TSB210266-121020

12/13/21, 3:10 PM
Fault Code 7327 Closed Crankcase Ventilation (CCV) Breather Troubleshooting
Technical Service Bulletin
Technical Service Bulletin: TSB210266
Released Date: 10-Dec-2021
Fault Code 7327 Closed Crankcase Ventilation (CCV) Breather Troubleshooting
Fault Code 7327 Closed Crankcase Ventilation
(CCV) Breather Troubleshooting
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
ISX12N CM2380 X120B
Issue Summary
Closed crankcase ventilation (CCV) breather assembly lower bearing corrosion, damage, and/or
debris not allowing the CCV motor to achieve functional speed.
Symptom:
Fault Code 7327: Engine Crankcase Breather Oil Separator Speed - Data Valid But Below
Normal Operating Range - Moderately Severe Level
Root Cause:
CCV housing lower bearing corrosion, damage, and/or debris
Verification
Verify Fault Code 7327 is present.
Standard Fault Code 7327 troubleshooting has been completed with no trouble found.
Before final step of replacing CCV motor, visually inspect CCV housing lower bearing for
corrosion, damage, and/or debris. See Figures 1 and 2 below.
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Fault Code 7327 Closed Crankcase Ventilation (CCV) Breather Troubleshooting
Figure 1, CCV Housing Lower Bearing Face Moderate Corrosion and Heavy Debris (Top View).
Figure 2, CCV Housing Lower Bearing Face Heavy Corrosion and Light Debris (Top View).
Resolution
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12/13/21, 3:10 PM
Fault Code 7327 Closed Crankcase Ventilation (CCV) Breather Troubleshooting
If visual inspection shows lower bearing corrosion and/or debris, replace crankcase breather, Part
Number 5581583. See ISX12N CM2380 X120B Service Manual, Bulletin Number 5504152. Refer
to Procedure 003-001 in Section 3 (/qs3/pubsys2/xml/en/procedures/525/525-003-001.html).
Document History
Date
2021-12-6
Details
Module Created
Last Modified: 10-Dec-2021
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