TSB220192-092920

Premature Battery Power loss: Fault Code 1117
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Technical Service Bulletin
Technical Service Bulletin:
Released Date: 29-Sep-2022
TSB220192
Premature Battery Power loss: Fault Code 1117
Premature Battery Power loss: Fault Code
1117
Warranty Statement
The information in this document has no effect on present warranty coverage or repair
practices, nor does it authorize TRP or Campaign actions.
Contents
Product Affected
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B6.7 CM2350 B121B
B6.7 CM2450 B155B
ISX12 CM2350 X102
L9 CM2350 L116B, L9 CM2350 L123B
L9 CM2450 L126B
L9N CM2380 L142B
X12 CM2350 X119B
X12 CM2450 X137B
X15 CM2350 X114B
X15 CM2350 X116B
X15 CM2450 X124B
X15 CM2450 X134B
Issue Summary
Symptom:
• Fault Code 1117
◦ Fault Code 1117 detects when the ECM did not have enough time to finish
writing data before losing power. FC1117 will immediately go inactive at a
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normal engine start up. FC1117 can have multiple counts of the code if the
engine is continually losing power prematurely.
Root Cause:
• ECM power supply loss
• ECM power ground Loss
• Key Switch voltage drop
Verification
• ECM Power Ground Loss: Cummins Inc. prefers the ECM power ground is 4 or 5
wires that will be one the OEM J2 ground for the ECM to be grounded to the
cylinder block. The cylinder block ground stud should be an M10 threaded stud on
the cylinder block usually below or near the ECM and then from the cylinder block
directly to the battery negative post.
Note : Some applications may have an ECM case ground strap. This grounds
only the housing of the ECM and does not ground internal connections. This
is not a connection that would lead to Fault Code 1117.
Figure 1, Grounding Strap.
1. ECM Power Supply Loss: The ECM power supply (See Figure 5) is the 4 or 5 wires
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that will be on the OEM J2 power for the engine control module (ECM).
Figure 2, Example Power Distribution Module.
• Loose ECM ground connections will cause intermittent ECM power ground loss.
The ECM ground connection is located on the cylinder block as a threaded stud
below or near the ECM.
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Figure 3, Example Grounding Wire Location.
Figure 3 Items:
1.
2.
3.
4.
5.
Fuel pump rear bracket.
OEM installed bracket.
Ground cable, stud, and nut.
Power steering pump.
Lubricating oil pan.
• Ground noise issues can cause ECM power ground loss if Cummins Inc. grounding
best practices are not followed.
2. ECM Power Supply Loss: The ECM power supply (See Figure 5) is the 4 or 5 wires
that will be on the OEM J2 power for the engine control module (ECM).
• a.Using an OEM Disconnect switch, sometimes referred to as a kill switch, E-Stop,
etc., and/or not letting the ECM power down appropriately can cause a Fault Code
1117 indicating a premature power supply loss
◦ The ECM continues to write data and work after engine key off and needs
uninterrupted power for a set time to finish.
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Figure 4, Example Kill Switch.
• Using a Power Distribution Module (PDM) can cause a premature power supply
loss. Depending on application this may or may not be present. If present, A PDM is
a module that can be used to control power on and off to a subset of the equipment
or the whole engine.
• If the ECM Power wiring is connected through the starter to the battery a power
supply loss could be detected by the ECM.
Note : CMI requires ECM power connected straight to battery from the ECM
positive terminals on J2.
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Figure 5, Example OEM wiring Schematic.
3. Key Switch Voltage Drop
• Old or weak batteries weak batteries can cause a voltage drop at engine cranking
events.
◦ Indicators of a weak battery: long crank or hard start up; despite engine
starting the voltage drop could cause Fault Code 1117.
• Loss of key switch signal or connection could cause voltage drops. Verify key switch
hardware and or wiring is not loose. For the purpose of troubleshooting Fault Code
1117, the key switch of concern is the input signal from the OEM’s physical key
switch to the ECM J2 connector.
• Key switch signal should be uninterrupted without relays. Interruptions of the input
signal could induce Fault Code 1117.
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Figure 6, Key Switch Signal Example.
Resolution
• If any connections are found to be incorrectly routed or in need of repair, contact
OEM.
• For any malfunctions that are not covered under Cummins Inc. warranty, repair
locations are to contact OEM for further repair direction.
Document History
Date
2022-9-13
Details
Module Created
Last Modified: 29-Sep-2022
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