If continuity exists, go to next step. If continuity does not exist, repair open in Brown wire.
- Check for continuity in Pink/Blue wire between terminal No. 2 of climate control unit harness connector and terminal No. 1 of evaporator temperature sensor harness connector. If continuity exists, go to next step. If continuity does not exist, repair open in Pink/Blue wire.
- Check for loose wires or poor connections at climate control unit 8-pin and 20-pin harness connectors and evaporator temperature sensor harness connector. 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. See CLIMATE CONTROL UNIT under REMOVAL & INSTALLATION.
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.