IK0700082 - N9/N10/N13 Aftertreatment Fault Codes Caused by Incorrect DPF Different... Page 1 of 10

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Title : N9/N10/N13 Aftertreatment Fault Codes Caused by Incorrect DPF
Differential Pressure Sensor Orientation
Applies To : All Navistar Powered SCR Vehicles

Change Log
Please refer to the change log text box below for recent changes to this article:
03/29/2016 ‐ Revised fault code list
11/18/2015 ‐ Added "Claim Comments Suggestion"
09/15/2015 ‐ Revised wording for diagnostic step 2 "yes" decision
04/17/2015 ‐ Fixed images
04/16/2015 ‐ Initial Article Release





Description
The aftertreatment DPF differential pressure sensor can be installed in an incorrect
orientation (Figure 1). This orientation of the sensor allows moisture to be trapped inside
the sensor and/or sensor tubes. The trapped moisture affects the signal processing of the
sensor when reading the pressure inside the DPF, leads to incorrect pressure readings, and
Fault Code(s) 3251‐2, 3251‐16, 3251‐0, 3936‐15, 3251‐15, 3610‐2, and 3936‐16 being set.
NOTE:
For Cummins powered vehicles, refer to TSB 140105 located on QuickServe Online.

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Figure 1: Incorrect DPF differential pressure sensor orientation

Symptoms
Possible Diagnostic Trouble Code(s) & Dashboard Indicator Light(s):
SPN FMI Description

Lamp

3251 2 DPFDP SignalErratic, Intermittent, or Incorrect Amber
3936 15 DPF System Above Warning Pressure

Amber

3936 16 DPF System Above Maximum Pressure

Amber

3610 2 DPF OP Signal Erratic, Intermittent, or Incorrect Amber
3719 0 DPF Soot Load ‐ Highest

Red

3719 15 DPF Soot Load ‐ Lowest

Amber

3719 16 DPF Soot Load ‐ Moderate

Amber

Special Tools / Software
Not Applicable

Service Parts Information
No parts necessary

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Diagnostic Steps
Step Action

Decision

VERIFY CONCERN:
1

Yes: Go to step 2.

Reference electronic service tool to read the fault
codes. Check for Fault Code(s) 3251‐2, 3936‐15, 3936 No: Exit this article and
‐16, 3610‐2, 3719‐0, 3719‐15, 3719‐16.
diagnose appropriate fault
codes.
Are any of the listed fault codes active or inactive?

Step Action

2

Decision

Yes: Return to
VISUAL INSPECTION:
appropriate Fault
Code Action Plan
Visually inspect the aftertreatment DPF differential pressure (FCAP) to continue
sensor to confirm its orientation. 0 to 10 degrees is
troubleshooting fault
acceptable (Figure 2). Any amount of droop below 0
codes.
degrees is not acceptable (Figure 3).
No: Follow the steps
below in the Repair
Is the DPF differential pressure sensor installed in the
Steps section and
correct orientation?
retest for active fault
codes. Do NOT install
NOTE:
a new DPF differential
0 degrees is acceptable
pressure sensor.
Figure 2: Correct Orientation ‐ Between 0 and 10 degrees

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Figure 3: Incorrect Orientation ‐ Below 0 degrees

Repair Steps
The DPF differential pressure sensor tubes should have a 0‐10 degree downward slope
away from the sensor ports whether in a vertical or horizontal aftertreatment
configuration. A 0‐10 degree sensor tube downward angle is recommended to make sure
that no cavity exists in the tubes to collect moisture.
A video has been created to help illustrate the following adjustment procedure. Watch the
two videos below to view the repair from start to finish.

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Repair Procedure
Align the temperature coupling on the diesel oxidation catalyst (DOC) inlet (stamped T1)
and the temperature coupling on the DPF (stamped T2). If they are not aligned, loosen the
band clamps and align the temperature sensor probes by rotating the aftertreatment DPF

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canister. Figure 4 below shows the difference in mounting between a canister mounted
and remote mounted DPFDP sensor. Refer to appropriate section for repair steps below.
NOTE:
Reference Section 9 for switchback/horizontal or Section 10 for vertical/vertical exhaust
configurations of the Exhaust Aftertreatment System with DPF and SCR Service Manual
for assistance.
Figure 4: Canister mounted (left) versus remote mounted (right) DPFDP sensor

Item 1: DPF DP Tubes
Item 2: DPF DP Sensor Port Fittings
Item 3: DPF DP Tube P‐Clips

Item 1: DPF DP Tubes
Item 2: DPF DP Sensor Port Fittings

For canister mounted aftertreatment DPF differential pressure sensors on horizontally
mounted DPF applications:
1. Loosen the DPF differential pressure sensor mounting bracket strap and allow the
DPF differential pressure sensor tubes to locate the aftertreatment DPF differential
pressure sensor bracket on the aftertreatment DPF Canister.
2. Mark the location of the DPF differential pressure sensor bracket on the
aftertreatment DPF canister by pressing the DPF differential pressure sensor bracket
against the DPF canister and tracing along the bottom of the DPF differential pressure
sensor bracket (Figure 5).
Figure 5: DPF differential pressure sensor orientation with marking from previous incorrect
orientation

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3. Rotate the DPF differential pressure sensor bracket by moving it toward the top of
the DPF canister to achieve a 0‐10 degree sensor tube downward angle. Do not move
the sensor mounting bracket more than 19 mm [3/4 in] above the reference mark.
NOTE:
When rotating the sensor mounting bracket, make sure to allow for clearance with
surrounding components. A minimum clearance of one inch is required around the
sensor mounting bracket and any surrounding components in order to prevent damage.
4. Tighten the aftertreatment DPF differential pressure sensor mounting bracket strap
to 7 N•m [5 ft‐lb].
5. Adjust the DPF Differential pressure sensor port fittings to match the 0‐10 degree
downward angle (Figure 4). Tighten the upstream DPF differential pressure sensor
port fitting after adjustment to 31 N•m [23 ft‐lb]. Tighten the downstream DPF
differential pressure sensor port fitting after adjustment to 17 N•m [13 ft‐lb].
6. Loosen the tube retention clips located at the aftertreatment DPF differential
pressure sensor elbow fittings. Rotate the DPF differential pressure sensor tubes to
achieve a 0‐10 degree sensor tube downward angle.
7. If needed, shorten the tubes to achieve a 0‐10 degree sensor tube down angle. Up to
9.5 mm [3/8in] can be cut off the aftertreatment DPF differential pressure sensor
elbow fitting end of each DPF differential pressure sensor tube. Remove the same
amount of material from both tubes. Use a cutting tool that will make sure of a clean
cut.

For canister mounted aftertreatment DPF differential pressure sensors on vertically
mounted DPF applications:
1. Mark the location of the DPF differential pressure sensor bracket on the
aftertreatment DPF canister by pressing the DPF differential pressure sensor bracket

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against the DPF canister and tracing along the bottom of the DPF differential pressure
sensor bracket.
2. Loosen the DPF differential pressure sensor mounting bracket strap and the p‐clip
holding the upstream aftertreatment DPF differential pressure sensor tubes.
3. Adjust the downstream sensor port fittings to achieve a 0‐10 degree downward angle.
Tighten the upstream DPF differential pressure sensor port fitting after adjustment
to 31 N•m [23 ft‐lb]. Tighten the downstream DPF differential pressure sensor port
fitting after adjustment to 17 N•m [13 ft‐lb].
4. Move the DPF differential pressure sensor bracket toward the top of the DPF canister
to achieve a 0‐10 degree downward angle on downstream sensor tube. Do not move
the sensor mounting bracket more than 16 mm [5/8 in] above the reference mark.
NOTE:
When rotating the sensor mounting bracket, make sure to allow for clearance with
surrounding components. A minimum clearance of one inch is required around the
sensor mounting bracket and any surrounding components in order to prevent damage.
5. Tighten the aftertreatment DPF differential pressure sensor mounting bracket strap
to 7 N•m [5 ft‐lb]. Tighten the p‐clip to 14 N•m [10 ft‐lb].
6. If needed, shorten the upstream sensor tube to achieve a continuous down angle. Up
to 9.5 mm [3/8in] can be cut off the differential pressure sensor elbow fitting end of
upstream sensor tube. Do not shorten the downstream sensor tube. Use a cutting
tool that will make a clean cut.

For remotely mounted aftertreatment DPF differential pressure sensors:
1. Adjust the DPF differential pressure sensor port fittings to match the 0‐10 degree
downward angle. Tighten the upstream DPF differential pressure sensor port fitting
after adjustment to 31 N•m [23 ft‐lb]. Tighten the downstream DPF differential
pressure sensor port fitting after adjustment to 17 N•m [13 ft‐lb].
2. If needed, shorten the tubes to achieve a 0‐10 degree sensor tube downward angle.
Up to 24 mm (1 in) can be cut off the aftertreatment DPF differential pressure sensor
elbow fitting end of each DPF differential pressure sensor tube. Remove the same
amount of material from both tubes. Use a cutting tool that will make sure of a clean
cut.

Warranty Information
Warranty Claim Coding:

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Group: 12000 ‐ Engine
Noun: 575 ‐ Sensor, DPF Differential Pressure Sensor
Claim Comment Suggestion:
It is recommended this iKNow article number (IK0700082) is included in the claim
comments when the differential pressure sensor tube orientation procedure is completed.
Standard Repair Time(s):
Use the SRT Code to verify up the repair time in the Standard Repair Time Manual
SRT Code Description

Chassis

A18‐1651
‐UT‐20

All Models

N18‐
1651US‐
20

7600

Q18‐
1651US‐
20

Aftertreatment
Components , Replace
DPF Delta P Tubes

N13
ProStar

T18‐
1651US‐
20

5000

GY18‐
1651TS

CE/ BE

KL18‐
1651TS
M18‐
1651TS

4300, 4400

Hours

N13 Update
s/n: 4400000 and up

8600

R18‐
1651US‐
20

Aftertreatment
Components, Replace
( N9/10)
DPF Delta P Tubes

Engine

N9/10

Click
Here

Click
Here

7300, 7400, 7500

Other Resources

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Master Service Information Site
Exhaust Aftertreatment System with DPF and SCR Service Manual EPA 2010
Cummins TSB 140105
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