Instrumentation Control Units - freightliner Columbia 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).
Columbia vehicles are equipped with either an ICU3
(Fig. 2.1), ICU4 (Fig. 2.2), or ICU4M
The following headings in this chapter provide addi-
tional information and operating instructions for ICU
components:
•
"Warning and Indicator Lights"
•
"Driver Message Center"
1
50
PSI
0 100
OIL
200
150
F°
100 250
WATER
225
12
F°
100 350
TRANS
10/26/2006
1. Engine Oil Pressure Gauge
2. Dash Message Center
3. Headlight High-Beam Indicator
4. Dash Message Center
5. Fuel Level Gauge
2.1
(Fig. 2.3).
2
OPT OPT OPT OPT
CHECK STOP
20
25
15
10
5
RPM
0
X100
11
6. Primary Air Pressure Gauge
7. Mode/Reset Switch
8. Secondary Air Pressure Gauge
9. Speedometer
Fig. 2.1, ICU3 Instrument Cluster
•
"Instruments"
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
3 4
OPT OPT OPT
ABS
BRAKE
45
35
70
30
90
25
50
30
15
10
5
km/h
MPH
10
OPT OPT
1/2
ABS
E
FUEL
50
100
55
PSI
65
150
0
AIR
110
75
130
50 100
85
PSI
150
0
AIR
9
10. Tachometer
11. Tranismission Fluid Temperature
Gauge
12. Coolant Temperature Gauge
5
F
6
7
PUSH−
MODE
HOLD−
RESET
8
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