PI 0847

Service Program
Trucks
Mack Trucks, Inc.
Greensboro, NC USA
This Service Program replaces PV729–PI0847 (USA 65290), “Fuel
Management Module, Replacement” dated 7.2014.
Date
Group
No.
Release
Page
7.2014
386
847
02
1(10)
Fuel Management Module, Replacement
CXU
w/LNG
PI0847, Fuel Management Module, Replacement
(July 2014)
On certain Mack LNG (Liquid Natural Gas) models, built between 08/01/2013 and
05/09/2014, the low fuel warning may come on too early. In addition the fuel gauge may show
full if the fuel level sensor signal becomes open. This is due to the fact that the software in the
fuel management module (FMM) did not have the correct calibration and open circuit fault
criteria.
To correct this issue follow the procedure below:
Required Parts
Quantity
Part Number
1
85142764
Description
Control Unit LNG Fuel Levels
Repair
You must read and understand the precautions and guidelines in Service Information,
group 3, “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.
Rail Mounted FMM
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.
W7086748
PV729-PI0847
USA66020
Mack Trucks, Inc.
Service Program
Date
7.2014
Group
No.
Release
386
847
02
2 Turn the LNG fuel system off, follow procedures as outlined:
2a. Ensure the vehicle is in a well ventilated area.
2b. Turn the Manual Fuel System valve (red knob) to Closed on both tanks (if applicable).
W3091875
1. Shut-off Valve
W3091529
1. Shut-off Valve
2c. Start the vehicle and run the engine until it stops.
2d. Remove ignition key.
Note: This will ensure the vehicle is off and proper vehicle lock-out procedures have been
followed.
Note: The system is now depressurized and all fuel is confined to the tank.
Page
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Mack Trucks, Inc.
Service Program
Date
7.2014
Group
No.
Release
386
847
02
3 Disconnect all cables from the negative (ground) battery terminals to prevent personal
injury from electrical shock and prevent damage to electrical components.
W3086747
Page
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Mack Trucks, Inc.
Service Program
Date
7.2014
4 Disconnect the FMM harnesses.
W3091876
1. FMM Module
W3091186
1. Harnesses
Group
No.
Release
386
847
02
Page
4(10)
Mack Trucks, Inc.
Service Program
Date
7.2014
5 Remove FMM.
W3091187
1. Fasteners
2. FMM Module
6 Install new FMM
W3091187
1. Fasteners
2. FMM Module
Group
No.
Release
386
847
02
Page
5(10)
Mack Trucks, Inc.
Service Program
Date
7.2014
7 Connect the FMM harnesses.
W3091186
1. Harnesses
Group
No.
Release
386
847
02
Page
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Mack Trucks, Inc.
Service Program
Date
7.2014
Group
No.
Release
386
847
02
8 Turn fuel system ON, follow procedures as outlined:
8a. Turn tank valve(s) on.
8b. “SLOWLY” turn the Fuel System Valve(s) (red knob) to OPEN.
W3091529
1. Shut-off Valve
W3091875
1. Shut-off Valve
Note: Allow approximately 10 seconds of time to perform.
CAUTION
Failure to slowly open valve could cause damage to system by high pressure gas if
opened too quickly.
Page
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Mack Trucks, Inc.
Service Program
Date
7.2014
Group
No.
Release
386
847
02
9 Install all the previously removed cables to the negative (ground) battery terminals.
W3086758
10 Start the engine and check for proper operation.
11 Remove the wheel chocks.
W7086759
Page
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Mack Trucks, Inc.
Service Program
Date
7.2014
Group
No.
Release
386
847
02
Note: To signify that the campaign has been completed, using a permanent-type marker
(such as a Sharpie®) write the campaign number (PI0847) 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 610264- 9465.
W8034103
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Mack Trucks, Inc.
Service Program
Date
7.2014
Group
No.
Release
386
847
02
Reimbursement
This repair is covered by an authorized Service
Program. Reimbursement is obtained via the
normal claim handling process.
UCHPReimbursement
eWarranty
Reimbursement
Claim Type (used only when uploading from the
Dealer Bus. Sys.)
41
41
Recall Status
Vehicle inspected, repair not required
1- Inspected
OK
Vehicle repaired per instruction
2- Modified
per instruction
Labor Code
Primary Labor Code
3866–03–09–03
0.3 hrs
2315F–ZP–96
0.3 hrs.
Take to take charge and determine campaign status
1700–16–01–01
0.3 hrs
101AA–0A–00
0.3 hrs
Causal Part
85142764
85142764
SCC Code
S6576
NA
Authorization Number
NA
PI0847
Expiration Date
07- July- 2015
07- July- 2015
Parts Disposition
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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