Perform DFI on-board diagnostics using the electronic climate control panel to access codes and diagnostics.

Learn how to display and interpret trouble codes, distinguish hard and soft codes, and clear trouble codes from memory.

Use engine data display, status lights and switch tests to diagnose driveability problems and diagnostic trouble codes.

Use output cycling tests to diagnose controlled components, such as ISC motors, air switch, diverter and EGR solenoids.

Discover the “fixed spark” test and “cylinder select” mode for modulated displacement engines.