NHTSA ID Number: 11007053
Manufacturer Communication Number: TSB220232
TSB/Document Date: 2024-09-05
Summary
This Technical Service Bulletin describes the recalibration steps for the software logic and calibration values of the Load Based Speed Control feature within the engine control module calibration which may interact with OEM Load Based Speed Control in an unintended manner, resulting in low power. This is an update to a previously submitted communication.
9/3/24, 4:22 PM
Load Based Speed Control Overriding the OEM Load Based Speed Control, Causing Limitations in Engine Speed and Producing an …
Technical Service Bulletin
Technical Service Bulletin: TSB220232
Released Date: 20-Aug-2024
Load Based Speed Control Overriding the OEM Load Based Speed Control, Causing
Limitations in Engine Speed and Producing an Undesired Output as a Result
Load Based Speed Control Overriding the OEM Load
Based Speed Control, Causing Limitations in Engine
Speed and Producing an Undesired Output as a
Result
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
Engines:
X15
CM2450 X124B
X15 CM2450 X134B
X15 CM2450 X142B
Original Equipment Manufacturer:
Navistar® International® truck
Issue Summary
Symptom:
Low Power
Root Cause:
OEM Load Based Speed Control is password protected.
When OEM Load Based Speed Control is enabled, the engine will not use the RPM Breakpoint
of Load Based Speed Control if it is higher than the RPM Breakpoint of OEM Load Based
Speed Control.
If ECM calibration was recently updated:
https://quickserve.cummins.com/qs3/pubsys2/xml/en/tsb/2022/tsb220232.html
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9/3/24, 4:22 PM
Load Based Speed Control Overriding the OEM Load Based Speed Control, Causing Limitations in Engine Speed and Producing an …
New Load Based Speed Control strategy change in the ECM calibration allows Load
Based Speed Control breaking point value to override OEM Load Based Speed Control
breakpoint value even when Load Based Speed Control is shown as disabled. Logic will
always consider the lowest value between both Load Based Speed Control and OEM
Load Based Speed Control when OEM Load Based Speed Control is enabled causing a
limitation in engine speed.
Verification
Verify unable to meet Load Based Speed Control RPM Breakpoint.
Use the recommended Cummins® electronic service tool or equivalent to verify OEM Load
Based Speed Control is enabled.
If ECM calibration was recently updated, verify:
Units with manual transmission powered by an X15 engine.
Load Based Speed Control is disabled.
Engine Speed is being limited at Load Based Speed Control breaking point RPM value.
Resolution
Use the recommended Cummins® electronic service tool or equivalent to find the current
ECM code and revision number in the ECM.
Compare the ECM code and revision number in the ECM to the calibration revision listed in
the ECM calibration revision history for applicable changes. If a calibration update for this
issue is available, the ECM calibration revision must be that revision or higher.
If ECM calibration is or was recently updated:
Verify that Load Based Speed Control RPM Breakpoint matches the RPM Breakpoint of
OEM Load Based Speed Control (See Figure 1). Both must have same Breakpoint value.
If Load Based Speed Control is disabled, Load Based Speed Control must be
enabled to view or edit RPM Breakpoint. This is the only value to edit since OEM
Load Based Speed Control is OEM password protected.
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9/3/24, 4:22 PM
Load Based Speed Control Overriding the OEM Load Based Speed Control, Causing Limitations in Engine Speed and Producing an …
Figure 1, Load Based Speed Control and OEM Load Based Speed Control Parameters.
Complete the changes and road test unit to verify Engine Speed is no longer limited by Load
Based Speed Control.
Document History
Date
Details
2022-11-14
Module Created
2023-11-13
Updated Title, Issue Summary, Verification, Resolution, and added
Figure 1.
2024-8-7
Updated entire document.
Last Modified: 20-Aug-2024
https://quickserve.cummins.com/qs3/pubsys2/xml/en/tsb/2022/tsb220232.html
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TSB/Document ID: TSB220232
Replacement Service Bulletin Number:
MFR Communication Date: 2024-08-21
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ENGINE
MFR Component System:
MFR Component Subsystem:
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