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Engine Electrical Diagnostic System Check

  1. Perform battery inspection test. See BATTERY TESTING & INSPECTION  under ON-VEHICLE TESTING. After performing testing, go to next step.
  2. Connect scan tool to Data Link Connector (DLC). See COMPONENT LOCATIONS  . Turn ignition switch to RUN position. 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 in BODY CONTROL MODULES - MONTANA, SILHOUETTE & VENTURE article in ACCESSORIES & EQUIPMENT.
  3. Turn ignition switch to RUN position. Using scan tool, attempt to communicate with Instrument Panel Cluster (IPC) and Powertrain Control Module (PCM). If scan tool communicates with each module, go to next step. If scan tool does not communicate with each module, see SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE under SYSTEM TESTS in BODY CONTROL MODULES - MONTANA, SILHOUETTE & VENTURE article in ACCESSORIES & EQUIPMENT.
  4. Using scan tool, select DISPLAY DTC function and retrieve any IPC or PCM DTCs. Record all displayed DTCs, status of displayed DTCs and module that set the DTC. If any DTCs are retrieved, go to next step. If no DTCs are retrieved, repair charging system by symptom. See SYMPTOM INDEX  table under SYSTEM TESTS.
  5. If scan tool does not display DTCs which begin with "U", go to next step. If scan tool displays DTCs which begin with "U", see SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE under SYSTEM TESTS in BODY CONTROL MODULES - MONTANA, SILHOUETTE & VENTURE article in ACCESSORIES & EQUIPMENT.
  6. If scan tool displays DTCs B1000, B1001, or B1004, repair these DTCs first. See DIAGNOSTIC TROUBLE CODE DEFINITIONS in BODY CONTROL MODULES - MONTANA, SILHOUETTE & VENTURE article in ACCESSORIES & EQUIPMENT. If scan tool displays any other DTCs, perform appropriate test. See DIAGNOSTIC TROUBLE CODE INDEX  table.
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