Fuel/Diesel Exhaust Fluid (DEF)
Gauge
The fuel and DEF levels can be measured in a dual
purpose fuel/DEF level gauge. See
Fig. 3.41.
The diesel fuel and DEF levels are indicated on the
gauge. A low fuel warning lamp illuminates amber
when the diesel fuel level registers 1/8th of capacity.
The low DEF warning lamp illuminates amber when
the DEF level reaches 10% of capacity. See
Chap-
ter 14
Emissions and Fuel Efficiency for details of
the DEF gauge functions.
Primary and Secondary Air Pressure
Gauges
WARNING
If air pressure falls below minimum pressure, the
braking ability of the vehicle will be limited. Slow
the vehicle down and bring it to a gradual stop.
Do not attempt to move the vehicle until air pres-
sure has risen above the minimum level. Moving
a vehicle without adequate braking power could
cause an accident resulting in property damage,
personal injury, or death.
Air pressure gauges register the pressure in the pri-
mary and secondary air systems. See
Fig. 3.42. Nor-
mal pressure, with the engine running, is 100 to 120
psi (689 to 827 kPa) in both systems.
NOTE: The low-air warning buzzer only works
when the park brake is released. The low-air
warning buzzer is silenced when the park brake
is set.
If air pressure drops below approximately 70 psi (483
kPa), a warning light illuminates and the driver dis-
play shows a warning. A low-air warning buzzer also
sounds if the park brake is not set.
NOTE: If the pressure in both air systems drops
below 70 psi, the parking brakes will drag or
apply.
Speedometer
Two physical speedometer options are available. The
U.S. version of the speedometer (
Fig. 3.43) registers
speed in both miles per hour (mph) and kilometers
per hour (km/h), with mph in larger numbers. The
metric version of the speedometer face reverses this
arrangement, with km/h in larger numbers.
f61140906/28/2016
1
2
43
1. Fuel Gauge Pointer
2. DEF Gauge Pointer
3. Low Fuel Warning
Lamp
4. Low DEF Warning
Lamp
Fig. 3.41, Fuel/DEF Gauge
f61177908/16/2019
Fig. 3.42, Analog Combined Application Air Pressure
Gauge - ICUC
Instruments
3.23
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