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Diagnostic Procedure

  1. Perform battery test and inspection. See BATTERY TESTING & INSPECTION  under ON-VEHICLE TESTING. If battery passed test, go to next step. If battery did not pass test, replace battery.
  2. Connect scan tool to Data Link Connector (DLC). Turn ignition switch to RUN position. If scan tool powers up, go to next step. If scan tool does not power up, diagnose communication system. See appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT.
  3. Turn ON the ignition, with the engine OFF. Attempt to communicate with the Powertrain Control Module (PCM). If scan tool communicates with PCM on the class 2 serial data circuit, go to next step. If scan tool does not communicate with modules, diagnose communication system. See appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT.
  4. Select DISPLAY DTCS function for the Powertrain Control Module (PCM). Record all DTCs displayed and DTC status. If scan tool displayed DTCs, go to next step. If scan tool does not display DTCs, diagnose charging system by symptom. See SYMPTOM INDEX  table under SYSTEM TESTS.
  5. If scan tool does not display DTCs that begin with "U", perform appropriate test in accordance with DTCs retrieved. See DIAGNOSTIC TROUBLE CODE DEFINITIONS  table. If scan tool displays DTCs that begin with "U", diagnose communication system. See appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT.
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