1992 Acura Legend Base, AutomaticFACTORY OEM SERVICE PROCEDURE

Code 10, Air Temperature (Ta) Sensor

  1. Turn ignition off. Remove fuse No. 15 (ACG) from underdash fuse box for 10 seconds to reset ECU. Check ECU for fault codes. See RETRIEVING CODES  . If Code 10 is not present, problem is intermittent. Check for poor and loose connections at air temperature sensor and ECU connector. Test drive vehicle and retest.
  2. If Code 10 is present, turn ignition off. Disconnect 2-wire 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.
  3. If about 5 volts are not present, go to step 4). If about 5 volts are present, measure voltage between Red/Yellow (+) wire terminal and Green/White (-) wire terminal at sensor. If about 5 volts are not present, repair open in Green/White wire between ECU terminal D22 and air temperature sensor. If about 5 volts are present, substitute a known good ECU, and recheck. If symptom/condition goes away, replace original ECU.
  4. Turn ignition off. Connect ECU Test Harness (07LAJ-PT3010A ) between ECU and ECU connector. 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 ECU connector terminal D15 and air temperature sensor. If about 5 volts are present, substitute a known good ECU, and recheck. If symptom/condition goes away, replace original ECU.
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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.