Automotive Electronic Fuel Injection Course

Lesson 1 • Fuel Properties and Handling Safety

Examines gasoline volatility, ethanol blends, and fuel quality standards. Establishes safe handling practices essential before any hands-on lab work.

Lesson 2 • Fuel System Architecture Overview

Introduces the major subsystems: fuel storage, delivery, metering, and induction. Connects physical layout to functional flow for the entire fuel system.

Lesson 3 • Internal Combustion Engine Basics

Covers the four-stroke cycle, air-fuel mixture requirements, and combustion chemistry. Establishes the engine context that all fuel injection concepts depend on.

Lesson 1 • Actuator Control Strategies

Explains how the ECU drives injectors, relays, and solenoids using duty-cycle and pulse-width modulation. Links control strategy to measurable engine outcomes.

Lesson 2 • ECU Calibration and Lookup Tables

Introduces fuel maps, ignition maps, and interpolation methods stored in ECU memory. Provides the conceptual basis for later diagnostic and tuning chapters.

Lesson 3 • Introduction to the Engine Control Unit

Defines the ECU's role as the central processor for fuel and ignition management. Connects hardware architecture to real-time engine control decisions.

Lesson 4 • Closed-Loop and Open-Loop Control

Distinguishes feedback-driven closed-loop from fixed open-loop fuel control modes. Students identify when each mode is active and why it matters.

Lesson 1 • Oxygen and Wideband Lambda Sensors

Covers narrowband zirconia and wideband UEGO sensor construction and output. Lambda feedback is the foundation of closed-loop fuel correction.

Lesson 2 • Mass Airflow and Manifold Pressure Sensors

Covers hot-wire MAF and MAP sensor operating principles and output signals. These sensors provide the primary load inputs for fuel calculation.

Lesson 3 • Engine Temperature Sensors

Covers coolant temperature and intake air temperature NTC thermistor sensors. Temperature data drives cold-start enrichment and timing corrections.

Lesson 4 • Throttle Position and Pedal Sensors

Examines potentiometer and Hall-effect TPS designs and their role in load detection. Connects throttle angle data to acceleration enrichment and idle control.

Lesson 1 • Electric Fuel Pump Operation and Testing

Covers in-tank and inline pump designs, pressure regulation, and current draw testing. Pump performance directly determines injector operating conditions.

Lesson 2 • Injector Testing and Flow Matching

Covers electrical resistance testing, balance testing, and ultrasonic cleaning evaluation. Flow-matched injectors ensure cylinder-to-cylinder fuel distribution accuracy.

Lesson 3 • Fuel Injector Construction and Operation

Details solenoid injector internals, spray patterns, and flow rates. Understanding injector mechanics is prerequisite to diagnosing injection faults.

Lesson 4 • Fuel Rail and Pressure Regulation

Examines returnless and return-style fuel rail designs and pressure regulator function. Stable rail pressure is essential for accurate injector pulse-width calculation.

Lesson 1 • Oscilloscope Use for EFI Signals

Teaches waveform capture and analysis for sensors, injectors, and actuators. Oscilloscope data reveals faults invisible to scan tool voltage readings.

Lesson 2 • Multimeter Testing for EFI Circuits

Applies voltage, resistance, and current testing to EFI sensors and actuator circuits. Multimeter skills complement scan tool data for circuit-level fault isolation.

Lesson 3 • Scan Tool Data Interpretation

Covers live data PIDs, freeze-frame data, and readiness monitors on professional scan tools. Accurate PID interpretation is the first step in systematic diagnosis.

Lesson 4 • Fuel Pressure and Volume Testing

Covers gauge connection, pressure drop tests, and volume-over-time measurement. Fuel delivery faults are confirmed only through direct pressure and flow testing.

Lesson 1 • Diagnosing Rich Mixture Conditions

Identifies causes of negative fuel trim including leaking injectors, high fuel pressure, and faulty sensors. Rich conditions waste fuel and damage catalytic converters.

Lesson 2 • Diagnosing Lean Mixture Conditions

Identifies causes of positive fuel trim including vacuum leaks, weak pumps, and dirty MAF sensors. Lean conditions raise trim values and risk engine damage.

Lesson 3 • Fuel Trim Fundamentals

Defines short-term and long-term fuel trim, their calculation, and normal operating ranges. Fuel trim is the ECU's record of how far actual mixture deviates from target.

Lesson 4 • RPM and Load-Dependent Trim Patterns

Teaches how trim values shift across idle, cruise, and wide-open throttle to isolate fault location. Load-dependent patterns distinguish sensor faults from mechanical faults.

Lesson 1 • Intermittent Fault Diagnosis

Covers data logging, freeze-frame capture, and stress testing to reproduce intermittent faults. Intermittent faults require evidence capture rather than static testing alone.

Lesson 2 • Evaporative Emission System Diagnosis

Covers EVAP system components, purge valve operation, and leak detection monitor logic. EVAP faults frequently affect fuel trim and require dedicated diagnostic steps.

Lesson 3 • Network Communication and ECU Faults

Addresses CAN bus communication errors, ECU power supply faults, and module replacement protocols. Network faults can mimic sensor failures and must be ruled out systematically.

Lesson 4 • Injector and Ignition Misfire Diagnosis

Differentiates fuel-related from ignition-related misfires using misfire counters and cylinder contribution tests. Accurate misfire attribution prevents replacing the wrong components.

Lesson 1 • ECU Relearn and Adaptation Procedures

Explains idle relearn, throttle position relearn, and fuel trim reset after repairs. Skipping relearn procedures causes driveability complaints after otherwise correct repairs.

Lesson 2 • Scheduled EFI Maintenance Procedures

Covers fuel filter replacement, injector cleaning intervals, and throttle body service. Preventive maintenance preserves fuel system accuracy and extends component life.

Lesson 3 • Injector Replacement and Seal Service

Details injector removal, O-ring replacement, and reinstallation torque procedures. Proper sealing prevents fuel leaks and maintains correct injector spray angle.

Lesson 4 • Fuel Pump Replacement Procedures

Covers in-tank pump module removal, strainer replacement, and priming after installation. Correct pump installation prevents premature failure and delivery faults.