Diagnostic Check Condition

This module is responsible for determining when to run certain diagnostic checks. The checks this module controls are divided into three groups:

• Group 1 - This group runs only when the ignition is ON, but the engine is not running.

• Group 2 - This group runs only when the engine is running in a steady state (determined by the rate of change of manifold absolute pressure and throttle position).

• Group 3 - This group runs periodically whenever the engine is running.