When the Circuit Actuation Test Mode option is selected on the scan tool, you will have access to Actuator Test menus. The tests listed in the menu provide the capability to activate certain controlled output circuits to the PCM. The lists of tests available vary depending on engine and vehicle equipment. The tests may be used to find device faults that the PCM may not recognize.
During Actuator Tests, both electrical and mechanical activity can be checked and verified. Once a certain device is selected, the PCM activates the device that allows you to listen for an audible click or observe a visual indication of correct device operation.
The scan tool Actuator Test Mode can be used to diagnose many PCM controlled devices, and to help diagnose the cause of one or more trouble codes on these vehicles.