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Home >> Saturn >> 1998 >> SW2 Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Diagnostic Trouble Codes >> DTC P0118 - ECT Sensor Circuit Temperature Out Of Range - High >> Diagnostic Procedures

Diagnostic Procedures

  1. Turn ignition on. Connect scan tool and monitor ECT sensor reading. If ECT reading is greater than 284°F (140°C), go to next step. If ECT reading is not greater than 284°F (140°C), check cooling system. Problem is intermittent. See DIAGNOSTIC AIDS.
  2. Disconnect ECT sensor harness connector. If ECT reading is less than -32°F (-35°C), replace ECT sensor. If ECT reading is not less than -32°F (-35°C), go to next step.
  3. Turn ignition off. Disconnect PCM harness connector J2. Remove ECT sensor signal circuit terminal from PCM harness connector. Reconnect PCM harness connector. Turn ignition on. If ECT sensor reading is less than -32°F (-35°C), check signal circuit for short to ground or shorted to ECT ground circuit. If ECT sensor reading is not less than -32°F (-35°C), replace PCM.
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