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Home >> Cadillac >> 2001 >> Seville SLS >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Self-Diagnostics - 4.6L >> Diagnostic System Checks >> Engine Electrical Diagnostic System Check
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Engine Electrical Diagnostic System Check

  1. Ensure battery is correct battery for vehicle. Ensure battery is fully charged and in good working condition. Replace battery as necessary. If battery is okay, go to next step.
  2. Connect scan tool, if not already connected. Turn ignition on. If scan tool powers up, go to next step. If scan tool does not power up, see SCAN TOOL DOES NOT POWER UP  under SYSTEM TESTS.
  3. Using scan tool, attempt to communicate with attempt to communicate with each module on class 2 serial data circuit. If scan tool communicates with all modules on class 2 serial data circuit, go to next step. If scan tool does not communicate with all modules on class 2 serial data circuit, diagnose communication problem. See TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE under SYSTEM TESTS in appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT.
  4. Using scan tool, select display DTCs function. If scan tool displays any DTCs, go to next step. If scan tool does not display DTCs, repair charging system by symptom. See appropriate GENERATORS & REGULATORS article in STARTING & CHARGING SYSTEMS.
  5. If scan tool displays any DTCs that begin with "U", diagnose communication problem. See TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE under SYSTEM TESTS in appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT. If scan tool does not display any DTCs that begin with "U", go to next step.
  6. If scan tool displays DTC B1000, B1007 or B1009, repair as necessary. See appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT. If scan tool does not display DTC B1000, B1007 or B1009, repair other DTCs as necessary. See DIAGNOSTIC TROUBLE CODE DEFINITIONS .
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