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Home >> Toyota >> 2001 >> ECHO 2D Sedan, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Self-Diagnostics >> Diagnostic Tests >> DTC P0115: Engine Coolant Temperature Sensor Circuit >> Diagnosis & Repair

Diagnosis & Repair

  1. Connect Toyota hand-held tester or scan tool to Data Link Connector (DLC) No. 3. See Figure. Turn ignition on and then turn hand-held tester or scan tool on. Using hand-held tester or scan tool, monitor ECT sensor temperature. If displayed temperature is -40°F (-40°C), go to next step. If displayed temperature is 284°F (140°C) or more, go to step  4. If displayed temperature is same as actual coolant temperature, problem is intermittent. Check component and ECM connections.
  2. Turn ignition off. Disconnect ECT sensor harness connector. Connect a jumper wire between ECT sensor harness connector terminals. Turn ignition on. Using hand-held tester or scan tool, monitor ECT sensor temperature. If displayed temperature is less than 284°F (140°C), go to next step. If displayed temperature is 284°F (140°C) or more, replace ECT sensor.
  3. Turn ignition off. Remove jumper wire. Access ECM behind glove box. See Figure. Connect a jumper wire by backprobing between terminals No. 4 (Red/Blue wire) and No. 9 (Brown wire) at ECM harness connector E6. See Figure. Using hand-held tester or scan tool, monitor ECT sensor temperature. Displayed temperature should be 284°F (140°C) or more. If displayed temperature is as specified, repair open in wiring between ECT sensor and ECM. See WIRING DIAGRAMS article. If displayed temperature is not as specified, replace ECM.
  4. Turn ignition off. Disconnect ECT sensor harness connector. Turn ignition on. Using hand-held tester or scan tool, monitor ECT sensor temperature. If displayed temperature is not -40°F (-40°C), go to next step. If displayed temperature is -40°F (-40°C), replace ECT sensor.
  5. Turn ignition off. Access ECM behind glove box. See Figure. Disconnect ECM harness connector E6. See Figure. Turn ignition on. Using hand-held tester or scan tool, monitor ECT sensor temperature. If displayed temperature is -40°F (-40°C), repair short in wiring between ECT sensor and ECM. See WIRING DIAGRAMS article. If displayed temperature is not -40°F (-40°C), replace ECM.
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