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Engine Electrical Diagnostic System Check

  1. Perform battery inspection test. See BATTERY TESTING & INSPECTION  under ON-VEHICLE TESTING. If battery passes test, go to next step.
  2. Install 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 TEST A: SCAN TOOL DOES NOT POWER UP under SYSTEM TESTS in appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT.
  3. Turn ignition switch to RUN position. Attempt to communicate with Body Control Module (BCM), Driver's Information Center (DIC), Instrument Panel Cluster (IPC) and Powertrain Control Module (PCM). If scan tool communicates with BCM, DIC, IPC and PCM, go to next step. If scan tool does not communicate with BCM, DIC, IPC and PCM, perform 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 for each module. Record all DTCs displayed, DTC status and specific module which set DTC. If scan tool displays any DTCs, go to next step. If scan tool does not display 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 in accordance with DTC retrieved. 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 DTCs which begin with "B", perform appropriate test in accordance with DTC retrieved. See appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT. If scan tool does not display DTCs which begin with "B", repair starting system by symptom. See SYMPTOM INDEX  table under SYSTEM TESTS.
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