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Home >> Cadillac >> 1998 >> Catera >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Tests W/Codes >> Diagnostic Trouble Codes >> DTC P0116 - ECT Sensor Circuit Performance >> Diagnostic Procedures
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Diagnostic Procedures

  1. Perform POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK  , then 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 greater than -45°F (-43°C), go to DTC P0110 (IAT SENSOR CIRCUIT).
  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 less than 282°F (139°C), go to DTC P0110 (IAT SENSOR CIRCUIT).
  4. Replace ECT sensor. After replacing sensor, 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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