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Home >> Toyota >> 1996 >> Tercel Base, Standard >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Control System Tests W/Codes >> Circuit Tests >> DTC P0110 - Intake Air Temperature (IAT) Sensor Circuit >> Diagnosis & Repair
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Diagnosis & Repair

  1. Connect scan tester to DLC3 connector. See Figure. Turn ignition on. Turn on scan tester. Monitor IAT sensor temperature. If temperature displayed is same as outside temperature, inspect component and ECM connections. Problem is intermittent.
  2. If temperature displayed is 284°F (140°C) or more, go to step 5). If temperature displayed is -40°F (-40°C), turn ignition off. Disconnect IAT sensor connector. Connect a jumper wire between IAT sensor wiring harness connector terminals. Turn ignition on. Monitor IAT sensor temperature on scan tester.
  3. If temperature displayed is 284°F (140°C) or more, replace IAT sensor and retest. If temperature displayed is less than 284°F (140°C), turn ignition off. Remove jumper wire. Access ECM behind glove box. Connect a jumper wire between terminals No. 15 (Blue/Black wire) and No. 16 (Brown wire) at ECM E7 connector. See Figure.
  4. If temperature displayed on scan tester is 284°F (140°C) or more, check for an open in wiring harness between IAT sensor connector and ECM. See appropriate wiring diagram in WIRING DIAGRAMS article. Repair as necessary. If temperature displayed on scan tester is less than 284°F (140°C), replace ECM and retest.
  5. Turn ignition off. Disconnect IAT sensor connector. Turn ignition on. If temperature displayed on scan tester is -40°F (-40°C), replace IAT sensor and retest. If temperature displayed is not -40°F (-40°C), turn ignition off.
  6. Access ECM behind glove box. Disconnect ECM E7 connector. See Figure. Turn ignition on. If temperature displayed is -40°F (-40°C), inspect and repair wiring harness between IAT sensor and ECM. See appropriate wiring diagram in WIRING DIAGRAMS article. If temperature displayed by scan tester is not -40°F (-40°C), replace ECM and retest.
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