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Diagnostic Procedures

  1. Perform POWERTRAIN DIAGNOSTIC SYSTEM CHECK  under DIAGNOSTIC SYSTEM CHECKS. If DTC or driveability concerns were repaired using powertrain diagnostic system check, go to step  3. If no DTC or driveability concerns were repaired using powertrain diagnostic system check, go to next step.
  2. Check for applicable Technical Service Bulletins (TSB) for software updates that may prevent I/M readiness. Perform any reprogramming or repairs indicated by TSBs. If reprogramming or repair service is required, go to INSPECTION/MAINTENANCE COMPLETE SYSTEM SET PROCEDURE  under PROGRAMMING. If reprogramming or repair service is not required, go to next step.
  3. Using scan tool, observe I/M SYSTEM STATUS display. If more than one test indicates a NO status, go to INSPECTION/MAINTENANCE COMPLETE SYSTEM SET PROCEDURE  under DRIVE CYCLES. If only one test indicates a NO status, go to appropriate I/M system set procedure for the indicated system in appropriate SYSTEM & COMPONENT TESTING article.
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