This module covers DSO testing techniques for Honda ignition systems, focusing on both distributor-based and coil-on-plug configurations.

Topics include:

• Non-floating VR sensor inputs and how to accurately capture them with a scope referenced to vehicle ground
• Common failure points: igniters, coils, distributor bearings, and PCM water damage
• The igniter's role as the voltage source on the IC line and why misunderstanding this leads to misdiagnosis
• Action/reaction testing to isolate igniter vs. coil vs. ECU faults
• Primary current analysis for identifying weak or failed coils
• How coil failures can stress and subsequently damage igniters
• COP system differences, including internal ICM designs and why current becomes the primary diagnostic signal when voltage access is limited

The module emphasizes applying creative lab scope technique and action/reaction testing principles to Honda-specific ignition systems across multiple platforms including Civic, Accord, Integra, Prelude, and Acura applications.