Activating Optimized Idle

57x d 11.02.001

The vehicle must be in neutral gear, the hood latched, and the park brake set for optimized idle to work. Failure to meet these conditions will result in a checklist pop-up screen showing both the met and unmet conditions. See Fig..

Fig. 1, Optimized Idle Activation Conditions Pop-Up

Dismiss the pop-up screen, fix the issue(s), and restart optimized idle.

Note:  Turning the sleeper HVAC fan off will turn off the interior comfort mode until the fan is turned back on.

  1. Set the parking brake.
  2. If open, close and secure the hood.
  3. Allow the engine to idle if it is running. If the engine is not running, turn the key to the ON position.
  4. Put the transmission in neutral.
  5. Navigate to the optimized idle screen on the driver display. See Fig..

    Fig. 2, Optimized Idle Start Screen

  6. Press OK on the steering wheel switch pod to view the mode option screen. See Fig..
  7. Select OK to enable optimized idle, and, if desired, turn on the interior comfort mode (sleeper cabs only). The current optimized idle state is displayed. See Fig..
    When optimized idle is active, the optimized idle telltale illuminates at the bottom of the driver display. See Fig..
    If optimized idle fails to start, see the driver display for information.

    Fig. 3,  Optimized Idle Mode Selection Screen

    Fig. 4, Optimized Idle State Screen

    Fig. 5, Optimized Idle Telltale

  8. If the interior comfort mode is activated (sleeper cabs only), set the desired temperature and fan speed on the sleeper HVAC controls.
    The allowable temperature range for optimized idle operation is 65 to 80°F (18 to 27°C).
    Optimized idle will operate the engine, starting and turning it off as needed to maintain battery charge, engine oil temperature, and cab/sleeper temperature.
Note:
Parent topic: Optimized Idle®
Document Number: 0000107369
Manual Publication Date: 2024-09-03
Topic Publication Date: 2025-04-05