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Engine Electrical Diagnostic System Check

  1. Perform battery inspection test. See BATTERY TESTING & INSPECTION  under ON-VEHICLE TESTING. 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 - MONTANA, SILHOUETTE & VENTURE article in ACCESSORIES & EQUIPMENT.
  3. Using scan tool, attempt communication with Instrument Panel Cluster (IPC) and Powertrain Control Module (PCM) on the class 2 serial data circuit. If scan tool communicates with IPC and PCM, go to next step. If scan tool does not communicate with IPC and PCM, repair communications concern. See BODY CONTROL MODULES - MONTANA, SILHOUETTE & VENTURE article in ACCESSORIES & EQUIPMENT.
  4. Using scan tool, select DISPLAY DTCs function for each module. Record all DTCs displayed, DTC status and module which set the DTC. If scan tool displayed 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 - MONTANA, SILHOUETTE & VENTURE 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, B1001 or B1004, repair these DTCs first. See BODY CONTROL MODULES - MONTANA, SILHOUETTE & VENTURE article in ACCESSORIES & EQUIPMENT. If scan tool does not display DTC B1000, B1001 or B1004, perform appropriate test. See BODY CONTROL MODULES - MONTANA, SILHOUETTE & VENTURE article in ACCESSORIES & EQUIPMENT.
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