FSB284-069

Mack Trucks
Greensboro, NC USA
Field Service Bulletin
Trucks
Date
Group
No.
Release
Page
11.2018
284
069
01
1(6)
Exhaust Particulate Sensor, Repair
2017 Models
CXU, CHU, GU
FSB 284-069, Exhaust Particulate Sensor, Repair
(2017 Vehicles)
(November 2018)
Some trucks built between 1/1/2017 and 11/14/2017 may experience a Particulate Matter
(PM) Sensor fault that can result in the MIL lamp illuminating. These faults may be P24DA,
“PM Sensor Exhaust Sample Error,” or P24D1, “PM Sensor Regen Incomplete.” These faults
may be caused by contamination of the PM sensor. In order to reduce the likelihood of
sensor contamination, new exhaust pipe parts are being made available that contain an
internal water management feature along with an integrated drain that will prevent
contamination of the sensor. If either of these two faults occur, follow the instructions outlined
in this bulletin to clean the exhaust pipes and install a new exhaust pipe with the new
contamination prevention measures.
PV729-FSB284-069_M
USA142168011
Mack Trucks
Field Service Bulletin
Date
11.2018
Group
No.
Release
284
069
01
Required Parts – All Years
Inspect and replace the v-band clamp as needed
A new gasket will be needed when disconnecting the SCR exit.
Note: No gasket needed for vertical SCR.
Part Description
Part Number
SCR Gasket
21095726
V-band Clamp
21021850
Particulate Matter Sensor
22946032
Note: Customer adaptations can change required parts. Check for adaptations before
ordering parts.
Parts List – 2017 Vehicles
Model
Cab
Type
Exhaust
Configuration
Pipe 1
Part
Number
Pipe 2
Part
Number
Flex Pipe
Part
Number
Clamp
Part
Number
(Qty will
vary)
CX/CH/
GU8
Day Cab
Single
Outlet
Right Side
Outboard
(Not
Bright)
23155759
(Bright)
23155760
N/A
23154829
20961913
GU7
Day Cab
without
front
body
attachment
plate
Single
Outlet
Right Side
Inboard
(Not
Bright)
23155764
(Bright)
23155765
N/A
23154829
20961913
GU7
Day Cab
with front
body
attachment
plate
Single
Outlet
Right Side
Outboard
(Not
Bright)
23155766
(Bright)
23155767
N/A
23154829
20961913
CX/CH
Day Cab
Single
Outlet
Right Side
Inboard
(Not
Bright)
23155769
(Bright)
23155770
N/A
23154829
20961913
Page
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Mack Trucks
Field Service Bulletin
Date
11.2018
Group
No.
Release
284
069
01
GU7
Day Cab
Dual
Outlet
(Not
Bright)
23155776
(Bright)
23155777
(Not
Bright)
23189087
(Bright)
23189089
23154829
20961913
CX/CH/
GU8
Day Cab
Dual
Outlet
Outboard
(Not
Bright)
23155779
(Bright)
23155780
N/A
N/A
N/A
CX/CH
Day Cab
Dual
Outlet
Inboard
(Not
Bright)
23155782
(Bright)
23155783
N/A
N/A
N/A
All
All
Sleepers
All
(Not
Bright)
23154798
(Bright)
23154799
N/A
N/A
N/A
Twin Steer
GU7
GU8
All
All
(Not
Bright)
23181996
(Bright)
23181995
N/A
N/A
N/A
Model
Exhaust
Configuration
Pipe Part Number
GU8
Cab Mounted
Vertical Stack
23155787
GU7
Cab Mounted
Vertical Stack
23155789
23204566
Page
3(6)
Mack Trucks
Field Service Bulletin
Date
11.2018
Group
No.
Release
284
069
01
Instructions
1 Decommission the vehicle. Install wheel chocks and disconnect the battery.
W7086748
W3086747
2 Remove the PM sensor and module.
3 Remove all exhaust pipes up to the SCR outlet pipe.
4 Pressure wash the inside of each pipe that will be reused.
5 Reassemble the exhaust system using the new parts referenced in the table above.
6 Mark the SCR outlet pipe 1.5" from the end also mark the new pipe (not flex) 1.5" from its
inlet.
7 Slip the flex pipe as for over the SCR outlet pipe as possible.
8 Install the new exhaust pipe.
9 Using a new clamp assemble the new exhaust pipe to the new flex pipe using the 1.5"
mark to get the correct amount of overlap.
10 Slide the assembly into place using the 1.5" mark on the SCR outlet as a reference point
and to ensure the correct amout of overlap, once in both pipes are in place use clamps to
secure.
Note: Correct installation is achieved when the flex pipe is in a "relaxed" state, there
should be no compression or expansion visible on oposing sides of the pipe after
installed.
11 Install the new PM sensor and module.
Note: Do not use any lubricant of any kind on the PM sensor threads.
Note: Align the tab on the sensor with the slot.
12 Torque the sensor to 35 +/- 5 Nm (26+/- 4 Ft lb)
13 Install the sensor module.
14 Torque the nuts to
M6: 10 +/- 5 Nm (88 +/- 3 in lb)
M8: 24 +/- 4 Nm (17.1 +/- 3 ft lb)
15 Install the wire ties and clamps.
Note: Use high temperature cable ties.
Page
4(6)
Mack Trucks
Field Service Bulletin
Date
11.2018
Group
No.
Release
284
069
01
16 Connect the battery.
W3086758
17 Clear any DTC codes.
18 Remove the wheel chocks.
W7086759
Page
5(6)
Mack Trucks
Field Service Bulletin
Date
11.2018
Group
No.
Release
284
069
01
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.
UCHP
Reimbursement
Claim Type (used only when uploading from the Dealer
Bus. Sys.)
W
Labor Code
Primary Labor Code (Exhaust Particulate Sensor, Repair)
2846-16-09-01
See table for times.
Causal Part
22946032
Labor Times Reference – 2017 Vehicles
Model
Cab Type
Exhaust
Configuration
Pipe 1 Part Number
CX/CH/GU8
Day Cab
Single Outlet Right
Side Outboard
1.5 hr
GU7
Day Cab without
Transmission
Plate
Single Outlet Right
Side Inboard
1.5 hr
GU7
Day Cab with
Transmission
Plate
Single Outlet Right
Side Outboard
1.5 hr
CX/CH
Day Cab
Single Outlet Right
Side Inboard
1.5 hr
GU7
Day Cab
Dual Outlet
2.9 hr
CX/CH/GU8
Day Cab
Dual Outlet Outboard
2.9 hr
CX/CH
Day Cab
Dual Outlet Inboard
2.9 hr
All
All Sleepers
All
2.8 hr
Twin Steer GU7 &
GU8
All
All
1.7 hr
GU7
Cab mounted vertical
stack
1.2 hr
GU8
Cab mounted vertical
stack
1.2 hr
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