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Operation - Section 3
Page 3-20
(21) WARNING DECAL
This decal warns the opera-
tor that the transmission will
upshift automatically in the
event of engine overspeed.
(see discussion for item 20,
Figure 3-6)
Apply brakes to slow
down.
Cummins "Quantum" Engine
Electronic Control System
The following information (items 22 through 26, Figure
3-6) relates to the Cummins "Quantum" Engine Elec-
tronic Control System.
If an abnormal engine condition develops, the control
system will record a "fault" code associated with that
condition. By use of a series of indicator lamps and
switches, the system will display the numerical "fault"
code.
When the keyswitch is turned "On", the lamps (22, 24,
25) should illuminate for about 2 seconds and then turn
"Off", if no "faults" are detected in the system. This is a
system lamp test.
If a light stays ON, or FLASHES, then active "faults"
have been detected by the system and the engine
should not be started until the condition has been
corrected. Refer to DETERMINING "FAULT" CODES.
During engine operation, if a "fault" is detected in the
system, a light associated with that condition will turn
"ON" and stay on for "Warning faults", or it will turn "ON
and FLASH" for more severe faults that can affect
engine operation and require immediate attention.
Instrument Panel and Controls
• "Warning" faults (light ON) are ones that require
attention in the near future, but in most conditions
will not greatly affect performance.
• "Severe" faults (light FLASHING) are ones that
require immediate attention, because the engine
could be significanly affected.
Active fault conditions MUST be corrected as soon
as possible.
(22) STOP ENG. Light
This red Stop Engine light, when illuminated, indicates
a serious engine problem exists. The "fault" can be
engine disabling. Stop the truck in a safe area, as soon
as possible. Shutdown the engine and notify Mainte-
nance immediately.
(23) FAULT SCROLL Switch
This FAULT SCROLL switch, may be used to scroll
through the recorded faults held in memory. It will
display only active fault codes.
To display the next active fault code, move the switch
lever to the "up" position momentarily and release
(switch is spring-loaded to the center, "OFF" position).
Activating the switch again will advance to the next fault
code, etc. Once all active fault codes have been dis-
played, the fault code display sequence will be re-
peated, starting from the first fault code.
Moving the switch lever to the "down" position momen-
tarily and releasing, permits the system to scoll (as
described above) backwards through the fault "list".
(24) PROT. ENG. Light
This white Engine Protection light, when illuminated,
indicates an "out-of-range" condition exists within the
fuel temperature, coolant, oil, or intake air system(s) of
the engine.
The light may show initially as a constant "On", but will
go to "flashing On", if the condition is allowed to get
worse. Serious engine damage will occur if operation
is continued without correcting the "fault".
OM3012.3
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