IK1300186 Service Bulletin/Repair Instructions

IK1300186 - Auxiliary Transmission Diagnostics
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Countries:
CANADA, UNITED STATES
Availability:
ISIS, FleetISIS, Body Builder, IsSIR Revision:
Document ID: IK1300186
Major System:
TRANSMISSION
Created:
0

8/5/2020
Current Language: English
Last Modified: 8/12/2020
Other Languages: NONE
Author:
Viewed:
Charles Schroeder
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Title : Auxiliary Transmission Diagnostics

Applies To : Vehicles with feature 0013607 or 0013PNB controlled by DLB feature 0597268
CHANGE LOG

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

08/10/2020 - Initial Article Release.


DESCRIPTION

Overview information on the auxiliary transmission. This feature allows the driver to switch between Low, Neutral and High gears for the Auxiliary

Transmission. Low gear provides more torque for better rough off-road hauls. High gear is for normal driving. To shift ranges, the vehicle must be

stationary (no vehicle speed), and the ignition must be on. The system is controlled by a 3 position multiplexed switch, located in the center panel

switch pack. The Body Control Module (BCM) will send voltage to air solenoids depending on switch location. If a fault code is active, the air

solenoids will maintain last known state if possible.
SYMPTOMS

Diagnostic Trouble Codes & Dashboard Indicator Lights:

DTC/Light
Description
SPN 3957 FMI 5
Auxiliary Transmission Constant Supply Actuator :

Current Below Normal Or Open Circuit
SPN 3958 FMI 5
Auxiliary Transmission High Range Actuator :

Current Below Normal Or Open Circuit
SPN 3959 FMI 5
Auxiliary Transmission Neutral Actuator :

Current Below Normal Or Open Circuit
SPN 3957 FMI 6
Auxiliary Transmission Constant Supply Actuator :

Current Above Normal Or Grounded Circuit
SPN 3958 FMI 6
Auxiliary Transmission High Range Actuator :

Current Above Normal Or Grounded Circuit
SPN 3959 FMI 6
Auxiliary Transmission Neutral Actuator :

Current Above Normal Or Grounded Circuit
Customer Observations or Concerns:

• Stuck in Low Range

• Stuck in High Range

• Auxiliary transmission will not shift
SPECIAL TOOLS / SOFTWARE

Tool Description

Diamond Logic® Builder (DLB)
Tool Number
Comments
Instructions
EZ-Tech Software
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IK1300186 - Auxiliary Transmission Diagnostics
Page 2 of 5
SERVICE PARTS INFORMATION

,

Kit Description
Part Number
Quantity Required
BASE, MOUNTING SOLENOID 4 PACK
2505594C1
As Needed
KIT AIR BRK SOLENOID N.C. 12V

(VALVE, SOLENOID AUXILIARY

TRANSMISSION)
2506711C91
As Needed
Notes
DIAGNOSTIC STEPS

Step Action
Decision

Yes: Perform Circuit Checks from Body Control

Module (BCM) to Air Solenoid Switch Packs
DIAGNOSTIC:

#1
Use DLB to check for system faults.

Is a fault code present for any Auxiliary

Transmission Solenoids?
Step Action
No: Continue to Step 2
Decision

Yes: Verify driver complaint.
DIAGNOSTIC:

#2
Review auxiliary transmission shifting

Does the auxiliary transmission shift properly?
No: Verify air line routing from air solenoids to

auxiliary transmission air ports.
REPAIR STEP(S)

Below is designed operation of this feature. The Low Air Solenoid will provide constant pressure to the Auxiliary Transmission as required. When the

switch state changes the Neutral and High air solenoids will energize or de-energize. Make a session in DLB for feature 597268 to monitor the

switch state and air solenoid outputs. For more information on making a session in DLB, please refer to IK2600008 - How to Diagnose Electrical

Problems with Diamond Logic Builder. Solenoid location may vary by application. The location shown below on the left frame rail is typical. It may be

located on a crossmember as well. The table below outlines which solenoids will be active for each range.

• To troubleshoot a fault code, use the wiring schematic information to check the wiring from the BCM to the Air Solenoid Pack for the solenoid

that has a fault

• To troubleshoot a shifting complaint, verify the air solenoids are being commanded properly, and that the air lines are connected to the correct

port on the auxiliary transmission

Air Solenoid Operation

Low Range
Neutral
High Range
Low Air Solenoid = Active

Neutral Air Solenoid = Inactive

High Air Solenoid = Inactive
Low Air Solenoid = Active

Neutral Air Solenoid = Active

High Air Solenoid = Inactive
Low Air Solenoid = Active

Neutral Air Solenoid = Inactive

High Air Solenoid = Active
DLB Session 0597268
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IK1300186 - Auxiliary Transmission Diagnostics
Page 3 of 5
• Aux_Xmsn_Solenoid_A_Cmd (1602-E12) controls Low Range (Constant Air)

• Aux_Xmsn_Solenoid_B_Cmd (1601-F10) controls Neutral

• Aux_Xmsn_Solenoid_C_Cmd (1601-E12) controls High Range
Wiring Information
Air Line Ports at Auxiliary Transmission
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IK1300186 - Auxiliary Transmission Diagnostics
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Solenoid and Airline Overview
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

Master Service Information Site

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Copyright © 2020 Navistar, Inc.
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