NHTSA ID Number: 10126627
Manufacturer Communication Number: SP 386-004
TSB/Document Date: 2017-12-22
Summary
Fuel Management Module, Replacement, incorrect calibration
Service Program
Trucks
Volvo Trucks
North
America
Greensboro, NC USA
Date
This SP replaces PV729-SP386–004 (USA65209), “Fuel
Management Module, Replacement” dated 10.2014.
10.2014
Group
No.
386 004
Release
Page
02
1(37)
Fuel Management Module, Replacement
VN
SP 386-004, Fuel Management Module,
Replacement
(October 2014)
On certain Volvo CNG (Compressed Natural Gas) models, built between 03/19/2011 and
07/25/2014, the low fuel warning may come on too early and the fuel gauge may show full if
the fuel level sensor signal becomes open. In addition the gauge may show lower tank levels
at cold temperatures or higher tank levels at hotter temperatures. This is due to the fact that
the software in the fuel management module (FMM) did not have the correct calibration, open
circuit fault criteria and was not temperature compensated.
To correct this issue follow the procedure below.
Inspection
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.
The FMM may be located on the rail with frame mounted tank or either inside or outside of the
access door with a cabinet mounted tanks.
Look to see where the shut off valve is located and choose the correct repair below when
replacing the 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
USA67437
PV729-SP386-004
English
Volvo Trucks North America
Service Program
Date
10.2014
Group
No.
Release
386
004
02
2 Check to see where the FMM is mounted by locating the shut off valve per the illustrations
below.
W3091600
Repair A: Tank mounted
Repair B: Internal
Repair C: External
3 Once the FMM location has been determined go to the appropriate Repair section labeled,
A, B, or C.
Page
2(37)
Volvo Trucks North America
Service Program
Date
10.2014
Group
No.
Release
386
004
02
Required Parts
Quantity
Part Number
1
85143376
Description
Control Unit CNG Fuel Levels
Repair A
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.
Tank mounted FMM
1 Disconnect all cables from the negative (ground) battery terminals to prevent personal
injury from electrical shock and prevent damage to electrical components.
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Volvo Trucks North America
Service Program
Date
10.2014
Group
No.
Release
386
004
02
2 Turn the CNG fuel system off, follow procedures as outlined:
2a. Turn the Manual Fuel System valve (red knob) to Closed.
W3090943
1. CNG Fuel System Shut Off Valve
Note: This valve isolates the fuel system from the engine.
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4(37)
Volvo Trucks North America
Service Program
Date
10.2014
Group
No.
Release
386
004
02
2b. Open rear access door(s) on both tank(s) if applicable.
2c. Turn each tank valve OFF.
W3090944
W3090945
Note: This will isolate each fuel tank separately from the CNG fuel system.
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5(37)
Volvo Trucks North America
Service Program
Date
10.2014
Group
No.
Release
386
004
02
3 Remove the rear step tread from the tank identified as containing the FMM.
Note: Left frame rail mount shown, right side similar.
W3091719
1. Step tread
4 Remove the tank caps, tethers and top two housing screws.
W3090947
1. CNG fuel caps
2. Housing screws
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6(37)
Volvo Trucks North America
Service Program
Date
10.2014
Group
No.
Release
386
004
02
5 Remove the top cover from the tank including rear access door and tether.
W3090949
1. Fasteners
W3090950
W3090952
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Volvo Trucks North America
Service Program
Date
10.2014
6 Disconnect the FMM harnesses.
W3090953
1. FMM Harness Connector
2. FMM Harness Connector
7 Remove FMM.
W3090954
1. Fasteners
Group
No.
Release
386
004
02
Page
8(37)
Volvo Trucks North America
Service Program
Date
10.2014
8 Install new FMM
W3090954
1. Fasteners
9 Connect the FMM harnesses.
W3090953
1. FMM Harness Connector
2. FMM Harness Connector
Group
No.
Release
386
004
02
Page
9(37)
Volvo Trucks North America
Service Program
Date
10.2014
10 Install top cover.
W3090952
W3090950
W3090949
1. Fasteners
Group
No.
Release
386
004
02
Page
10(37)
Volvo Trucks North America
Service Program
Date
10.2014
11 Install cap tethers, caps and additional top two screws.
W3090947
1. CNG fuel caps
2. Housing screws
12 Install the step tread.
W3091719
1. Step tread
Group
No.
Release
386
004
02
Page
11(37)
Volvo Trucks North America
Service Program
Date
10.2014
13 Turn fuel system ON, follow procedures as outlined:
13a. Turn tank valve(s) on.
W3090944
W3090945
Group
No.
Release
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004
02
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Service Program
Date
10.2014
Group
No.
Release
386
- The world’s #1 fuel additive for both gasoline and diesel...
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- Cleans and lubricates the fuel system, including fuel...
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TSB/Document ID: SP 386-004
Replacement Service Bulletin Number:
MFR Communication Date: 2014-10-23
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ELECTRICAL SYSTEM:SOFTWARE
MFR Component System:
MFR Component Subsystem:
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