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Home >> Pontiac >> 2003 >> Grand Am SE, 2.2 F, Standard >> Repair and Diagnosis >> Electrical >> Charging Systems >> Charging System >> On-Vehicle Testing >> Engine Electrical Diagnostic System Check >> Diagnostic Procedure

Diagnostic Procedure

  1. Perform battery inspection test. See BATTERY TESTING & INSPECTION  under ON-VEHICLE TESTING. After performing battery inspection, go to next step.
  2. Connect scan tool to DLC. See COMPONENT LOCATIONS  . Turn ignition switch to RUN position. If scan tool powers up, go to next step. If scan tool does not power up, see BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT.
  3. Turn ON the ignition, with the engine OFF. Attempt to communicate with each of the following modules on the class 2 serial data circuit:
    • Body Control Module (BCM).
    • Instrument Panel Cluster (IPC).
    • Powertrain Control Module (PCM).
    The scan tool should communicate with all modules on the class 2 serial data circuit. If communication is as specified, go to next step. If communication is as not specified, see appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT.
  4. Using scan tool, select DISPLAY DTC function for BCM, IPC and PCM. If scan tool displays any DTCs, go to next step. If scan tool does not display any DTCs, diagnose 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", perform appropriate test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS in appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT.
  6. If scan tool displays DTC B1000 or B1001, repair these DTCs first. See appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT. If scan tool displays any other DTCs, perform appropriate test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS  .
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