Please call, text, or comment if you want to attend this class. There is no shame in not knowing something in this class. The shame comes when the vehicle is in your bay and you guess wrong. Test; don't guess. Dinner starts at 6pm class at 6:30pm. Finishes at 9 and you can leave any time. No charge for food or class to customers on Rome Tools and Rome Tools 2 trucks. Available only to customers on our route. Nice venue on Broad Street in Rome. Free door prizes.
Topics covered as time allows:
This class provides a practical approach to diagnosing modern vehicle performance issues, focusing on efficient data collection and analysis. Students will learn to quickly identify the root cause of common problems, such as rough running, misfires, and poor fuel economy. The curriculum is designed to equip technicians with the skills to effectively use diagnostic tools and interpret sensor data.
Initial Data Collection & Diagnostic Strategy
The first step in diagnosing a car that "isn't running right" is a systematic approach to data collection. We'll start with the basics: a thorough customer interview to understand the symptoms and history, followed by a visual inspection of key components like hoses, wires, and fluids. The class will then transition to using a diagnostic scanner to retrieve trouble codes and analyze live data.
Volumetric Efficiency & Fuel System Diagnostics
We will dive deep into volumetric efficiency (VE) testing, a powerful method for determining how well an engine is breathing. We'll explore how to calculate VE using a scan tool and pressure transducers to identify restrictions in the intake or exhaust system. This section also covers fuel trims, explaining both short-term (STFT) and long-term (LTFT) fuel trims and how they reveal issues with the fuel delivery system or air leaks. The class will also cover how to interpret misfire data, including cylinder-specific misfire counts, to pinpoint which cylinder is having issues.
Advanced Diagnostics with 5-Gas Analyzer
Learn to use a 5-gas exhaust analyzer to check the feedback system and confirm the health of the catalytic converter and air-fuel ratio. This section will cover the interpretation of CO, CO2, HC, O2, and NOx readings to identify rich/lean conditions, combustion inefficiencies, and catalyst performance issues. This is a critical step in verifying the effectiveness of the vehicle's emission control system.
Quick Diagnosis Techniques
The class will teach quick, effective ways to determine the cause of a misfire—whether it's fuel, ignition, or compression related. We'll use a variety of tools, including a scan tool, lab scope, and pressure transducers, to get a definitive answer quickly. We will also cover how to use Calculated Load (Cal Load) and Absolute Load (Abs Load) PIDs as indicators of engine health and performance. We'll also explore the critical role of air-fuel ratio sensors and O2 sensors in the feedback loop and how to interpret their signals to diagnose issues.
Tool Integration & Network Diagnostics
This section will focus on the practical use of diagnostic tools, including hooking up an Escan to a Snap-on Zeus to leverage the strengths of both tools. We'll also cover the fundamentals of Controller Area Network (CAN) communication. Students will learn a quick way to check CAN C for a good bus using a multimeter or lab scope to verify bus integrity and signal voltage. Finally, we'll cover a step-by-step process for what to do if you've lost the bus, including checking power/ground, terminating resistors, and isolating failed modules to restore network communication.
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