Minimum Oil Pressure
*
Engine Model
At Idle Speed:
psi (kPa)
At Rated RPM:
psi (kPa)
Detroit Diesel
14 (97)
55 (350)
Mercedes-Benz
7 (50)
36 (250)
*
Oil pressures are given with the engine at operating temperature. With
the engine cold, oil pressure may be higher. Individual engines may vary
from the listed pressures; observe and record pressures when the engine
is new to create a guide for checking engine condition.
Table 3.1, Minimum Oil Pressure
Maximum Coolant Temperature
Engine Make
Temperature: °F (°C)
Caterpillar
230 (110)
Cummins
225 (107)
Detroit Diesel
215 (101)
Mercedes-Benz
222 (105)
Table 3.2, Maximum Coolant Temperature
Warning and Indicator Lights
There can be up to 28 warning and indicator lamps
installed in the dash message center. See
Fig. 3.7
for pre-EPA07 engines,
Fig. 3.8
for EPA07 engines,
or
Fig. 3.9
for EPA10 engines.
The lamps, or telltales, in the top row are optional.
The lamps on the other three rows are installed at
fixed positions that do not vary. If an optional lamp is
not requested, the position is blank.
See
Table 3.3
for a list of standard and commonly
used warning and indicator lamps.
Engine Protection System
If a critical engine condition exists (for example, low
engine oil pressure, low coolant level, high coolant
temperature, high diesel particulate filter soot level,
or uncontrolled regeneration), the CHECK engine
lamp will illuminate to alert the driver to correct the
condition as soon as possible. If the condition wors-
ens, the STOP engine lamp will illuminate.
NOTE: If the CHECK engine lamp illuminates
during vehicle operation, take the vehicle di-
rectly to an authorized Freightliner service facil-
ity.
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.
The STOP engine lamp illuminates when the engine
protection system is activated. The engine protection
system typically works as follows, depending on the
engine type. Some vehicles may have a shutdown-
override switch, which may be used to momentarily
override the shutdown sequence. See
Chapter 7
for
more information.
•
On some engines, the engine protection sys-
tem will derate the engine, allowing it to run at
lower rpm and slower vehicle speed—drive the
vehicle to a safe location or to a service facility.
•
On other engines, the engine protection sys-
tem will shut down the engine. It will first der-
ate the engine, then shut it down completely
30 to 60 seconds after the indicator illuminates
(depending on the critical fault type) if the con-
dition does not improve.
Bring the vehicle to a stop on the side of the
road before the engine shuts down. Do not at-
tempt to restart the engine while the vehicle is
moving. To restart the engine, turn the ignition
switch to OFF, leave it there a few seconds,
then turn the switch to START. The engine will
run for a short period and shut down again if
the condition does not improve.
Instruments
3.5