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Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> External Pages >> Different car >> Section 125 (Engine Control System Self Diagnostics (2UZ-FE)) >> Diagnostic Tests >> DTC P0115, DTC P0117 &/Or DTC P0118 >> Diagnosis & Repair

Diagnosis & Repair

WARNING: This page is about a different car, the 2003 Toyota 4Runner. However, it is still accessible from the selected car via links, so may be relevant.
  1. Connect Toyota hand-held tester or scan tool to Data Link Connector (DLC3) at driver's side of instrument panel. See Figure. Turn ignition on and then turn hand-held tester or scan tool on.
  2. Using hand-held tester or scan tool, read engine coolant temperature for ECT sensor. If displayed engine coolant temperature is -40°F (-40°C), go to next step. If displayed engine coolant temperature is 284°F (140°C) or more, go to step  8. If displayed engine coolant temperature is same as actual engine coolant temperature, problem is intermittent. Check for defective connections or intermittent problem in wiring between ECT sensor and ECM. ECT sensor is located behind upper timing belt cover, on top of intake manifold and contains Black 2-pin electrical connector with Brown and Red/Blue wires. ECM is located behind glove box. See Figure.
  3. Turn ignition off. Disconnect ECT sensor 2-pin connector. ECT sensor is located behind upper timing belt cover, on top of intake manifold and contains Black 2-pin electrical connector with Brown and Red/Blue wires. Connect jumper wire between both terminals on electrical connector for ECT sensor.
  4. Turn ignition on. Using hand-held tester or scan tool, read engine coolant temperature for ECT sensor. If displayed engine coolant temperature is less than 284°F (140°C), go to next step. If displayed engine coolant temperature is 284°F (140°C) or more, check for defective electrical connections at ECT sensor and electrical connector. If electrical connections are defective, repair as necessary. If electrical connections are okay, replace ECT sensor.
  5. Turn ignition off. Remove jumper wire. Remove glove box for access to ECM with electrical connectors still installed on ECM. See Figure. Ensure electrical connectors at ECM are securely installed so all terminals in electrical connectors are contacting terminals in ECM.
  6. Ensure electrical connector at ECT sensor is still disconnected. Connect jumper wire between ECM 34-pin connector E4 terminals No. 19 (Red/Blue wire) and No. 28 (Brown wire). See Figure. This is the E2 and THW terminals on ECM.
  7. Turn ignition on. Using hand-held tester or scan tool, read engine coolant temperature for ECT sensor. If displayed engine coolant temperature is 284°F (140°C) or more, repair open Brown wire or Red/Blue wire or connectors between ECT sensor and ECM. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article. If displayed engine coolant temperature is not 284°F (140°C) or more, replace ECM.
  8. Turn ignition off. Disconnect electrical connector at ECT sensor. ECT sensor is located behind upper timing belt cover, on top of intake manifold and contains Black 2-pin electrical connector with Brown and Red/Blue wires.
  9. Turn ignition on. Using hand-held tester or scan tool, read engine coolant temperature for ECT sensor. If displayed engine coolant temperature is not -40°F (-40°C), go to next step. If displayed engine coolant temperature is -40°F (-40°C), replace ECT sensor.
  10. Turn ignition off. Remove glove box for access to ECM with electrical connectors still installed on ECM. See Figure. Disconnect ECM 34-pin connector E4. See Figure. Ensure electrical connector is still disconnected at ECT sensor.
  11. Turn ignition on. Using hand-held tester or scan tool, read engine coolant temperature for ECT sensor. If displayed engine coolant temperature is -40°F (-40°C), repair short in wiring harness and electrical connectors between ECT sensor and ECM. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article. If displayed engine coolant temperature is not -40°F (-40°C), replace ECM.
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