Skip to content Skip to sidebar Skip to footer

√ Adjustable Low Idle Speed on Cummins INSITE Software (CUMMINS Engines)

Adjustable Low Idle Speed

Trip Information on Cummins INSITE Software (CUMMINS Engines)


This feature can reduce the amount of fuel burned and decrease cab noise and vibration. The low idle speed can be set to the desired value using INSITE™, however the operator can override this value using an OEM-supplied idle speed adjustment switch.

Low idle speed is controlled by the low idle governor which prevents the engine speed from dropping below a predetermined value by controlling engine fueling. The default low idle speed is defined by the calibration.
Figure 1.2 - Low Idle Speed/ 750 RPM (Murphy PowerView)

The low idle speed adjustment switch enables the driver to adjust the low idle speed using a two-position momentary toggle switch. Pressing and releasing the switch in one direction raises the low idle speed by a calibrated increment, such as 25 RPM, and pressing and releasing the switch in the other direction lowers the idle speed by the same calibrated increment. When the switch is held in either adjust position, the idle speed gradually increases or decreases by the calibrated increment.

#Features and Parameters
Figure 1.3 - Low Idle Speed Additional Settings

1). Adjustable Low Idle Speed
When enabled, this feature allows the user to configure Low Idle Speed.
2). Low Idle Speed
This allows the user to set the engine idle speed that will be maintained when the accelerator pedal or lever is released.
-Changing Setting Low Idle Speed with INSITE:
A. Double click on the "ECM Value" to change, and use the keyboard to edit the current value (750 RPM).
B. Click the "Send to ECM" button on the toolbar or select "Send to ECM" on the right click menu.
Figure 1.4 - Send to ECM
C. Click "OK" on "Confirm ECM Adjustment" window to continue.
Figure 1.5 - Confirm ECM Adjustment
D. "Key Switch" window displays: Please turn the Key Switch off, and then click OK.
Figure 1.4 - Key Switch (1)
E. "Key Switch" window displays - Action: Waiting 30 seconds before allowing for Key On.
Figure 1.5 - Key Switch (2)
F. "Turn Key Switch On" window displays: Please turn the Key Switch on, then click OK.
Figure 1.6 - Turn Key Switch On
G. "ECM Write Succeeded" window displays: All parameters were written successfully to the ECM. Click "OK" (will displays as Figure 1.1 above).
Figure 1.7 - ECM Write Succeeded

3). Low Idle Speed Additional Settings
When enabled, the following additional settings are available.
4). Step Size
This parameter is used to set an incremental change in acceleration or deceleration.
The operator can adjust the idle speed in 25 RPM increments if an OEM-supplied idle adjustment switch is installed.

#Interaction with other Features and Parameters:
A Low Idle Adjustment Switch monitor parameter is provided to help diagnosis issues related to the low idle adjustment switch. The monitor has three states:
  • Increment — The low idle engine speed is increasing.
  • Decrement — The low idle engine speed is decreasing.
  • Center Off — The low idle adjustment switch is in the normal or center position.
When increasing the low idle engine speed, the Low Idle Adjustment Switch parameter will indicate Increment. When decreasing the low idle engine speed, Low Idle Adjustment Switch parameter will indicate Decrement. When the low idle adjustment switch is in the normal or center position, the Low Idle Adjustment Switch parameter will indicate Center Off.

Note: Incorrect adjustment of the low idle speed may cause excessive vehicle vibration or slightly decreased fuel economy.



.