Ignition Sequence

cen dm 02.00.002

When the ignition is turned on, the ICU runs a self-check. Observing the ignition sequence is a good way to ensure the ICU is functioning properly.

Important: Do not crank the engine until the ICU gauge sweep is complete.

Note: Air gauges do not complete a sweep of their dials during the ignition sequence.

When the ignition is turned on, the following actions should occur:

electronic gauges complete a full sweep of their dials
some warning and indicator lamps illuminate, then are extinguished
audible alert sounds until sufficient air pressure builds up in the primary and secondary air systems
software revision level of the ICU is displayed on the driver message center, followed by any active faults

Important: If any red or amber warning or indicator lamps do not illuminate during the ICU self-check or do not extinguish after the self-check completes, take the action outlined in Table., or take the vehicle to an authorized Daimler Truck service facility as soon as possible.

Note: If active faults are present, take the vehicle to an authorized Daimler Truck service facility as soon as possible.

If the ICU receives active fault codes, it displays them one after the other until the parking brake is released or the ignition is turned off. Once the parking brake is completely released, the ICU displays the odometer. If there are no active faults, the ICU displays the odometer after the self-check completes.

When the self-check is complete on an ICU4M, the fasten seat belt screen displays if the engine is off. If the engine is running, the idle hours screen displays.

Audible Alerts

An audible alert sounds during the ignition sequence and whenever one of the following conditions exists:

Engine oil pressure falls below the minimum preset value.
Coolant temperature rises above the maximum preset value.
Air pressure falls below approximately 70 psi (483 kPa).
Parking brake is set with the vehicle moving faster than two miles per hour.
System voltage falls below 12 volts.
Door is open or the headlights are on, with the parking brake off.

Table 1, Common Warning and Indicator Lamps

Common Warning and Indicator Lamps
Lamp Description			Color
	STOP Engine¹	Indicates a serious fault that requires engine shutdown immediately. The engine protection system reduces the maximum engine torque and speed, and, if the condition does not improve, shuts down the engine within 30 to 60 seconds. Safely bring the vehicle to a stop on the side of the road and shut down the engine as soon as the red light is seen. Important: If the engine shuts down while the vehicle is in a hazardous location, turn the key to the OFF position for a few seconds, then restart the engine and move the vehicle to a safer location.	Red
	Low Air Pressure	Indicates air pressure in the primary or secondary reservoir is below 70 psi (483 kPa).
	Parking Brake	Indicates the parking brake is engaged. An audible alert activates when the vehicle is moving over 2 mph (3 km/h) with the parking brake set.
	Low Battery Voltage	Indicates that battery voltage is 11.9 volts or less.
	Unfastened Seat Belt	Activates with an audible alert when the system detects that the parking brake is off and the driver seat belt is not fastened on some vehicles. On other vehicles, this lamp illuminates for 15 seconds when the ignition is first turned on.
	CHECK Engine¹	Indicates an engine condition (low oil pressure, low coolant level, high coolant temperature, high DPF soot level, or uncontrolled DPF regeneration) that requires correction. Correct the condition as soon as possible. If the condition worsens, the STOP engine lamp illuminates.	Amber
	High Exhaust System Temperature (HEST)¹	Slow (10-second) flashing indicates a regeneration (regen) is in progress. IMPORTANT: When the HEST lamp is illuminated, do not park the vehicle near flammable material. Solid illumination indicates high exhaust temperatures at the outlet of the tail pipe when speed is below 5 mph (8 km/h).
	Diesel Particulate Filter (DPF) Status	Solid illumination indicates a regen is required. Change to a more challenging duty cycle (such as highway driving) to raise exhaust temperatures for at least twenty minutes, or perform a parked regen. Blinking indicates that a parked regen is required immediately. An engine derate and shutdown occurs.
	Malfunction Indicator Lamp (MIL)	Indicates an emissions-related fault. See the engine operation manual for details.
	Vehicle ABS	Momentary illumination indicates the vehicle ABS is engaged. Solid illumination indicates a problem with the vehicle ABS. Repair the ABS immediately to ensure full braking capability.	Amber
	Trailer ABS	Momentary illumination indicates the trailer ABS is engaged. Solid illumination indicates a problem with the trailer ABS. Repair the ABS immediately to ensure full braking capability.
	No Charge	Indicates the alternator is not properly powering the electrical system.
	Water in Fuel	Indicates the fuel may contain water. Drain any water collected in the fuel/water separators.
	Fuel Filter Restriction	Indicates the fuel filter is clogged and requires service.
	Check Transmission	Indicates an undesirable transmission condition.
	Transmission Overheat	Indicates high transmission temperature.
	Wheel Spin	Flashing indicates the ATC system is active, or the ATC button has been pressed to allow wheel slip. Solid illumination indicates a problem with the ATC system. Repair the ATC system immediately to ensure full braking capability.
	Engine Brake	Indicates the engine brake is enabled.	Green
	Left-Turn Signal	Flashing indicates the outside left-turn signal lights are activated.
	Right-Turn Signal	Flashing indicates the outside right-turn signal lights are activated.
	High-Beam Headlights	Indicates the high-beam headlights are on.	Blue