FSB284-068

Mack Trucks
Greensboro, NC USA
Field Service Bulletin
Trucks
This Field Service Bulletin replaces FSB 284-068 dated 11.2018
Date
Group
No.
Release
Page
11.2018
284
068
02
1(6)
Exhaust Particulate Sensor, Repair
2016 Models
CXU, CHU, GU
FSB 284-068, Exhaust Particulate Sensor, Repair
(2016 Vehicles)
(November 2018)
Some trucks 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-FSB284-068_M
USA143599951
Mack Trucks
Field Service Bulletin
Date
11.2018
Group
No.
Release
284
068
02
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 – 2016 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/
GU
Day Cab
Single
Outlet
Right Side
Outboard
(Not
Bright)
23154801
(Bright)
23154802
N/A
23154829
20961913
CX/CH/
GU
Day Cab
Single
Outlet
Right Side
Inboard
(Not
Bright)
23154804
(Bright)
23154807
N/A
23154829
20961913
Titan
Day Cab
Dual
Outlet
23154811
23207482
23154829
20961913
CX/CH/
GU
Day Cab
Dual
Outlet
Outboard
(Not
Bright)
23154813
(Bright)
23154814
(Not
Bright)
23202241
(Bright)
23202243
23154829
20961913
CX/CH/
GU
Day Cab
Dual
Outlet
Inboard
(Not
Bright)
23154816
(Bright)
23154817
(Not
Bright)
23202244
(Bright)
23202245
23154829
20961913
Page
2(6)
Mack Trucks
Field Service Bulletin
Date
11.2018
Group
No.
Release
284
068
02
All
All
Sleepers
N/A
(Not
Bright)
23154798
(Bright)
23154799
(Not
Bright)
23200550
(Bright)
23200551
23154829
20961913
GU Twin
Steer Axle
Day Cab
SCR
Horizontal
Mid Mount
(Not
Bright)
23181996
(Bright)
23181995
N/A
N/A
N/A
All
Day Cab
11.5 ft
Exhaust
Stack
Right Side
(Not
Bright)
23208695
(Bright)
23153180
N/A
23296273
23189982
(x2)
All
Day Cab
11.5 ft
Exhaust
Stack Left
Side
(Not
Bright)
23153179
(Bright)
23208696
N/A
23296273
23189982
(x2)
All
Day Cab
12.5 ft
Exhaust
Stack
Right Side
(Not
Bright)
23208700
(Bright)
23208701
N/A
23296273
23189982
(x2)
Model
Exhaust
Configuration
Pipe Part
Number
Steel Tube
Part Number
Adapter Part
Number
GU7
Forward
mounted SCR
with B-pillar
mounted
forward stack
23154819
23204515
21985642
GU7
GU8
Rearward
mounted SCR
with B-pillar
mounted
forward stack
23154821
23204515
21985642
Page
3(6)
Mack Trucks
Field Service Bulletin
Date
11.2018
Group
No.
Release
284
068
02
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. Wipe out the inside of the SCR
outlet pipe
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
068
02
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
068
02
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 – 2016 Vehicles
Model
Cab Type
Exhaust
Configuration
Pipe 1 Part Number
CX/CH/GU
Day Cab
Single Outlet Right
Side Outboard
2.1 hr
CX/CH/GU
Day Cab
Single Outlet Right
Side Inboard
2.1 hr
CX/CH/GU/Titan
Day Cab
Dual Outlet
2.8 hr
CX/CH/GU
Day Cab
Dual Outlet Inboard
2.8 hr
All
All Sleepers
N/A
3.5 hr
GU Twin Steer Axle
Day Cab
SCR Horizontal Mid
Mount
1.7 hr
All
Day Cab
11.5 ft Exhaust Stack
Left & Right Side
0.9 hr
All
Day Cab
12.5 ft Exhaust Stack
Right Side
0.9 hr
GU
Forward mounted
SCR with B-pillar
mounted forward
stack
1.9 hr
GU
Rearward mounted
SCR with B-pillar
mounted forward
stack
1.8 hr
Page
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