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Diagnosis & Repair

WARNING: This page is about a different car, the 2003 Lexus LX 470. However, it is still accessible from the selected car via links, so may be relevant.
  1. If DTC P0118 is set, go to next step. If DTC P0117 is set, go to step  4. If DTC P0115 is set, connect scan tool to Data Link Connector (DLC) No. 3. See Figure. Turn ignition on. Using scan tool, monitor ECT sensor temperature. If temperature displayed on scan tool is same as actual coolant temperature, problem is intermittent. Check component and ECM connections. If temperature displayed on scan tool is -40°F (-40°C), go to next step. If temperature displayed on scan tool is 284°F (140°C) or more, go to step  4.
  2. Turn ignition off. Disconnect ECT sensor harness connector. Using a jumper wire, connect ECT sensor harness connector terminals. Turn ignition on. Using scan tool, monitor ECT sensor temperature. See Fig 1. 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 ECT sensor.
    Fig 1: Checking For Open Circuit In ECT Sensor Circuit
    G00232377Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. Turn ignition off. Remove jumper wire. Access ECM behind glove box. Using a jumper wire, backprobe between terminals THW and E2 at ECM harness connector. See Figure and Fig 2 . If temperature displayed on scan tool is 284°F (140°C) or more, repair open circuit in wires between ECT sensor and ECM. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. If temperature displayed on scan tool is less than 284°F (140°C), replace ECM.
    Fig 2: Backprobing ECM Connector Terminals THW & E2
    G00239848Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. Turn ignition off. Disconnect ECT sensor harness connector. Turn ignition on. If temperature displayed on scan tool is -40°F (-40°C), replace ECT sensor. See Fig 3. If temperature displayed on scan tool is not -40°F (-40°C), go to next step.
    Fig 3: Checking For Short Circuit In Coolant Temperature Sensor Wiring Harness
    G00239849Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. Turn ignition off. Access ECM behind glove box. Disconnect ECM harness connector E8. See Figure and Fig 4 . Turn ignition on. If temperature displayed on scan tool is -40°F (-40°C), repair short in wires between ECT sensor and ECM. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. If temperature displayed on scan tool is not -40°F (-40°C), replace ECM.
    Fig 4: Identifying ECM Connector E8
    G00239850Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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