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Diagnosis & Repair

  1. Connect Toyota hand-held tester or scan tool to Data Link Connector (DLC) No. 3. See Figure. Turn ignition on. Using hand-held tester or scan tool, monitor IAT sensor temperature. If temperature displayed is same as intake air temperature, problem is intermittent. Check component and ECM connections. If temperature displayed is -40°F (-40°C), go to next step. If temperature displayed is 284°F (140°C) or more, go to step  4.
  2. Turn ignition off. Disconnect MAF meter harness connector. Connect a jumper wire between terminals No. 4 (Yellow/Black wire) and No. 5 (Brown wire) at MAF meter harness connector. See Figure. Turn ignition on. Using hand-held tester or scan tool, monitor IAT sensor temperature. If temperature displayed on scan tool is less than 284°F (140°C), go to next step. If temperature displayed on scan tool is 284°F (140°C) or more, replace MAF meter.
  3. Turn ignition off. Remove jumper wire. Access ECM on driver's side of firewall behind driver's seat, luggage compartment lids and partition board. See Figure. Connect a jumper wire by backprobing between terminals No. 22 (Yellow/Black wire) and No. 18 (Brown wire) at ECM harness connector E4. See Figure. Temperature displayed on hand-held tester or scan tool should be 284°F (140°C) or more. If temperature displayed is as specified, repair open in wiring between MAF meter and ECM. See WIRING DIAGRAMS article. If temperature displayed is not as specified, replace ECM.
  4. Turn ignition off. Disconnect MAF meter harness connector. Turn ignition on. If temperature displayed on hand-held tester or scan tool is not -40°F (-40°C), go to next step. If temperature displayed on hand-held tester or scan tool is -40°F (-40°C), replace MAF meter.
  5. Turn ignition off. Access ECM on driver's side of firewall behind driver's seat, luggage compartment lids and partition board. See Figure. Disconnect ECM harness connector E4. See Figure. Turn ignition on. If temperature displayed on hand-held tester or scan tool is -40°F (-40°C), repair short in wiring between MAF meter and ECM. See WIRING DIAGRAMS article. If temperature displayed on hand-held tester or scan tool is not -40°F (-40°C), replace ECM.
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