(25) CHECK ENGINE Light
This amber/yellow light, when illuminated, indicates an
engine "fault" exists. Current engine operation may
proceed, but the machine should be scheduled for
checkout/repair as soon as practical.
(26) FAULT CHECK Switch
This Fault Check switch, when moved to the "ON" (up)
position, may be used to activate the "Quantum" Sys-
tem diagnostic codes. When the system detects a
"fault" and one of the indicator lamps (22, 24, 25)
illuminates as previously described, this switch will
permit determination of the kind of "fault(s)" detected.
DETERMINING "FAULT" CODES
1. To determine an active "Quantum fault", turn the
keyswitch to the "OFF" position and wait until the
engine completely stops.
2. Turn keyswitch to "ON" position (engine NOT
running) and hold the Fault Check switch (26) in
the "ON" position.
3. If there is an active fault:
a. The amber/yellow Check Engine light (25) will
flash once.
b. There will be a 1 -- 2 second pause, and then
the red STOP ENGINE light (22) will flash out
the three digit diagnostic code.
Each digit is indicated with up to five light
flashes for each digit.
There is a short pause between each digit of the
fault code.
c. After all three digits are flashed, the yellow lamp
will flash once, and then the red lamp will repeat
the same fault code sequence as before.
4. The system will continue to flash the same fault
code until the FAULT SCROLL Switch (23) is
activated again.
EXITING THE DIAGNOSTICS MODE
Starting the engine, or turning the keyswitch to the OFF
position, will EXIT the diagnostics fault flash mode.
If active fault codes have been determined as de-
scribed previously, refer to the Cummins Engine Quan-
tum System "Troubleshooting and Repair Manual",
Bulletin No. 3666113, Cummins’ "INSITE" service tool
for Quantum, or contact an Authorized Repair Loca-
tion.
OM3012.3 Operation - Section 3
Instrument Panel and Controls Page 3-21
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