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Powertrain Diagnostic System Check

NOTE: Check for applicable Technical Service Bulletins (TSBs) before proceeding. DO NOT perform the following procedure if driveability conditions are not present. DO NOT turn ignition off during the following procedure or clear DTCs unless instructed to do so.
  1. Turn ignition on. Observe MIL. If MIL is illuminated, go to next step. If MIL is not illuminated, go to MALFUNCTION INDICATOR LIGHT DIAGNOSIS  under SYSTEM TESTS.
  2. Turn ignition off. Connect scan tool to DLC. Turn ignition on. Using scan tool, attempt to display PCM data. If scan tool displays PCM data, go to next step. If scan tool does not display PCM data, go to DATA LINK CONNECTOR DIAGNOSIS  under SYSTEM TESTS.
  3. Attempt to start engine. If engine starts and continues to run, go to next step. If engine does not start and continue to run, go to NO-START DIAGNOSIS in appropriate BASIC DIAGNOSTIC PROCEDURES article.
  4. Using scan tool, display DTCs. If any DTCs are set, record freeze frame and failure records information using scan tool. Perform appropriate test under DIAGNOSTIC TESTS. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If not DTCs are set, go to next step.
  5. Compare PCM data values displayed on scan tool to typical engine scan data values. If values are within limits, system is okay. If values are not within limits, see appropriate SYSTEM & COMPONENT TESTING article.
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