I just found an interesting piece of information on Cummins Engine Warm up protection:
"Engine Warm-up Protection - This feature inhibits the throttle to keep the engine at low idle for a brief period after the engine starts to allow oil to reach all critical areas until engine components before speed is increased above low idle.
To limit the engine's speed at start-up, the following inputs are limited:
1. Throttle input
2. Intermediate-speed control switches
3. Datalink control inputs.
NOTE: The maintenance lamp is turned on while this feature is operating. Once adequate oil pressure is attained, the lamp is turned off.
The engine warm-up protection feature can be enabled or disable with the INSITE™ electronic service tool."
