Tom wraps up several diagnostic case studies using the lab scope as the primary tool, focusing on real-world problems that don't follow predictable failure patterns.

Cases covered include:

• A pinched wire causing an intermittent high-resistance fault that worsens with heat
• A Subaru Loyale no-start traced to a blown fusible link causing backfeed through the idle speed solenoid and corrupting crank angle sensor signals
• A Toyota pickup with a random cut-out caused by a faulty vehicle speed sensor triggering fuel cut
• A Toyota Tercel with a completely dead ignition system, used to compare the diagnostic capabilities and limitations of the Modus scope versus the Pico

The Tercel case includes a detailed look at primary failure analysis, sample rate calculations, and a practical comparison of how trigger control and buffer management differ between the two instruments.