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DTC P0116: Engine Coolant Temperature (ECT) Circuit Range/Performance Problem

  1. Connect scan tool to Data Link Connector (DLC). Turn ignition on. Select ECT sensor parameter on scan tool. Make note of coolant temperature displayed on scan tool (ECT1). Start engine and warm up to operating temperature. Recheck coolant temperature displayed on scan tool (ECT2). If difference between ECT1 and ECT2 is 2°F (1°C) or less, go to next step. If difference is not as specified, inspect thermostat and replace if necessary.
  2. Turn ignition off. Disconnect ECT sensor harness connector. Use a fused jumper to connect Orange/Black wire to Blue wire. Scan tool should display 327°F (164°C). Disconnect jumper wire from ECT sensor harness connector. Scan tool should now indicate a temperature of -40°F (-40°C). If readings are as specified, go to next step. If readings are not as specified, repair open or short circuit in Orange/Black or Blue wire. If circuits are okay, replace PCM and retest system.
  3. Use DVOM to measure resistance of ECT sensor. See ENGINE SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING article. If sensor resistance is not as specified, replace ECT sensor. If sensor resistance is as specified, check for an intermittent problem. See TROUBLE SHOOTING - NO CODES article.
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