TSB210034-021120

3/1/2021
Engine Noise During First 160 km [ 100 miles ] of Engine Operation
Technical Service Bulletin
Technical Service Bulletin: TSB210034
Released Date: 11-Feb-2021
Engine Noise During First 160 km [ 100 miles ] of Engine Operation
Engine Noise During First 160 km [ 100 miles ] of Engine Operation
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
Engine:
L9 CM2450 L126B
Mileage and Kilometer Limitations:
Unit is within first 160 km [ 100 miles ] of life
Issue
Symptom:
Engine with complaint of knock (combustion clatter or pinging) during or after snap throttle and while returning to idle.
Root Cause:
An audible fuel knock noise during the first 160 km [ 100 miles ] is a result of incomplete fueling adaption learning and is not an
indication of a malfunction.
As the vehicle is driven, the engine control module (ECM) will learn the injector characteristics and adjust fueling variables.
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Engine Noise During First 160 km [ 100 miles ] of Engine Operation
Verification
Verify the unit has less than 160 km [100 miles].
Verify engine noise complaint during engine acceleration, deceleration, or returning to idle.
Resolution
Connect to the ECM with the recommended Cummins® electronic service tool or equivalent.
Perform an injector reset using the recommended Cummins® electronic service tool or equivalent. See L9 CM2450 L126B
Service Manual, Bulletin 5613077. Refer to Procedure 006-026 in Section 6 (/qs3/pubsys2/xml/en/procedures/583/583-006026.html).
If noise is still present, perform a diagnostic road test, utilize a route that incorporates both stop and go city type driving and
steady state highway type driving.
Document History
Date
2021-2-11
Details
Module Created
Last Modified: 11-Feb-2021
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