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Home >> Honda >> 1989 >> Prelude S, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Tests W/Codes - Fuel Injected >> Testing - Trouble Code Tests >> Code 10: Air Temperature (Ta) Sensor

Code 10: Air Temperature (Ta) Sensor

  1. Turn ignition off. Remove clock fuse in the under-hood relay box for 10 seconds to reset ECU. Start engine and observe "CHECK ENGINE" light. If light is off, problem is intermittent. Test drive and check again.
  2. If light is on, turn ignition off. Measure resistance across TA sensor terminals. If resistance reading is not 1000-4000 ohms, replace sensor. If resistance reading is within specification, disconnect ohmmeter and turn ignition on. Measure voltage between ground and White/Red wire terminal. If reading is about 5 volts, go to next step. If reading is not about 5 volts, go to step 4).
  3. Measure voltage between same wires from step 2). If voltage is not about 5 volts, repair open circuit in wire(s) to sensor. If wire(s) is okay, substitute a known good ECU and recheck. If condition is rectified, replace original ECU.
  4. If voltage in step 2) was not about 5 volts, turn ignition off. Connect ECU test harness between ECU and ECU connector. Turn ignition on. Measure voltage between terminals C5 (pos.) and C12 (neg.). If voltage reading is about 5 volts, repair open in White/Red or Red wire between ECU terminal C5 and sensor.
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