What should the Fast Idle Switch be set to during the pre-trip check?

During the pre-trip check, the Fast Idle Switch should be set to the "Off" position. The purpose of this setting is to ensure that the bus undergoes a thorough and accurate pre-trip inspection without engaging the fast idle feature, which increases engine RPMs. This allows the operator to check various components and systems of the bus at normal operating conditions, as they would function during regular service.

Having the Fast Idle Switch set to "On" or "Automatic" might interfere with the function of the vehicle, potentially masking issues that need to be identified during the inspection. Setting it to "Idle mode" could lead to unnecessary idling, which is not conducive to the detailed functionality checks needed during the pre-trip process. Overall, turning the switch "Off" ensures the inspection is conducted under standard operating conditions, promoting safety and proper vehicle functioning during service.