Description:
With the installation of a momentary contact Fast Idle switch, the driver can toggle the switch and the engine will go immediately to a preset RPM value.
The available RPM values are stored as the Fast Idle Engine RPM #1 or Fast Idle Engine RPM #2 parameters. The ranges for these two parameters are listed below. The engine will increase from the programmed Low Idle to the Fast Idle Engine RPM #1 value when the Fast Idle switch is first pressed and released. The second time the Fast Idle switch is pressed and released, the engine will increase to the Fast Idle Engine RPM #2 value. After pressing the Fast Idle switch a third time, the engine will return to low idle, and Fast Idle will be disabled.
The difference between the Fast Idle Engine RPM #1 and #2 parameters is that the #1 parameter can be overridden by the operator, whereas the #2 parameter cannot be overridden beyond the programmed value. To override the Fast Idle Engine RPM #1 parameter, the operator should press the accelerator pedal until the desired rpm is reached, and then depress the Fast Idle Enable switch. This rpm will then be the Fast Idle Engine RPM #1 value as long as the ECM is powered.
Available:
3126E, C7, and C9 medium duty engines
Range:
Advantages:
Setting the Fast Idle Engine RPM can help reduce work cycle time by reducing the time it takes to get the engine up to the preferred RPM.
Recommendations:
This programmable feature is application dependent and should be programmed based on customer specific requirements.