•
audible alert sounds until sufficient air pressure
builds up in the primary and secondary air sys-
tems
•
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 2.1
, or take the vehicle to an authorized
Daimler Trucks service facility as soon as pos-
sible.
NOTE: If active faults are present, take the ve-
hicle to an authorized Daimler Trucks 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 park-
ing 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.
Warning and Indicator Lights
The ICU lightbar has three or four rows of warning
and indicator lights with icon symbols, depending on
the ICU. The positions of the lights may vary for the
different ICU’s, but the telltales are standard for all
applications. See
Table 2.1
for a listing of standard
and commonly used warning and indicator lamps.
Warning and indicator lamps illuminate in red (dan-
ger), amber (caution), green (status advisory), or
blue (high-beam headlights active).
IMPORTANT: Depending upon local jurisdic-
tional emissions guidelines, vehicles may not be
equipped with all of the lamps shown in
Table 2.1
.
Engine Protection System
WARNING
When the red STOP engine lamp illuminates,
most engines are programmed to shut down au-
tomatically within 30 seconds. The driver must
immediately move the vehicle to a safe location
at the side of the road to prevent causing a haz-
ardous situation that could cause bodily injury,
property damage, or severe damage to the en-
gine.
See
Fig. 2.3
for an explanation of the aftertreatment
system (ATS) warning indicators, and actions re-
quired to avoid further engine protection steps.
f600991
09/27/95
1
2
3
4
1.
Main Dash Panel
2.
Lightbar
3.
Driver Message Center
4.
Warning and Indicator Lights
Fig. 2.2, ICU2M Instrument Cluster
Instruments and Controls Identification
2.2
