POWER TRAIN 2250 SERVICE/MAINTENANCE MANUAL
7-4
Published 07-19-16, Control # 249-01
ENGINE DIAGNOSTICS
General
The Cummins QSX15 engine has the following two types of
fault codes:
• Engine electronic fuel system fault codes
• Engine protection system fault codes
All fault codes are either active or inactive. Active fault codes
can be read with the red Engine Stop light and the yellow
Engine Warning light on the front console. Inactive faults can
only be read with the electronic service tool supplied by the
engine manufacturer.
Diagnostic Lights
See Figure 7-2 for the following.
The engine diagnostic lights are mounted on the front con-
sole in the operator’s cab.
Engine Stop Light
When illuminated, the red Engine Stop light (1) indicates the
need to stop the engine as soon and safely as possible and
correct the fault.
Engine Warning Light
When illuminated, the yellow Engine Warning light (2)
indicates that the engine can be run, but the fault should be
corrected as soon as possible.
High Exhaust System Temperature Light
See the Operator Manual for details on the high exhaust
system temperature light (3).
Selective Catalytic Reduction (SCR) Regeneration
Light
See the Operator Manual for details on the selective catalytic
reduction (SCR) regeneration light (4).
Selective Catalytic Reduction (SCR) Regeneration
Inhibited Light
See the Operator Manual for details on the selective catalytic
reduction (SCR) regeneration inhibited light (5).
1
3
4
5
2
Item Description
1 Engine Stop Light
2 Engine Warning Light
3 High Exhaust System Temperature Light
4 Selective Catalytic Reduction (SCR) Regeneration Light
5 Selective Catalytic Reduction (SCR) Regeneration
Inhibited Light
FIGURE 7-2
CAUTION
Engine Damage!
Permanent damage can occur if the engine is run while
the red Engine Stop light is illuminated.
If possible, lower a lifted load and then stop the engine as
soon as possible when the red Engine Stop light
illuminates. Do not run the engine until the fault is
corrected.
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