TSB210034-042020

Service Bulletin Details

Public Details for: TSB210034-042020

This technical service bulletin describes the verification and resolution of 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. Th


- 9999 -

Models from 9999
9999 CUMMINS L9 
5/2/22, 12:21 PM
Engine Noise During or After Snap Throttle
Technical Service Bulletin
Technical Service Bulletin: TSB210034
Released Date: 20-Apr-2022
Engine Noise During or After Snap Throttle
Engine Noise During or After Snap Throttle
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
Issue
Symptom:
Complaint of engine noise, which is a knock (combustion clatter or pinging), during or after
snap throttle and while returning to idle.
Root Cause:
An audible fuel knock noise 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.
Verification
Verify no other fault codes or symptoms are present.
Verify engine noise complaint during engine acceleration, deceleration, or returning to idle.
Verify the unit does not have previous fuel knock history (do not repeat this procedure).
Resolution
Connect to the ECM with the recommended Cummins® electronic service tool or equivalent.
Cylinder cut out test to determine which cylinder/injectors is malfunctioning, usually one
injector makes an audible difference.
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5/2/22, 12:21 PM
Engine Noise During or After Snap Throttle
Perform an injector reset on the suspect injector 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/583/583-006-026.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. Motoring events are
recommended in the route, as they help the injectors adjust. Allow for cooling time after road
test to verify solution.
Document History
Date
Details
2021-2-11
Module Created
2022-4-19
Updated Symptom, Verification, and Resolution.
Last Modified: 20-Apr-2022
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