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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. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, near steering column. 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. See appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT.
  3. Turn ignition switch to RUN position. Attempt to communicate with each module on class 2 serial data circuit. If scan tool communicates with each module, go to next step. If scan tool does not communicate with each module, perform TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE under SYSTEM TESTS. See 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 module which stored 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 does not display any DTCs which begin with "U", go to next step. If scan tool displays any DTCs which begin with "U", perform TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE under SYSTEM TESTS. See appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT.
  6. If scan tool displays DTCs B1000, B1004, B1007 or B1009, perform appropriate test in accordance with DTC retrieved. See appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT. If scan tool does not display DTCs B1000, B1004, B1007 or B1009, perform appropriate test in accordance with DTC retrieved. See DIAGNOSTIC TROUBLE CODE DEFINITIONS  .
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