General Description, Optimized Idle

p4 dm 03.08.000

Optimized Idle reduces idle time by automatically stopping and restarting the engine. Besides saving fuel, it helps keep the batteries charged while maintaining engine and cab temperature.

The following conditions must be met for the optimized idle to function:

  • Vehicle in neutral gear

  • Parking brake set

  • Hood latched

  • Sleeper fan on

Optimized idle has four unique operating modes: battery, cold startability (engine oil temperature), interior comfort mode, keyless.

  • Battery mode: starts the engine when battery voltage is below a certain threshold.

  • Engine oil temperature mode: starts the engine when the engine oil temperature is below a certain threshold.

  • Comfort mode: starts the engine to maintain the driver's selected interior temperature

  • Keyless mode: maintains any of the modes above without the key in the ignition switch.

Note:
Parent topic: Optimized Idle
Document Number: 0000108788
Manual Publication Date: 2024-05-03
Topic Publication Date: 2025-02-28