LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Toyota >> 1996 >> 4Runner Base, 4WD, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Tests W/Codes - 2.7L >> Circuit Tests >> DTC P0110 - Intake Air Temperature (IAT) Sensor Circuit >> Diagnosis & Repair
April 5, 2026: LEMON Manuals is launched! Read the announcement.

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 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. On A/T models, connect a jumper wire between terminals No. 9 (Brown/Black wire) and No. 12 (Yellow/Green wire) at ECM E7 connector. See Figure. On M/T models, connect a jumper wire between terminals No. 9 (Brown/Black wire) and No. 7 (Yellow/Green wire) at ECM E7 connector.
  4. On all models, if temperature displayed on scan tester is 284°F (140°C) or more, inspect and repair circuits between IAT wiring harness connector and ECM. See appropriate wiring diagram in WIRING DIAGRAMS article. If temperature displayed on scan tester is less than 284°F (140°C) or more, 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 circuits between IAT sensor and ECM for short. See appropriate wiring diagram in WIRING DIAGRAMS article. If temperature displayed by scan tester is not -40°F (-40°C), replace ECM and retest.
scientia non olet · About LEMON Manuals