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Home >> Toyota >> 1995 >> Avalon XLS >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Diagnostic Testing >> Code P0115 - Coolant Temperature Sensor Circuit >> Diagnosis & Repair
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Diagnosis & Repair

  1. Connect scan tester to DLC-3. See Figure. Turn ignition on. Turn on scan tester. Monitor CTS temperature. If temperature displayed is same as actual coolant temperature, inspect component and ECM connections. Problem is intermittent.
  2. If temperature displayed is 284°F (140°C), go to step  5. If temperature displayed is -40°F (-40°C), turn ignition off. Disconnect CTS harness connector. CTS is located in thermostat housing. Using jumper wire, connect CTS harness connector terminals. Turn ignition on. Monitor CTS temperature on scan tester.
  3. If temperature displayed is 284°F (140°C), replace CTS and retest. If temperature displayed is NOT 284°F (140°C), turn ignition off. Remove jumper wire. Access ECM behind glove box. Connect jumper wire between ECM harness connector "E7" terminals No. 22 (E2) and No. 20 (THW). See Figure.
  4. If temperature displayed on scan tester is 284°F (140°C) or more, inspect and repair circuits for open between CTS harness connector and ECM. See wiring diagram in WIRING DIAGRAMS article. If temperature displayed on scan tester is NOT 284°F (140°C) or more, replace ECM and retest.
  5. Turn ignition off. Disconnect CTS harness connector. Turn ignition on. If temperature displayed on scan tester is -40°F (-40°C), replace CTS and retest. If temperature displayed is NOT -40°F (-40°C), turn ignition off.
  6. Access ECM behind glove box. Disconnect ECM harness connector "E7". See Figure. Turn ignition on. If temperature displayed is -40°F (-40°C), inspect and repair circuits between CTS and ECM for short. See wiring diagram in the WIRING DIAGRAMS article. If temperature displayed by scan tester is NOT -40°F (-40°C), replace ECM and retest.
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