John operates a mobile diagnostic business in the Chicagoland area. John assists his repair shop customers with both engine and transmission driveability concerns, module programming, bus communication issues, and electrical diagnosis. John has over 35 years of experience diagnosing vehicles using a wide variety of diagnostic tools. John also conducts training seminars locally and nationally for professional repair technicians through Autotrain, Inc. These seminars combine real world problem solving with system operation. These seminars focus on developing efficient diagnostic techniques through a thorough understanding of both the system under discussion and the diagnostic tools available.