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Engine Electrical Diagnostic System Check

  1. Perform battery inspection test. See BATTERY TESTING & INSPECTION  under ON-VEHICLE TESTING. If problem exists, repair as necessary. If problem does not exist, go to next step.
  2. Connect scan tool to Data Link Connector (DLC). 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 BODY CONTROL MODULES - AZTEK article in ACCESSORIES & EQUIPMENT.
  3. Using scan tool, attempt communication with Body Control Module (BCM), Instrument Panel Cluster Module (IPC) and Powertrain Control Module (PCM) on class 2 serial data circuit. If communication is established with each module, go to next step. If communication is not established with each module, repair communications concern. See BODY CONTROL MODULES - AZTEK article in ACCESSORIES & EQUIPMENT.
  4. Using scan tool, select DISPLAY DTC function for each module. Record all displayed DTCs, status of displayed DTCs and module that set the DTC. If scan tool displays any DTCs, go to next step. If scan tool does not display any DTCs, repair starting system by symptom. See SYMPTOM INDEX  table under SYSTEM TESTS.
  5. If scan tool displays DTCs which begin with "U", perform appropriate test. See BODY CONTROL MODULES - AZTEK 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, repair this DTC first. See BODY CONTROL MODULES - AZTEK article in ACCESSORIES & EQUIPMENT. If scan tool does not display DTCs B1000, perform appropriate test. See BODY CONTROL MODULES - AZTEK article in ACCESSORIES & EQUIPMENT.
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