Identify ECCS systems and learn what vehicles use them.

Examine computer input and output signals.

Discover component locations, operation and testing procedures.

Learn to identify common system failures.

Perform self-diagnostic procedures; retrieve and interpret diagnostic trouble codes or two-mode and five-mode systems.

Use ECU lamps to diagnose air/fuel ratio problems, oxygen sensor operation, throttle valve switch operation, and vehicle speed sensor failures.

Use the “mode five” real-time function to diagnose the crank angle circuit and the fuel pump circuit.

Use the “checker” box to diagnose five-mode systems.