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Home >> Cadillac >> 1996 >> Eldorado Base >> 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 On-Board Diagnostic (OBD) System Check. After performing OBD system check, go to next step.
  2. If DTC(s) P0117 or P0118 is present, diagnose affected DTC(s) first. If DTC(s) are not present, go to next step.
  3. Turn ignition on. Using scan tool, select FAILURE REC under DTC mode and note ECT display. If the snapshot for ECT sensor reading is -35°F (-37°C) or less, go to next step. If snapshot ECT sensor reading is greater than -35°F (-37°C), go to step 5).
  4. An intermittent high resistance reading occurred on the ECT sensor circuit. Check for open in ECT sensor ground and signal circuits. Repair as necessary. If circuits are okay, go to step 7).
  5. If ECT snapshot reading is greater than 247°F (147°C), go to next step. If ECT snapshot reading is less than 247°F (147°C), go to step 7).
  6. An intermittent low resistance reading occurred on the ECT sensor circuit. Check for short to ground in ECT sensor signal circuit. Repair as necessary. If circuits are okay, go to next step.
  7. Allow engine to cool to less than 95°F (35°C). Start engine and raise ECT sensor temperature from cool to warm. As ECT sensor warms, watch ECT sensor reading on scan tool. Look for a skip or jump in the value. If a skip or jump is noted, go to next step. If value did not skip or jump, see DIAGNOSTIC AIDS.
  8. Replace ECT sensor.
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