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Home >> Cadillac >> 1996 >> Seville SLS >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Tests W/Codes >> Diagnostic Trouble Codes >> DTC P0125 - ECT Excessive Time To Reach Closed Loop >> 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. Turn ignition on. Using scan tool, select FAILURE REC. and note ECT display. If ECT sensor reads -35°F (-37°C) or less, diagnose using DTC P0117 test. If ECT sensor reads greater than -35°F (-37°C), go to next step.
  3. Start and warm engine to normal operating temperature. Using scan tool, select DATA LIST, ENGINE 1 and note ECT display while engine is warming up. If ECT reading is erratic or skipping (rapid changing), go to step 6). If ECT reading is normal, go to next step.
  4. After engine is fully warmed up (about 20 minutes), note ECT display. If ECT reading is less than 185°F (85°C), go to next step. If ECT reading is greater than 185°F (85°C), fault is not present. See DIAGNOSTIC AIDS.
  5. Check ECT sensor ground and signal circuits for high resistance. Repair as necessary. If circuits are okay, repair cooling system.
  6. Check terminal contact at ECT sensor. Repair as necessary. If terminal contact is okay, go to next step.
  7. Replace ECT sensor.
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