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Engine Electrical Diagnostic System Check

  1. Perform battery inspection test. See BATTERY TESTING & INSPECTION . After performing inspection, 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 step  4. If scan tool does not power up, go to Scan Tool Does Not Communicate With Class 2 Device in BODY CONTROL SYSTEM .
    3. NOTE: The engine may start during the following step. Turn OFF the engine as soon as you have observed the Crank power mode.
  3. Access the Class 2 Power Mode in the Diagnostic Circuit Check on the scan tool. Rotate the ignition switch through OFF, RUN, and CRANK positions while observing the ignition switch power mode parameter. If ignition switch parameter reading matches the ignition switch positions for OFF, RUN and CRANK positions, go to next step. If ignition switch parameter reading does not match the ignition switch positions for OFF, RUN and CRANK positions, go to Power Mode Mismatch in BODY CONTROL SYSTEM .
  4. 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, go to Scan Tool Does Not Communicate With Class 2 Device in BODY CONTROL SYSTEM .
  5. 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.
  6. If scan tool does not display DTCs which begin with "U", go to next step. If scan tool displays DTCs which begin with "U", go to Scan Tool Does Not Communicate With Class 2 Device in BODY CONTROL SYSTEM .
  7. If scan tool displays DTCs which begin with "B", go to Diagnostic Trouble Code Definitions in BODY CONTROL SYSTEM . 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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