PI 0858

Service Program
Trucks
Mack Trucks, Inc.
Greensboro, NC USA
Date
Group
No.
Release
Page
1.2015
364
858
01
1(2)
Vehicle Electronic Control Unit (VECU),
Reprogramming
Vehicle Speed Sensor (VSS)
CHU, CXU
PI0858, Vehicle Electronic Control Unit (VECU),
Reprogramming
Vehicle Speed Sensor
(January 2015)
Certain MACK CHU, and CXU trucks built from 10/21/2010 to 02/28/2011, and equipped with
an mDRIVE transmission may experience engine over-rev past the governed speed while the
transmission is attempting a shift. This condition could cause erratic shifting and/or over
speed messages in the instrument cluster (IC) due to incorrect parameters settings. Follow
the repair procedure outlined in this document to correct the parameter settings.
Note: This bulletin does not apply to MACK Trucks Australia.
VECU Reprogramming Procedure
You must read and understand the precautions and guidelines in Service Information,
group 30, "General Safety Practices, Electrical" before performing this procedure. If you
are not properly trained and certified in this procedure, ask your supervisor for training
before you perform it.
DANGER
Do not attempt to repair or service this vehicle without having sufficient training, the correct
service literature and the proper tools. Failure to follow this could make the vehicle unsafe
and lead to serious personal injury or death.
1 Park the vehicle on a level surface.
2 Apply the parking brake.
3 Place the transmission in neutral or park.
4 Install the wheel chocks.
W7086748
PV729-PI0858
USA68406
Mack Trucks, Inc.
Service Program
Date
1.2015
Group
No.
Release
364
858
01
5 Using the latest version of Premium Tech Tool (PTT), run accessory kit 85145303.
6 Once the accessory kit is complete, select MID 144 (VECU programming) and begin
programming.
Note: Follow the on screen prompts until programming is complete.
7 Remove the wheel chocks.
W7086759
Reimbursement
This repair is covered by an authorized
Service Program. Reimbursement is
obtained through the normal claim handling
process.
UCHP
Reimbursement
eWarranty
Reimbursement
Claim Type (used only when uploading from
the Dealer Bus. Sys.)
B
B
Vehicle inspected, repair not required
1- Inspected OK
1- Inspected OK
Vehicle repaired per instruction
2- Modified per
instruction
2- Modified per
instruction
Primary Labor Code
3646–22–09–03
0.4 hrs
2304K–43–96
0.4 hrs.
Time to take charge and determine campaign
status
1700–16–01–01
0.3 hrs
101AA–0A–00
0.3 hrs
Causal Part
21066169
21066169
SCC Code
S6529
N/A
Authorization Number
N/A
PI0858
Expiration Date
01-JAN-2016
01-JAN-2016
Recall Status
Labor Code
Note: Take Charge Time is not included in the Labor Code for this operation. Take charge
may be eligible but can only be used once per repair visit. If vehicle is having other warranty
repairs performed, take charge should be charged to the warranty repair, otherwise take
charge can be charged to this service program.
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