NHTSA ID Number: 10153669
Manufacturer Communication Number: IK1201398
TSB/Document Date: 2019-02-25
Summary
Guide the user through resolving Frequent Regen issues on IC Bus; only models with Cummins
ISB 6.7.
IK1201398 - IC Bus with ISB Frequent Regeneration
Page 1 of 5
Countries:
CANADA, UNITED STATES,
MEXICO
Document
ID:
IK1201398
Availability:
ISIS, Bus ISIS, FleetISIS, IsSIR
Revision:
5
Major System:
ENGINES
Created:
10/19/2017
Current
Language:
English
Last
Modified:
12/10/2018
Other
Languages:
NONE
Author:
Michael
Sokolowski
Viewed:
1556
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15
1
Title : IC Bus with ISB Frequent Regeneration
Applies To : IC Bus ISB
CHANGE LOG
Please refer to the change log text box below for recent changes to this article:
02/02/2018 - Added temp differential test in step 2
01/03/2018 - Due to Cummins software changes, removed ROA test (previously step 2)
11/20/2017 - Added Cummins Insite info in step 2
11/01/2017 - Typo corrected
10/25/2017 - Initial Article Release
DESCRIPTION
This document will guide the user through resolving Frequent Regen issues on IC Bus with ISB 6.7.
SYMPTOM(s)
Diagnostic Trouble Code(s) & Dashboard Indicator Light(s):
DTC/Light
Description
SPN 5397 FMI 31 (FCAP) Cummins 3375
Aftertreatment Diesel Particulate Filter
Regeneration Too Frequent - Condition
Exists
SPN 5319 FMI 31 (FCAP) Cummins 3376
DPF incomplete Regeneration
SPN 3251 FMI 16 (FCAP) Cummins 1921
SN 3251 FMI 0 (FCAP) Cummins 1922
Aftertreatment Diesel Particulate Filter
Differential Pressure - Data Valid But
Above Normal Operating Range Moderately Severe Level
Aftertreatment Diesel Particulate Filter
Differential Pressure - Data Valid But
Above Normal Operating Range - Most
Severe Level
Customer Observations or Concerns:
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IK1201398 - IC Bus with ISB Frequent Regeneration
Page 2 of 5
Frequent Regen
SPECIAL TOOL(s) / SOFTWARE
Tool Description
Tool Number
Comments
Instructions
N/A
Tools Resource Center
SERVICE PARTS INFORMATION
Parts Catalog – Click Here
Kit Description
Part Number
Quantity
Notes
Required
COVER ASSEMBLY
2602202C91
1
DIAGNOSTIC STEP(s)
Possible Causes:
1. Airbox boot seal to the hood compromised. Middle section may appear bent or folded in. The seal position looks off-centered
from the hood.
Enter Warning Here
Enter Caution Here
Step Action
1
Decision
DIAGNOSTIC:
Yes. Go to Step 2.
Is the vehicle experiencing too frequent regens?
No. Article does not apply
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IK1201398 - IC Bus with ISB Frequent Regeneration
Step Action
DIAGNOSTIC:
Use INSITE™ electronic service tool to monitor the compressor intake air
temperature and ambient air temperature sensor values.
Perform a road test with the engine at peak power and a vehicle speed of 48
km/h [30 mph] or greater.
Record the compressor inlet temperature and the ambient air temperature.
Calculate the differential temperature:
Compressor inlet temp - ambient air temperature = differential temperature.
Maximum Differential Temperature = 20°F
2
Page 3 of 5
Decision
Yes.
Replace the cover assembly and retest.
See Figure 1 and 2 below
Is the maximum tempurature differential GREATER than 20F?
No. Go to Step 3.
Step Action
DIAGNOSTIC:
Decision
Yes.
Replace the cover assembly.
With the hood in the fully latched position, inspect the accordion boot seal to
hood.
See Figure 1 and 2
Is a gap present between the seal and hood?
3
No. Return to Fault Code Diagnostics
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IK1201398 - IC Bus with ISB Frequent Regeneration
Page 4 of 5
Figure 1: Gap between Boot seal and Hood
Figure 2: Hood misaligned with respect to Boot seal
WARRANTY INFORMATION
Warranty Claim Coding:
Refer to the Warranty Coding Manual for Group and Noun Codes.
Standard Repair Time(s):
Refer to the SRT Manual for Repair Times
OTHER RESOURCES
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IK1201398 - IC Bus with ISB Frequent Regeneration
Page 5 of 5
Master Service Information Site
Feedback Information
Hide Details
Viewed:
1555
Helpful:
15
Not Helpful: 1
Staff
ID
Client
ID
DY57267
Comments
Created
Date
You received the following feedback From: dy57267 - Michael Jones Email Address: [email protected] Job Classification: AD005,
12/11/2018
General Manager Dealer: LEONARD BUS SALES, INC. Feedback: Please update the change log with what was updated. Revision on 1212:11:20 PM
10-18 but last change was 02-02-18. Thank You
Copyright © 2019 Navistar, Inc.
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TSB/Document ID: IK1201398
Replacement Service Bulletin Number:
MFR Communication Date: 2018-12-10
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ENGINE
MFR Component System:
MFR Component Subsystem:
Previous TSB | Next TSB |
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