This module continues the exploration of Toyota primary ignition diagnosis, picking up with real-world case studies on ESA and VAST systems before transitioning into DIS applications.

Key topics covered include:

• Diagnosing intermittent ignition faults using IGT, coil primary, and injector waveforms as action/reaction pairs
• How the VAST system differs from ESA, including base timing mode, the igniter's role in digitizing the analog NE signal, and how no-spark diagnosis requires a different approach
• Identifying igniter failures on VAST systems using digital and analog NE captures
• How IGF enables injection and how a loss of injection with valid IGF can point to an ECU issue
• DIS system wiring and signal relationships, including IGT-controlled dwell, current ramp shape, and IGF behavior with dual coils sharing a single ECU pin

The module wraps up with a summary of the three-legged stool approach as it applies to Toyota ignition diagnosis and how these techniques extend to any vehicle platform.