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Engine Electrical Diagnostic System Check

  1. Test charging system. See appropriate GENERATORS & REGULATORS article in STARTING & CHARGING SYSTEMS. Repair as necessary. if charging system tests okay, go to next step.
  2. Ensure ignition switch is in OFF position. Connect scan tool to Data Link Connector (DLC). If scan tool powers up, go to next step. If scan tool does not power up, see TEST B: SCAN TOOL INOPERATIVE  under SYSTEM TESTS.
  3. Using scan tool, attempt to communicate with BCM, Driver Information Center (DIC), Instrument Panel Cluster (IPC) and PCM. If scan tool successfully communicates with specified modules, go to next step. If scan tool does not communicate with specified modules, see TEST A: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE  under SYSTEM TESTS.
  4. Select display DTCs function for each module. If DTCs are retrieved, go to next step. If DTCs are not retrieved, repair by symptom. See appropriate GENERATORS & REGULATORS article in STARTING & CHARGING SYSTEMS.
  5. If scan tool displays DTCs which begin with "U", see TEST A: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE  under SYSTEM TESTS. If any other DTCs are displayed, go to next step.
  6. Repair as necessary. See DIAGNOSTIC TROUBLE CODE DEFINITIONS .
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