LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Acura >> 1988 >> Legend Base, 2D Coupe, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Electronic Control System >> Testing >> Code 10, Air Temperature (Ta) Sensor
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Code 10, Air Temperature (Ta) Sensor

  1. Turn ignition off and disconnect alternator sense fuse in under-hood relay box for 10 seconds to reset ECU. Start engine and observe PGM-FI warning light. If light is off, problem is intermittent. Test drive and check again.
  2. If light is on, turn ignition off. Disconnect sensor connector. Measure resistance across sensor terminals. If reading is not 1000-4000 ohms, replace sensor. If resistance is within specification, turn ignition on. Measure voltage between ground and Red/Black wire terminal. If reading is about 5 volts, go to step 3). If reading is not about 5 volts, go to step 4).
  3. Measure voltage between Red/Black (pos.) wire terminal and Green/White (neg.) wire terminal. If voltage is not about 5 volts, repair open in Green/White wire between ECU terminal C14 and sensor. If reading is about 5 volts, substitute a known good ECU. If condition is rectified, replace original ECU.
  4. If voltage in step 2) was not about 5 volts, turn ignition off. Connect system checker harness between ECU and ECU connector. Turn ignition on. Measure voltage between terminals C5 (pos.) and C14 (neg.). If voltage reading is about 5 volts, repair open in Red/Black wire between ECU and sensor.
  5. If reading was not about 5 volts, disconnect "C" connector from the right side wire harness only, not the ECU. Measure voltage between terminals C5 (pos.) and C14 (neg.). If voltage reading is about 5 volts, repair short in Red/Black wire between ECU and sensor.
  6. If voltage is not about 5 volts, substitute a known good ECU. If voltage is now correct replace original ECU.
scientia non olet · About LEMON Manuals