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Home >> Cadillac >> 1998 >> Catera >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Tests W/Codes >> Diagnostic Trouble Codes >> DTC P1601 ECM OVERTEMPERATURE >> Diagnostic Procedures
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Diagnostic Procedures

  1. Perform POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK  , then go to next step.
  2. Using scan tool, clear DTCs. Turn ignition off for 15 seconds. Allow ECM to cool down. Start engine and operate vehicle. Check for DTCs. If DTC P01601 is set, go to step 4). If DTC P01601 is not set, go to next step.
  3. Ensure ECM and/or other components are properly mounted in engine compartment relay center. Ensure relay center cover is installed properly and that relay center is not damaged. Check for debris and other obstructions in airflow path. Check for debris in fan and fan air inlet. Repair as necessary. If no problem is found, and fans do not operate, see SYSTEM/COMPONENT TESTS article to diagnosis electric cooling fans.
  4. Replace ECM. New ECM must be programmed with theft deterrent module frequency code currently on vehicle.
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