IK1201178 ­ SPN 5397 FMI 31 Aftertreatment DPF Regeneration Too Frequent Diagnost... Page 1 of 3

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Title : SPN 5397 FMI 31 Aftertreatment DPF Regeneration Too Frequent Diagnostics
Applies To : EPA 2014 N9 and N10 SCR ESN 3540000 +
CHANGE LOG
NOTE: DO NOT delete this Change Log.
Dealers: Please refer to the change log text box below for recent changes to this article:
8/08/2014 - Initial Article Release 10/08/2014 ­ Add CAC Decay Test requirements to steps 10/24/2014 ­ Added new step 1 for calibration update.



DESCRIPTION
The purpose of this article is to provide diagnostic steps for N9/N10 SPN 5397 FMI 31 (DPF Regenerations occurring to
frequently) fault.
MIL will illuminate after this fault is detected during two subsequent drive cycles.
SYMPTOM(s)
Diagnostic Trouble Code(s) & Dashboard Indicator Light(s):
SPN

FMI Descriptions

5397

31

DPF regenerations occuring too frequently

Customer Complaint(s):
• Frequent regens
• Aftertreatment lights/MIL
SPECIAL TOOL(s) or SOFTWARE
Tool Description
EZTech
ServiceMaxx
Tool Description

Tool Number

Charge Air Cooler Test Kit

ZTSE­4341

DIAGNOSTIC STEP(s)
Step Action
Does dealer scorecard reflect calibration up to date?

Decision
Yes: Go to step 4

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IK1201178 ­ SPN 5397 FMI 31 Aftertreatment DPF Regeneration Too Frequent Diagnost... Page 2 of 3

1

Using Electronic Service Tool (EST) with ServiceMaxx software.
check if the last four characters in the calibration MDR3?

Step Action

2

Decision

Using Electronic Service Tool (EST) with ServiceMaxx software,
check for fault codes.

Yes: Go to step 5

Is SPN 5397 FMI 31 the only fault code present?

No: Go to step 3

Step Action

3

No: Update calibration via NETs and
ensure the last four characters change
to MDR3.

Decision

Using Electronic Service Tool (EST) with ServiceMaxx software,
check Diagnostic Trouble Code (DTC) list for SPN 132 FMI 11,
13 and 14 (MAF calibration needed/failed).

Yes: Repair SPN 132 FMI 11, 13 and
14 (refer to diagnostic manual and
IK1200526. After repairs are complete,
retest for SPN 5397 FMI 31.

Are SPN 132 FMI 11, 13 and 14 fault codes present?
No: Go to step 4
Step Action

4

Decision

Using Electronic Service Tool (EST) with
ServiceMaxx software, check Diagnostic
Yes: Go to step 5
Trouble Code (DTC) list for SPN 3251 FMI 2,
3 and 4 (DPFDP/outlet pressure).
Is EST DTC list free of SPN 3251 FMI 2, 3
and 4?

No: Repair SPN 3251 FMI 2, 3 and 4. After repairs are
complete, retest for SPN 5397 FMI 31.

Step Action

5

Using terminal test kit, inspect connections at Diesel Particulate Yes: Go to step 6
Filter Differential Pressure (DPFDP) sensor. With key OFF,
disconnect DPFDP sensor. Check DPFDP sensor and connector
terminals for: damaged or pinched wires; corroded terminals,
No: Repair connector, harness, or
loose, bent or broken pins; or broken connector housing.
terminal damage. After repairs are
Are the DPFDP sensor connector, harness, and terminals clean complete, retest for SPN 5397 FMI 31
and undamaged?

Step Action

6

Decision

Check DPFDP sensor hoses for correct routing and restrictions.
Inspect the DPFDP sensor hoses for kinks, improper hose
routing, restriction or damage.
Are the DPFDP sensor hoses routed correctly, free of damage,
and unrestricted?

Step Action
Check air management system for boost leaks:
7
A.
Inspect air intake system from air filter to engine intake manifold
for air leaks, damage, or restrictions.
B. Pressurize the Charge Are Cooler (CAC) system to 30 psi
using Charge Air Cooler (CAC)Tester ZTSE4341. If pressure

Decision
Yes: Go to step 7
No: Repair or replace DPFDP sensor
hose(s). After repairs are complete,
retest for SPN 5397 FMI 31.

Decision
Yes: Go to step 8
No: Repair air intake restrictions, leaks
or physical damage. After repairs are
complete retest for SPN 5397 FMI 31.

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IK1201178 ­ SPN 5397 FMI 31 Aftertreatment DPF Regeneration Too Frequent Diagnost... Page 3 of 3

decay exceeds 5 psi in 15 seconds, inspect CAC
connections/joints for leaks. (refer to IK0900104 - Charge Air
Cooler Leak Test for additional steps)
C. Inspect hoses and clamps, interstage cooler, and CAC.
Is the CAC system and air intake system free of restrictions,
leaks, or physical damage?
Step Action

Decision
Yes: After completing all diagnostic
steps, if SPN 5397 FMI 31 remains,
verify each step was completed
correctly and proper decisions were
made.

8

Inspect exhaust system restrictions, leaks or physical damage
(PreDOC/DOC/DPF/SCR Systems). Inspect exhaust manifold for
large leaks/soot traces.
Open a Technical Service case
file. Include all diagnostic steps
Is the exhaust system free of restrictions, large leaks or physical performed and attach a 0-60 WOT
damage?
performance snapshot to the case.

No: Repair exhaust leaks. After
repairs are complete retest for SPN
5397 FMI 31
NOTE: These steps have been added to the latest N9/N10 diagnostic manual available on the Service Portal (0000003721).
The article will stay active until a later date.
WARRANTY INFORMATION
Warranty Claim Coding:
After Treatment Lights On
Group: 12000 Engines
Noun:

235 DPF-Diesel particulate filter

Standard Repair Time(s):
Description

Model

SRT Link

Hours

DPFDP sensor replace

All

A12-8575A

0.3

DPFDP sensor diagnostics

4400

L12-2193K

0.6

DPFDP sensor diagnostics

7300, 7400, 7500

M12­2193K

0.6

DPFDP tubes, replaced

4300, 4400

KL12­6577A

0.4

DPFDP tubes, replaced

7300, 7400, 7500

M12­6577A

0.4

Charge Air Cooler, Pressure Test

MAXXFORCE DT/9/10

KL09-3925T-1

0.5

ECM - Engine, Program

MAXXFORCE DT/9/10

A12-3510T

0.4

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