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.
1993 Acura Legend Base, AutomaticFACTORY OEM SERVICE PROCEDURE
Code 10, Air Temperature (Ta) Sensor
- Turn ignition off. Remove ACG fuse (No. 15, 7.5-amp) from underdash fuse box for 10 seconds to reset ECM. Check ECM for fault codes. If Code 10 is not present, problem is intermittent. Check for poor and loose connections at air temperature sensor, wiring harness and ECM connectors. Test drive vehicle and retest.
- If Code 10 is present, turn ignition off. Disconnect 2-pin connector from sensor connector. Using an ohmmeter, measure resistance at sensor terminals. If resistance is not 400-4000 ohms, replace air temperature sensor. If resistance is 400-4000 ohms, turn ignition on. Measure voltage between Red/Yellow wire terminal and body ground.
- If voltage is not about 5 volts, go to step 4. If about 5 volts are present, measure voltage between Red/Yellow (+) and Green/White (-) wire terminals at sensor. If voltage is not about 5 volts, repair open in Green/White wire between ECM terminal D22 and air temperature sensor. If about 5 volts are present, replace ECM and retest.
- Turn ignition off. Connect ECM Test Harness (07LAJ-PT3010A ) connector "D" to ECM, leaving wiring harness disconnected. See Figure . Turn ignition on. Measure voltage between test terminals D15 (+) and D22 (-). If about 5 volts are present, repair open or short in Red/Yellow wire between ECM connector terminal D15 and air temperature sensor. If voltage is not about 5 volts, replace ECM and retest.
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.