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Engine Electrical Diagnostic System Check

  1. Perform battery inspection test. See BATTERY TESTING & INSPECTION  under ON-VEHICLE TESTING. After performing inspection, 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 step  3 . If scan tool does not power up, see SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE under SYSTEM TESTS in BODY CONTROL MODULES - ASTRO & SAFARI in ACCESSORIES & EQUIPMENT.
  3. Turn ignition switch to RUN position. Attempt communication with Body Control Module (BCM), Driver Information Center (DIC), Instrument Panel Cluster (IPC) and Powertrain Control Module (PCM) on Class 2 Serial Data Circuit. If scan tool communicates with all modules, go to next step. If scan tool does not communicate with all modules, see SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE under SYSTEM TESTS in BODY CONTROL MODULES - ASTRO & SAFARI in ACCESSORIES & EQUIPMENT.
  4. Using scan tool, select DISPLAY DTC function and retrieve any Body Control Module (BCM), Driver Information Center (DIC) Instrument Panel Cluster (IPC) and Powertrain Control Module (PCM). Record all displayed DTCs, DTC status, and module which set the DTC. If scan tool displays DTCs, go to next step. If scan tool does not display DTCs, 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 - ASTRO & SAFARI in ACCESSORIES & EQUIPMENT.
  6. If scan tool displays DTCs which begin with "B", see DIAGNOSTIC TROUBLE CODE DEFINITIONS in BODY CONTROL MODULES - ASTRO & SAFARI in ACCESSORIES & EQUIPMENT. If scan tool does not display DTCs which begin with "B", perform appropriate test in accordance with DTCs retrieved. See DIAGNOSTIC TROUBLE CODE DEFINITIONS  .
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