LBT-525 Fuel Trim Analysis
Available at No Additional Charge with Membership
Description
Fuel Trim Diagnostics & Fuel System Analysis is an advanced diagnostic training course designed for automotive technicians, drivability specialists, and diagnosticians who want a deeper understanding of modern fuel control strategies and OBD-II fuel system monitoring. This course combines foundational air/fuel ratio theory with practical diagnostic procedures used to analyze fuel trims, evaluate sensor accuracy, and identify real-world drivability faults.
Students learn how the ECM calculates fuel delivery, how short-term, long-term, rear, and total fuel trims interact, and how to diagnose issues caused by injectors, sensor errors, fuel quality problems, vacuum leaks, exhaust leaks, and mechanical engine conditions. Using scan tools, five-gas analyzers, and fuel testing equipment, technicians will learn to interpret live data and apply proven diagnostic strategies during real driving conditions.
Topics Covered:
Fuel trim fundamentals and ECM fuel strategy
Short-term, long-term, and rear fuel trim interpretation
Air/fuel ratio and lambda analysis
Oxygen sensor operation and fuel control feedback
Injector pulse width and fuel delivery basics
Sensor inputs and their impact on fuel control (MAF, MAP, ECT, IAT)
Vacuum leaks, exhaust leaks, and mechanical fault diagnosis
Scan tool data analysis and road test fuel trim evaluation
Objectives:
Explain how the ECM manages fuel delivery and fuel trims
Interpret fuel trim data to diagnose drivability issues
Analyze air/fuel ratio using scan tools and exhaust gas feedback
Identify how sensor, fuel, and mechanical faults affect fuel control
Perform structured diagnostics using live scan data and road testing
Apply systematic troubleshooting to modern fuel control systems
Runtime = 48 minutes
Credit Hours = 1.25
