The complete EFI diagnostic reference for 2003–2017 Harley-Davidson motorcycles. Guided troubleshooting, circuit diagrams, DTC codes, and torque specs — all in your pocket.
Step-by-step yes/no decision trees that walk you through identifying the root cause of common EFI and electrical issues.
Detailed wiring diagrams for all major systems — ignition, fuel, starter, sensors, security, and more.
Search diagnostic trouble codes with plain-language explanations, common causes, and recommended fixes.
Complete torque specs organized by system for Twin Cam and Evo Sportster engines. Searchable and filterable.
Save up to 3 motorcycle profiles with full specs, service records, diagnostic history, and personalized notes.
Generate branded diagnostic reports with circuit diagrams, findings, and recommendations — ready to share or print.
Track maintenance schedules linked to your motorcycle's mileage. Never miss an oil change or inspection again.
All diagnostic data is stored locally on your device. Use the app in the garage, on the road, or anywhere without internet.
Quick access with Face ID or fingerprint. Your data stays secure and private on your device.
Covers all Harley-Davidson motorcycles with Delphi Electronic Fuel Injection (2003–2017)
Twin Cam 88 / 96 / 103 / 110 / 117 and Evolution Sportster 883 / 1200 engines
Choose your year, model family, sub-model, and engine. The app tailors diagnostics to your specific bike.
Pick from categories like "Won't Start," "Runs Rough," "Electrical Issue," or "Brake/Suspension" to begin.
Answer simple yes/no questions. The app narrows down the cause step by step with pro tips along the way.
Receive a clear finding with the likely cause, related DTCs, circuit diagram, and recommended next steps.
Save results to your garage profile, generate a PDF report, or start a new diagnostic — all from one screen.
Download American V-Twin Diagnostics and take the guesswork out of EFI troubleshooting.
$4.99/month — Cancel anytime