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Engine Electrical Diagnostic System Check

  1. Perform battery inspection test. See BATTERY TESTING & INSPECTION  under ON-VEHICLE TESTING. After inspection, go to next step.
  2. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel. Turn ignition switch to RUN position. If scan tool powers up, go to next step. If scan tool does not power up, perform appropriate test. See appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT.
  3. Turn ignition switch to RUN position. Using scan tool, attempt communication with each module on class 2 serial data circuit. If scan tool communicates with all modules, go to next step. If scan tool does not communicate with all modules, perform appropriate test. See appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT.
  4. Using scan tool, select DISPLAY DTCs function for each module. Record all displayed DTCs, DTC status, and module which set DTC. If scan tool displays DTCs, go to next step. If scan tool does not display DTCs, repair by charging system by symptom. See SYMPTOM INDEX  table under SYSTEM TESTS.
  5. If scan tool displays DTCs which begin with "U", perform appropriate test. See appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT. If scan tool does not display DTCs which begin with "U", go to next step.
  6. If scan tool displays DTC B1000, perform appropriate test. See appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT. If scan tool does not display DTC B1000, perform appropriate test in accordance with DTC retrieved. See DIAGNOSTIC TROUBLE CODE DEFINITIONS  .
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