SB-10044335-6016

Service Program
Trucks

Mack Trucks, Inc.
Greensboro, NC USA

This Field Service Bulletin replaces
bulletin, “PI0781, Engine VGT
Actuator and TSS Sensor Connector,
Relocation”, PV729–PI0781
(USA53761) dated (05/2012).

Date

Group

No.

Release

Page

6.2012

255

781

03

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Engine VGT Actuator and TSS Sensor
Connector, Relocation
CHU, CXU, GU, MRU
MP8

PI0781, Engine VGT Actuator and TSS Sensor
Connector, Relocation
(June 2012)

A new campaign is available to prevent engine diagnostic trouble codes (DTCs) and missing
signal from the Engine Variable Geometry Turbocharger Actuator (Engine VGT Actuator) on
MACK MP8 US2010 engines with a Mechanical transmission. This condition is caused by
fretting of the connector pins in the engine VGT actuator connector. Relocation of the engine
VGT actuator connector and a new mounting arrangement has been developed to eliminate
this condition. See the table below for the list of parts required for this campaign.
Note: This bulletin does not apply to MACK Trucks Australia.

W2072567

Required Parts
Mechanical Transmission Parts List

PV729-PI0781

Item #

QTY

Part Number

Description

1

2

980881

Push-In Cable Tie

USA53869

Mack Trucks, Inc.
Service Program

Date
6.2012

Group

No.

Release

255

781

03

Relocation Procedures for the Mechanical Transmission
You must read and understand the precautions and guidelines in Service Information,
group 20, "General Safety Practices, Engine" before performing this procedure. If you
are not properly trained and certified in this procedure, ask your supervisor for training
before you perform it.

NOTE: Information is subject to change without notice. Illustrations are used for reference
only and can differ slightly from the actual vehicle being serviced. However, key
components addressed in this information are represented as accurately as possible.

Mechanical Transmission
1 Apply parking brake and place shift lever in neutral.
2 Raise hood or raise cab.
3 Disconnect all cables from the negative (ground) battery terminals to prevent personal
injury from electrical shock and prevent damage to electrical components.
4 Disconnect the engine VGT actuator and Turbine Shaft Speed (TSS) Sensor harnesses.

W2072330

Page
2( 7 )

Mack Trucks, Inc.
Service Program

Date
6.2012

Group

No.

Release

255

781

03

5 Remove the engine VGT actuator and TSS sensor connectors from the mounting bracket.
Note: Discard the attachment ring/nut (Item 1).

W2072331

6 Remove the connector mounting bracket from oil filter housing.
Note: Discard the mounting bracket.

W2072332

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Mack Trucks, Inc.
Service Program

7

Date
6.2012

Group

No.

Release

255

781

03

Inspect connectors for green/brown dust on the pins or sockets.
Note: If green/brown dust is present in the areas highlighted in the figure below, clean
the male and female engine VGT actuator and TSS sensor connectors with approved
electrical solvent. Allow the connectors to thoroughly dry before assembly.

W2072325

8 Install the push-in cable ties (part number 980881) into the M8 threaded holes in the oil
filter housing.
Note: Ensure the push-in cable tie flanges are tightly secured against the M8 threaded
holes in the oil filter housing.

W2072333

Page
4( 7 )

Mack Trucks, Inc.
Service Program

Date
6.2012

Group

No.

Release

255

781

03

9 Connect and lock the engine VGT actuator and TSS sensor connectors together.

W2072334

10 Secure both connectors with the push-in cable ties.
Note: Ensure the cable tie is in the end groove between connector flange and back
shell as shown in figure below.

W2072335

11 Reconnect all previously removed cables to the negative (ground) battery terminals.
12 Lower hood or lower cab.

Page
5( 7 )

Mack Trucks, Inc.
Service Program

Date
6.2012

Group

No.

Release

255

781

03

Note: To signify that the campaign has been completed, using a permanent-type marker
(such as a Sharpie®) to write the campaign number (PI0781) and completion date in the
spaces provided on the Campaign Completion label located inside the cab as shown in the
illustration below. If a label is not already affixed inside the cab, apply a label (part No.
TS897) and supply the information as required. Campaign Completion labels are available
in packs of 50 and can be ordered by faxing a completed BR313 to Pacesetters Business
Services at 610-264- 9465.

W8034103

W0037061

Page
6( 7 )

Mack Trucks, Inc.
Service Program

Date
6.2012

Group

No.

Release

255

781

03

Reimbursement
This repair is covered by an authorized Service Program. Reimbursement is
obtained through the normal claim handling process.
Claim Type (used only when uploading from the Dealer Bus. Sys.)

B

Recall Status
Vehicle inspected, repair not required

1- Inspected OK

Vehicle repaired per instruction

2- Modified per
instruction

Labor Code
Primary Labor Code

2733J-37-96
0.3 hr.

Time to take charge and determine campaign status

101AA–0A–00
0.3 hr.

Causal Part

21551428

Authorization Number

PI0781

Expiration Date

16 MAY 13

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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