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Diagnosis & Repair

WARNING: This page is about a different car, the 2003 Lexus SC 430. 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. Turn scan tool on. Using scan tool, monitor ECT sensor temperature. If temperature displayed is same as actual coolant temperature, problem is intermittent. If temperature displayed is -40°F (-40°C), go to next step. If temperature displayed is 284°F (140°C), go to step  4.
  2. Turn ignition off. Disconnect ECT sensor 2-pin connector. See Fig 1. Turn the ignition switch ON. Connect terminals No. 1 and No. 2 of ECT sensor wire harness side connector. Read the engine coolant temperature value on the OBD-II scan tool or the hand-held tester. If temperature displayed is 284°F (140°C) or more, replace engine coolant temperature sensor. If not, go to next step.
    Fig 1: Identifying ECT Sensor 2-Pin Connector
    G00239941Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. Turn ignition off. Disconnect ECT sensor connector. Turn ignition switch ON. Connect jumper wire between terminals THW and ETHW of the E4 ECM connector. See Fig 2. Read the engine coolant temperature value on the OBD-II scan tool or the hand-held tester. If temperature displayed on scan tool is 284°F (140°C) or more, check for an open in wire between ECT sensor harness connector and ECM E4 connector. If temperature displayed on scan tool is not 284°F (140°C) or more, replace ECM and retest.
    Fig 2: Identifying ECM Connector E4 Terminals ETHW & THW
    G00239942Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. Turn ignition off. Disconnect ECT sensor connector. See Fig 1. Turn ignition on. If temperature displayed on scan tool is -40°F (-40°C), replace ECT sensor and retest. If temperature displayed is not -40°F (-40°C), turn ignition off and go to next step.
  5. Disconnect E4 connector from ECM. See Fig 2. Turn ignition on. If temperature displayed is -40°F (-40°C), check for short in wire between ECT sensor and ECM E4 connector. If temperature displayed by scan tool is not -40°F (-40°C), replace ECM and retest.
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