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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. Check if MIL stays on when engine is running. Check for engine performance or driveability problem. Check if a suspected fault in a PCM controlled component or a PCM controlled system. If a problem is found, go to next step. If no problem is found, system is okay.
  2. Turn ignition, with engine off. Observe MIL. If MIL is illuminated, go to next step. If MIL is not illuminated, go to MIL INOPERATIVE  under CIRCUIT TESTS.
  3. Turn ignition off. Install scan tool. Turn ignition on, with engine off. If scan tool displays any PCM data, go to next step. If scan tool does not display any PCM data, go to DATA LINK CONNECTOR DIAGNOSIS  under CIRCUIT TESTS.
  4. Start engine. If engine starts and runs, go to next step. If engine does not start or starts but will not run, go to appropriate NO START - ENGINE CRANKS OKAY under NO START DIAGNOSIS in appropriate BASIC DIAGNOSTIC PROCEDURES article.
  5. Observe DTC data. Save any DTC, any FREEZE FRAME/FAILURE RECORD data. If any DTCs are set, diagnose affected DTCs. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no DTCs are set, go to next step.
  6. If MIL is illuminated and no DTCs are set, go to MIL ON STEADY  under CIRCUIT TESTS. If MIL is not illuminated and no DTCs are set, go to next step.
  7. Compare scan tool data display with values shown in appropriate PID VALUE table in appropriate PIDS VALUE CHARTS article. If displayed values are normal or within the typical values range, problem is intermittent. See INTERMITTENTS in appropriate TROUBLE SHOOTING - NO CODES article. If displayed values are not within specified ranges, diagnose suspect components. See appropriate SYSTEM & COMPONENT TESTING article.
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