FSB-373-019

Field Service Bulletin
Trucks
Mack Trucks, Inc.
Greensboro, NC USA
Date
Group
No.
Release
Page
11.13
373
019
01
1(4)
SB-10054057-9351
Transmission Connector (Multiple Open
Circuits)
CHU, CXU, GU, TD
FSB 373-019, Transmission Connector (Multiple
Open Circuits)
(November 2013)
On some Mack models built with an Allison transmission, between May 16, 2011 and August
9, 2013, may experience multiple open circuits in the 31 way transmission connector. This is
due to a supplier manufacturing issue with the connector. If this issue is found follow the
procedure below:
Inspection
1. Secure the vehicle for service by parking it on a flat level surface, applying the parking
brake, chocking the rear wheel, and placing the transmission in neutral.
2. Raise the hood.
3. Inspect harness for “Yellow” marking on harness.
a. If mark is present then no further action required. (Close the hood).
b. If NO mark present: see repair below.
W3085839
1. Approximate location of “Yellow” marking
PV729-FSB373-019_M
USA61362
Mack Trucks, Inc.
Field Service Bulletin
Date
11.13
Group
No.
Release
373
019
01
Required Parts
Quantity
Part Number
Description
1
25177012
Connector Cab Side
1
25177273
Connector Transmission Side
Repair Procedure
Note: Information is subject to change without notice.
Illustrations are used for reference only, and may differ slightly from the actual engine
version. However, key components addressed in this information are represented as
accurately as possible.
You must read and understand the precautions and guidelines in Service Information,
Function Group 30, "General Safety Practices, Electrical and Electronics" before
performing this procedure. If you are not properly trained and certified in this procedure,
ask your supervisor for training before you perform it.
1 Disconnect all cables from the negative (ground) battery terminals to prevent personal
injury from electrical shock and prevent damage to electrical components.
2 Remove the steering column cover (1) and the lower dash panel (2).
W2084109
Page
2(4)
Mack Trucks, Inc.
Field Service Bulletin
Date
11.13
Group
No.
Release
373
019
01
3 Remove the transmission connector. Remove the cab side connector nut from the mount
and pull connector out.
4 Remove the elbow backshell from the transmission connector.
Note: Keep to reinstall in later step.
5 Remove the tape from the harness approximately 152 mm (6 in.) back from the connector.
6 Extract the terminals from the Delphi connector one terminal at a time and insert it into the
same cavity of the Deutsch connector.
Note: Use recommended Deutsch removal tool (0411-240-2005) or equivalent tool that
can be purchased locally.
Note: Start from one side of the connector and slowly work your way across to the other
side.
Note: Double check extraction hole number against the insertion hole number each and
every time to ensure accuracy.
W3084149
Male Pin
W3084150
Female Socket
7 Reinstall the elbow back shell onto the rear of the transmission connector.
8 Repeat steps 5 and 6 on the cab side connector.
Note: Use recommended Deutsch removal tool (0411-240-2005) or equivalent tool that
can be purchased locally.
Note: Start from one side of the connector and slowly work your way across to the other
side.
Note: Double check extraction hole number against the insertion hole number each and
every time to ensure accuracy.
Page
3(4)
Mack Trucks, Inc.
Field Service Bulletin
Date
11.13
Group
No.
Release
373
019
01
Page
4(4)
9 Tape each side of the harness back to where it was originally.
10 Install connector into the mount and secure nut. Torque to 7.4–8.4 Nm (65–75 in-lb.)
11 Install lower dash panel (2) and steering column cover (1).
W2084109
12 Install the transmission harness to the mating connector and secure.
13 Lower hood.
14 Install all the previously removed cables to the negative (ground) battery terminals.
15 Start the vehicle and check transmission operation.
Reimbursement
This repair may be eligible for reimbursement if a product failure was experienced within time and mileage limits of
the applicable Warranty coverage. Reimbursement is obtained via the normal claim handling process.
Claim Type (used only when uploading from the Dealer Bus. Sys.)
01
Labor Code
Inspection Time
3231F-AE-80
0.3 hrs
Primary Labor Code
includes Inspection Time
3231G-AE-80
3.1 hrs
Causal Part
21682874 and 21682869
Mack Trucks, Inc. engages in a comprehensive program of testing and evaluating to provide
the best possible product. Mack Trucks, Inc. however, is not committed to, or liable for
updating existing vehicles.