cause to prevent further damage. Do not operate
the engine until the cause has been determined
and corrected.
During normal engine operation, the coolant tem-
perature gauge should read 175 to 195°F (79 to
91°C). See
Fig. 3.11. If the temperature remains
below 160°F (71°C), or exceeds the maximum tem-
perature shown in
Table 3.2, inspect the cooling sys-
tem to determine the cause. See Group 20 of the S2
Chassis Workshop Manual.
The coolant temperature gauge is mission-critical. If
the coolant temperature rises above the preset levels
shown in
Table 3.2, first the check engine light will
illuminate, and, if the condition does not improve, the
stop engine light will also illuminate and the buzzer
will sound. At this point, the engine will derate or shut
down, depending on the type of engine protection
system installed.
Fuel/Diesel Exhaust Fluid (DEF)
Gauge
For engines that are EPA10-compliant or newer, the
fuel and DEF levels are measured in a dual purpose
fuel/DEF gauge. See
Fig. 3.12.
The diesel fuel level is indicated at the top of the
gauge, with a low-level warning lamp that illuminates
when the diesel fuel level registers 1/8th of capacity.
One fuel gauge is standard. If equipped with a sec-
ond (optional) fuel gauge, each fuel tank level is indi-
cated on a separate gauge.
The DEF level is indicated in the lower portion of the
gauge. There is a low DEF level warning lamp that
illuminates when the DEF level reaches 10% of ca-
pacity. See
Chapter 9 for details of the DEF gauge
functions.
Figure 3.13 shows a fuel gauge installed on EPA07
vehicles.
Primary and Secondary Air Pressure
Gauges
WARNING
If air pressure falls below minimum pressure, the
braking ability of the vehicle will be limited. Slow
10/09/2001
0
100
50
PSI
OIL
f610528
Fig. 3.10, Engine Oil Pressure Gauge
10/09/2001
f610565
WATER
100
150
200
250
F°
Fig. 3.11, Coolant Temperature Gauge
08/21/2009
1/2
ULTRA LOW SULFUR
DIESEL FUEL ONLY
EF
DEF
FE
f611045
1
2
3
4
1. Diesel Fuel Level Indicator
2. DEF Level Indicator
3. Low DEF Warning Lamp (amber below 10% DEF)
4. Low Fuel Warning Lamp (amber at 1/8 tank of fuel)
Fig. 3.12, Fuel/DEF Gauge, EPA10
Instruments
3.10
To Next Page
Loading...
