Instruments And Controls Identification; Instrumentation Control Units - freightliner CENTURY CLASS S Driver Manual

Instruments and Controls Identification

Instrumentation Control Units

The instrumentation control unit (ICU) provides the
driver with engine and vehicle information. It is com-
prised of standard and optional gauges, an audible
warning, a driver message center, and a lightbar con-
taining warning and indicator lamps (also known as
telltales). Warning and indicator lamps illuminate in
red (danger), amber (caution), green (status advi-
sory), or blue (high-beam headlights activated).
Century Class vehicles are equipped with either an
ICU4M (Fig. 2.1) or ICU2M
The following headings in this chapter provide addi-
tional information and operating instructions for ICU
components:
•
"Warning and Indicator Lights"
•
"Driver Message Center"
•
"Instruments"
40
PSI
0 100
OIL
1
200
F
100 300
OIL
3
40
PSI
0 80
TURBO
5
09/29/2010
1. Engine Oil Pressure Gauge
2. Engine Coolant Temperature Gauge
3. Engine Oil Temperature Gauge
4. Battery Voltage Gauge
5. Turbo Boost Air Pressure Gauge
6. Pyrometer
7. Dash Message Center
8. Warning and Indicator Lights
2.1
(Fig. 2.2).
8
OPT OPT OPT OPT
150 200
CHECK STOP
F
100 250
WATER
2
15
12
10
RPM
X 100
8
16
VOLTS
5
4
0
90
F
10
9
30
150
PYRO
6
Fig. 2.1, ICU4M Instrument Cluster
Ignition Sequence
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
8
7
OPT OPT OPT
FASTEN SEATBELTS
ABS ABS
0000432 MILES
!
BRAKE
45
35 55
20
65
25 70
90
50
110
30
75
25 15
130
10
5 85
30
MPH km/h
10
9. Tachometer
10. Speedometer
11. Primary Air Pressure Gauge
12. Secondary Air Pressure Gauge
13. Fuel Level Gauge
14. Transmission Fluid Temperature Gauge
15. Forward Drive Axle Temperature Gauge
16. Rearmost Drive Axle Temperature Gauge
OPT
60 100 60 100
OPT
IDLE
PSI PSI
P S
0 160 0 160
AIR
AIR
11 12
1/2
190 270
F
110
E F 350
FUEL TRANS
13
14
200 200
F F
100 100
300 300
AXLE AXLE
15
16
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