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Home >> Cadillac >> 2000 >> Catera >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - 3.0L >> Diagnostic Tests >> DTC P0116: ECT Sensor Circuit Performance >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing OBD system check, go to next step.
  2. Disconnect ECT sensor connector. Observe scan tool display. If ECT sensor temperature is less than -45°F (-43°C), go to next step. If ECT sensor temperature is -45°F (-43°C) or greater, diagnose using DTC P0115.
  3. Jumper ECT sensor harness connector terminals. Observe scan tool display. If ECT sensor temperature is greater than 282°F (139°C), go to next step. If ECT sensor temperature is not greater than 282°F (139°C), diagnose using DTC P0115.
  4. Replace ECT sensor. After repairs, go to next step.
  5. Using scan tool, clear DTCs. Turn ignition off for 15 seconds. Start engine and let idle. Check for DTCs. If DTC P0116 is set, go to step  2 . If DTC P0116 is not set, go to next step.
  6. If other DTCs were present during OBD system check and have not been diagnosed, go to applicable DTC. If no other DTCs are present, system is okay.
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