Countries: CANADA, UNITED STATES, MEXICO Document ID: IKO700115,

| Availability: ISIS, Bus ISIS, FleetISIS, IsSIR Revision: 18
I Major System: EXHAUST Created: 8/26/2021
Current Language: English Last Modified: 1/10/2023

Knowledge Base Other Languages: Francais, Author: William Knoth
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Title: QLS Emergency Calibration

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Applies To: 2016 and Newer B6.7, X15 and L9, and all A26

CHANGE LOG

Please refer to the change log text box below for recent changes to this article:

10/2023 - Corrected typo

03/2023 - Added note about A26 cal and AFC 21901 expiring on 12/31/2022

16/2022 - Added sections for parts updates and images explaining corrective actions to the parts
2112022 - Added section for the QLS extended service contracts w/ FAQs

UPDATE JAN 2023

As of 12/31/2022 the A26 QLS emergency calibration is no longer available. For all repairs performed after this date please order the required
parts. The calibration for the X15 and ISX product is set to expire on 1/13/2023.

UPDATE NOV 2022

Navistar has adequate inventory and supply to support a fix as fail repair strategy for the DEF head unit failures moving forward. To support this
strategy change the QLS Part number 4140918C91 has been taken off critical holds as of Nov 18th 2022 and is orderable through standard stock
orders. The remaining QLS PNs should be released from critical hold in the next few weeks. The FLS sensors are expected to be released
sometime after the first of the year. For details on the parts release please refer to G-Letter G-19-101271-A.

Any vehicle that has received the calibration should NOT have the QLS replaced once parts are made available. All vehicles that have
filed for the AFC and TRP will be put into a voluntary emission recall that will be released at a later date once the inventory levels in the
PDCs and Dealer network are sufficient to support this activity. Navistar will provide additional communication for the part removal and
calibration roll back on vehicles currently with the emergency calibration at a later date.

DESCRIPTION

This document is intended for information purposes only to inform the user about an emergency calibration release that has been approved by the
EPA and CARB to help provide relief from the global supply shortage of electrical components

The purpose of this calibration is to provide a short term calibration strategy that will allow vehicle operation with a failed DEF head unit / Quality
Level Sensor (QLS). Any vehicle that receives the emergency calibration will eventually be required to have it rolled back to a production level
calibration and a new QLS installed once parts become available, this will be managed through future communication once the parts supply has
stabilized and should NOT be performed until this future communication is released.

Any vehicle that receives this calibration will continue to require a QLS unit to be installed and DEF fluid to operate. The changes are only to the
strategies for the failure detection methods (outlined below under calibration identification section). It is also required that the customer letter
either linked in the Cummins TRP or the Navistar reference sheet 4328818R1 be printed and placed in the vehicle prior to the vehicle going back
into service. It is also strongly recommended that the driver be informed to the changes in the DEF gauge operation as outlined in the required
documentation.

SYMPTOM(s)

Diagnostic Trouble Code(s) & Dashboard Indicator Light(s):

[Cummins DTC/Light

[Description

|0-SPN3364-09 (Cummins Fault 3868)

|Aftertreatment Diesel Exhaust Quality - Abnormal Update Rate

|0-SPN3031-09 (Cummins Fault 4572)

[Aftertreatment Diesel Exhaust Tank Temperature - Abnormal
Update Rate

|0-SPN1761-09 (Cummins Fault 4677)

[Aftertreatment Diesel Exhaust Fluid Tank Volume - Abnormal
Update Rate

Navistar DTC/Light

Description

|0-SPN3516-19

|Aftertreatment Diesel Exhaust Concentration - Received network data
lerror

0-SPN1761-19

\Aftertreatment Diesel Exhaust Fluid Tank Volume - Received network
data error

The EPA and CARB has only granted Navistar limited use of the QLS emergency calibration as it
applies to the faults listed in the table above and diagnostic steps outlined in this article. The use
of this calibration in any other circumstances could be considered tampering of an emission level
component.

CALIBRATION IDENTIFICATION

Calibration Cross Reference Table:

Engine Production Calibration IQLS Emergency Calibration
A26 xxxxSUxB XxxxSUXZ

*For Cummins powered vehicles refer to TSB210187

With a Production Calibration:
When the ECM detects a fault associated with the SCR system tampering logic the engine warning light will be turned on. After one hour of
operation with the fault active the vehicle will enter a 25% de-rate. After 5 hours of operation with the fault active the vehicle will enter a Smph de-

rate. See figure #2 for the de-rate strategy. In some cases, with the SCR inducement faults active, an SCR reset will be required with the service
tool.

With the QLS Emergency Calibration:

The ECM may still log the QLS communication faults listed above, however it will not have any driver notification through a MIL or a de-rate
reaction. The ECM will still follow the original de-rate strategy for all other faults, including all other QLS faults (see figure #2). Therefore, this
calibration is not approved for any vehicle with faults other than the ones listed above

The function of the different DEF head unit sensors are being handled by other means.

+ DEF Quality will be monitored through SCR conversion efficiency

« DEF Tank thaw strategy will be through the ambient air temp

* DEF Tank empty will be determined by the ability of the DEF system to prime
¢ DEF Tank level will NOT function

With the DEF gauge not functioning the DEF Tank Miles to Empty will not read correctly or read N/A. Itis strongly recommended that the vehicle
be filled with DEF at every full stop to ensure the tank stays topped off

Depending on the DLB parameter setting the cluster may produce an audible alarm for low DEF level. The default setting is set to "No Alarm" for
all vehicles as built. This should only be checked if there is a complaint or it is known to have been changed. If the parameter has been changed
it will need to be returned to the original setting of "No Alarm". See figure #11 in the DEF cluster alarm section below.

The DEF tank level gauge will NOT function with the QLS emergency calibration. It may show
incorrect or empty at all times.

Note:

With the QLS emergency calibration the QLS communication faults will still be visible in Insite.
However, they will not be broadcasted to displayed in the cluster or in health reports. With the
IQLS emergency calibration installed, these fault codes should be ignored.

LT — HRZN Cluster

[Figure 1: DEF Level Gauge Reaction
[Item 1: DEF Level Gauge

Te
foley

1) Warning Only 2) 25% De-Rate 3) 40% 4) Final Inducement

De-Rate ** Smph De-Rate

Active SCR SPN 5246 SPN 5246 SPN 5246
fault FMI 15 FMI 16 FMIO

Figure 2: SCR System Tampering Inducement Faults

Item 1: For the first hour after a failure or tampering occurs there is a warning only, with no de-rate.

Item 2: Hour 1 to hour 5 there will be a 25% de-rate accompanied with fault code SPN 5246-15 AFT SCR operator inducement severity - Least
severe,

Item 3: After 5 hours from initial awareness the vehicle will ramp to 40% de-rate and will search for the finial inducement trigger accompanied
lwith fault code SPN 5246-16 AFT SCR operator inducement severity - Moderately severe.

Item 4: Once finial inducement is triggered the vehicle will ramp to a Smph de-rate accompanied with fault code SPN 5246-0 AFT SCR operator
inducement severity - Most severe.

Note: **The time between stage 3 and 4 will be determined based on the fault code and triggers. If repeated tampering occurs the time window
between stages will be reduced.

SPECIAL TOOL(s) / SOFTWARE

[Tool Description [Tool Number |Comments Instructions

|Cummins Insite Pro Software Fleet Count is required Refer to Cummins TRP# T2489

‘ ice) |NED.V7.6.81 |Only allows the Calibration with |instructions are provided through
NED (Navistar Engine Diagnostics) jor greater [fault code preset lpopup messages in NEDs

CALIBRATION REQUIRED SERVICE PARTS INFORMATION

Part Number Part Description Quantity Needed Notes
2644000R1 Heat Shrink Tubing 50mm 4 Or equivalent
306132C1 Tie Strap 1 Or equivalent

QLS SERVICE PARTS INFORMATION