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Code 10 - Intake Air Temperature (Ta) Sensor

  1. Turn ignition off. Remove "EFI/ECU" fuse in under-hood relay panel for 10 seconds to reset ECU. Start engine and observe "CHECK ENGINE" light. If light is off, problem is intermittent. Test drive vehicle and check again.
  2. If "CHECK ENGINE" light is on, turn ignition off. Measure resistance across TA sensor terminals. If reading is not 1000-4000 ohms, replace TA sensor. If reading is as specified, measure voltage between White/Red (pos.) terminal and ground. If reading is about 5 volts, go to step 3). If not, go to step 4).
  3. Measure voltage between White/Red (pos.) and Green/White (neg.) wire terminals. If voltage is not about 5 volts, repair open in Green/White wire between ECU terminal A4 and sensor. If reading is about 5 volts, substitute a known good ECU. If condition is rectified, replace original ECU.
  4. Turn ignition off. Connect ECU test harness connector "A" between ECU and ECU connectors. See Figure . Turn ignition on. Measure voltage between ECU terminals A4 (pos.) and A16 (neg.). If 5 volts is present, repair open in White/Red wire between ECU terminal A4 and TA sensor. If not, go to step 5).
  5. If reading was not about 5 volts, disconnect ECU test connector "A" from main wire harness side. Measure voltage between terminals A4 (pos.) and A16 (neg.). If voltage reading is about 5 volts, repair short in White/Red wire between ECU terminal A4 and TA sensor.
  6. If voltage is not about 5 volts, substitute a known good ECU. If voltage is now correct, replace original ECU.
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