Diagnostic Mastery
Scopes, Meters, Thermal Cameras & Real-World Diagnosis
The diagnostic skills that separate a parts changer from a technician. From voltage drop testing to oscilloscope waveform analysis, thermal imaging to CAN bus diagnostics — 20 modules that teach you how to find what is actually broken, step by step.
Course Modules
The Diagnostic Mindset — How a Master Tech Thinks
Before you pick up a tool, learn how to THINK about problems. This is the difference between guessing and knowing.
Scan Tool Fundamentals — Connecting, Codes & Freeze Frame
Your scan tool is the most powerful diagnostic tool you own. Most techs use about 10% of what it can do.
Scan Tool Live Data — PIDs That Matter
Hundreds of data PIDs scroll by on your scan tool. Learn which ones to watch, what they should read, and what abnormal values tell you.
Mode 6 — The Data Nobody Uses (But Should)
Mode 6 shows you the actual test results the PCM ran internally. It tells you how close a system is to failing BEFORE it sets a code.
DVOM Fundamentals — Setting Up & Using Your Meter
The DVOM is your most important electrical tool. Most techs know how to turn it on. Few know how to use it properly.
Voltage Drop Testing — The #1 Diagnostic Test
If you only learn one electrical test in your entire career, make it voltage drop. It finds problems no other test can find.
Amperage Testing — Parasitic Draw & Component Load
How to measure current draw, diagnose parasitic battery drains, and verify component health through amperage.
Resistance Testing — When & How
When resistance testing is the right tool and when it will mislead you. Proper technique and interpretation.
Finding a Short to Ground
A blown fuse that keeps blowing. How to track down where copper meets ground when it should not.
Finding a Short to Voltage (Short to Power)
When a circuit gets voltage from somewhere it should not. Backfeed, chafed wiring, and crossed circuits.
Open Circuit Diagnosis
The circuit is dead. Power is not reaching the load. How to find the break in the wire without tearing the car apart.
Oscilloscope Fundamentals — Why Waveforms Matter
A DVOM gives you a number. A scope gives you the whole story. Learn what waveforms show you that a meter cannot.
Ignition & Injector Waveform Analysis
Reading ignition coil waveforms and injector patterns to find misfires, weak coils, and injector faults.
Relative Compression with a Scope
Test compression on all cylinders in 10 seconds without removing a single spark plug. The fastest compression test in the shop.
Sensor & Actuator Waveforms
CKP, CMP, throttle position, wheel speed, and other sensor waveforms. What good looks like and what bad looks like.
Thermal Camera Fundamentals
How infrared imaging works and what it reveals about electrical, mechanical, and HVAC problems.
Thermal Camera Applications — Electrical, Mechanical & HVAC
Real-world thermal camera diagnosis: hot connections, uneven brake temps, coolant flow patterns, and A/C distribution.
CAN Bus Diagnostics — Network Testing & Waveforms
Testing CAN high, CAN low, terminating resistors, and reading network waveforms to find communication faults.
Putting It All Together — Real-World Case Studies
Complete diagnostic walkthroughs from symptom to fix. Multiple vehicles, multiple systems, real shop scenarios.
Building Your Diagnostic Toolbox & Workflow
Essential tools, repeatable workflows, documentation habits, flat rate strategy, and how to keep growing as a diagnostic technician.