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DTC P0118: Engine Coolant Temperature (ECT) Sensor Circuit High Input

  1. Connect scan tool to Data Link Connector (DLC). Turn ignition on. Select ECT sensor parameter on scan tool. If scan tool displays -40°F (-40°C), go to next step. If scan tool display is not as specified, check for an intermittent problem. See TROUBLE SHOOTING - NO CODES article.
  2. Disconnect ECT sensor harness connector. Check for poor ECT sensor connection or bent terminals at ECT sensor. Repair as necessary. If connection and terminals are okay, test voltage at ECT sensor harness connector Orange/Black wire. If voltage is between 4-6 volts, go to next step. If voltage is not as specified, repair open or short circuit in Orange/Black wire, or poor connection at PCM.
  3. Connect a fused jumper wire between ECT sensor connector Orange/Black Blue wires. If scan tool displays 327°F (164°C), replace ECT sensor. If scan tool display is not as specified, check Black wire for open circuit or poor PCM harness connections. Repair as necessary. If connections are okay, replace PCM and retest system.
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