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Home >> Toyota >> 2000 >> RAV4 Base, AWD, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 21 (Engine Control System Self-Diagnostics) >> Diagnostic Tests >> DTC P0110: Intake Air Temperature (IAT) Sensor Circuit >> Diagnosis & Repair
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Diagnosis & Repair

WARNING: This page is about a different car, the 2000 Toyota Celica. However, it is still accessible from the selected car via links, so may be relevant.
  1. Connect scan tool to Data Link Connector (DLC) No. 3. See Figure. Turn ignition on. Using scan tool, monitor IAT sensor temperature. If temperature displayed on scan tool is same as outside temperature, problem is intermittent. Check component and ECM connections. If temperature displayed on scan tool is 284°F (140°C) or more, go to step  4. If temperature displayed on scan tool is -40°F (-40°C), go to next step.
  2. Turn ignition off. Disconnect MAF meter harness connector. Connect a jumper wire between terminals No. 4 (Blue/Red wire) and No. 5 (Brown wire) at MAF meter harness connector. See Figure. Turn ignition on. Using scan tool, monitor IAT sensor temperature. If temperature displayed on scan tool is 284°F (140°C) or more, replace MAF meter. If temperature displayed on scan tool is less than 284°F (140°C), go to next step.
  3. Turn ignition off. Remove jumper wire. Access ECM in driver's side of engine compartment, next to battery. Connect a jumper wire by backprobing between terminals No. 22 (Blue/Red wire) and No. 18 (Brown wire) at ECM harness connector E4. See Figure. Temperature displayed on scan tool should be 284°F (140°C) or more. If temperature displayed on scan tool is as specified, repair open in wiring between MAF meter and ECM. See WIRING DIAGRAMS article. If temperature displayed on scan tool is not as specified, replace ECM.
  4. Turn ignition off. Disconnect MAF meter harness connector. Turn ignition on. If temperature displayed on scan tool is -40°F (-40°C), replace MAF meter. If temperature displayed on scan tool is not -40°F (-40°C), go to next step.
  5. Turn ignition off. Access ECM in driver's side of engine compartment, next to battery. Disconnect ECM harness connector E4. See Figure. Turn ignition on. If temperature displayed on scan tool is -40°F (-40°C), repair short in wiring between MAF meter and ECM. See WIRING DIAGRAMS article. If temperature displayed on scan tool is not -40°F (-40°C), replace ECM.
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