NHTSA ID Number: 10200284
Manufacturer Communication Number: DSM.0015
TSB/Document Date: 2021-08-09
Summary
Blue iQ® Fault Code 6849 Diagnostic Procedure. Fault Code 6849 is triggered when the Blue iQ® Fuel System Control Module (FSCM) detects SSV power is open circuit (less than 0.3 A current flow).
Diagnostic Procedure
FC
SPN FMI
6849 6647
5
Part(s) Affected
Blue iQ® Fault Code 6849
Title
Gaseous Fuel High Pressure Shutoff Valve - Current Below Normal or Open Circuit
supply solenoid valve (SSV)
Diagnostic Overview
Fault Code 6849 is triggered when the Blue iQ® Fuel System Control Module (FSCM) detects SSV power is
open circuit (less than 0.3 A current flow).
The integrated SSV coil used on the Hexagon Agility® Marathon extended range
pressure regulator possesses a different resistance at temperature range than the
standalone SSV coil used on standard pressure regulators.
Before proceeding with this procedure, please contact Hexagon Agility® Technical
Support for a resistance at temperature chart for the integrated SSV coil.
Warning Statements Used in this Procedure
NOTICE is used to address practices not related to physical injury, such as best
practices or tips to help an operation or procedure go smoothly and prevent equipment
damage.
WARNING indicates a hazardous situation which, if not avoided, could result in death
or serious injury.
Tools Required
Item
Purpose
digital multimeter (DMM)
resistance and voltage measurements
J1939 OBD-II diagnostic interface
connect vehicle to Cummins
® INSITE™ on PC
Cummins® INSITE™
diagnostic software
test lead kit
properly test and back probe circuit terminals and connectors
infrared non-contact thermometer
accurately measure SSV coil temperature
Never probe an electrical connection with anything other than a properly sized
and shaped test lead; doing so may result in damage to terminals.
DSM.0015 Ver 1.0
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Blue iQ® Fault Code 6849 Diagnostic Procedure
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Perform Initial Vehicle Check procedure (refer to DSM.0009) prior to performing
diagnostic instructions listed below.
Circuit / System Verification
1. Connect Cummins® INSITE™ diagnostic tool to vehicle using J1939 OBD-II diagnostic interface and navigate to
the “Agility® Fuel Delivery System, CM1881 AFS [18]”.
2. Record all active and stored fault codes and parameters prior to clearing fault codes using INSITE™.
3. Observe and record Gaseous Fuel High Pressure Shutoff Valve data from INSITE™—is data within reasonable
operating range?
a. If not within range proceed to Circuit/System Testing.
b. If within range proceed to Step 4.
4. Operate the vehicle in the same conditions for enabling the fault code or within the same conditions that triggered
the fault code based on recorded data.
a. If no fault codes set, proceed to Step 6.
b. If any fault code sets proceed to Circuit/System Testing.
5. While observing the Gaseous Fuel High Pressure Shutoff Valve parameters in INSITE™ perform a wiggle test
on supply solenoid valve (SSV) and FSCM connectors and harness to test for poor or intermittent connections.
a. If any fault code sets, repeat wiggle testing to determine which terminal is at fault and repair.
b. If no fault code sets, system is functioning to design intent.
6. Review Circuit Schematic and Connector End Views (below) to locate test points.
DSM.0015 Ver 1.0
July 20, 2021
Blue iQ® Fault Code 6849 Diagnostic Procedure
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SSV Circuit Diagram
Y40
SUPPLY
SOLENOID
VAVLE
C10
FUEL SYSTEM
CONTROL MODULE
DSM.0015 Ver 1.0
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Circuit / System Testing
Step
1
Ignition On, Engine On.
Use a DMM and a properly sized and shaped test lead to back probe voltage from supply solenoid
valve (SSV) harness connector Pin A (Pink wire) to Pin B (Black wire).
SSV voltage is pulse width modulated by the FSCM. Voltage reading
must be taken within 60 seconds of engine start to match actual battery
voltage.
Black wire
Pink wire
SSV harness connector end
Voltage equal to battery voltage? (NOTE: should be 12.2V or 24.4 V depending on system type.)
Yes
Proceed to Step 2.
Step
2
No
Proceed to Step 4.
Use a non-contact infrared thermometer to measure SSV coil temperature.
Record temperature.
Proceed to Step 3.
DSM.0015 Ver 1.0
July 20, 2021
Blue iQ® Fault Code 6849 Diagnostic Procedure
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Step
3
Ignition Off.
Disconnect SSV harness connector.
Use a DMM with appropriate test leads measure resistance across SSV coil connector pins.
SSV
coil
coil
connector
Marathon
pressure
regulator
coil
connector
Standalone SSV
(used with standard
pressure regulator)
pin
SSV
coil
pin
Extended range pressure regulator with integrated SSV
SSV coil connector
end view
Record the ohms reading.
Refer to the appropriate 12V or 24V SSV coil resistance table (below) to confirm whether ohms at
temperature values are within operating specifications.
Coil resistance values below are only to be used for standalone SSV coil
diagnosis. Please contact Hexagon Agility® Technical Support for
Marathon extended range pressure regulator integrated SSV coil
resistance at temperature values.
DSM.0015 Ver 1.0
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Standalone 12V Supply Solenoid Valve (SSV) Resistance at Temperature Chart
Standalone 24V Supply Solenoid Valve (SSV) Resistance at Temperature Chart
Resistance within range per above specifications?
Yes
Proceed to Step 4.
No
Replace supply solenoid valve (SSV) coil.
Follow OEM instructions
to replace SSV coil.
After repair is complete, proceed to
Reassembly and Validation.
DSM.0015 Ver 1.0
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Step
4
Ignition On.
Use a DMM and appropriate test leads to measure voltage from SSV Pin A to a known ground.
Pink wire
SSV harness connector end
Voltage equal to battery voltage? (NOTE: should be 12.2 V or 24.4 V depending on system type.)
Yes
Proceed to Step 5.
Step
5
No
Proceed to Step 7.
Ignition On.
Use a DMM and appropriate test leads to measure voltage from SSV connector Pin B to a known
ground.
Black wire
SSV harness connector end
Voltage equal to approximately zero V?
Yes
FSCM issue indicated.
Contact Hexagon Agility® Technical
Support.
DSM.0015 Ver 1.0
July 20, 2021
No
Proceed to Step 6.
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Step
6
Ignition Off.
Disconnect FSCM Blue iQ harness connector and SSV harness connector.
Use a DMM and appropriate test leads to measure resistance from FSCM harness connector Cavity
20 to SSV connector Cavity B.
Cavity 20
1
15
16
30
31
45
46
60
Cavity
B
SSV harness
connector end
FSCM connector end view
Resistance between zero to 1 ohms?
Yes
FSCM issue indicated.
Contact Hexagon Agility® Technical
Support.
Step
7
No
Repair SSV Return circuit.
After repair is complete, proceed to
Reassembly and Validation.
Ignition Off.
Disconnect FSCM Blue iQ harness connector and SSV harness connector.
Use a DMM and appropriate test leads to measure resistance from FSCM harness connector Cavity
53 to SSV connector Cavity A.
1
15
16
30
31
45
46
60
FSCM connector end view
Cavity
A
SSV harness
connector end
Cavity 53
Resistance between zero and 1 ohms?
Yes
FSCM issue indicated.
Contact Hexagon Agility® Technical
Support.
DSM.0015 Ver 1.0
July 20, 2021
No
Repair SSV Supply circuit.
After repair is complete, proceed to
Reassembly and Validation.
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Reassembly and Validation
After completing all repairs, always perform the following steps to confirm the issue is fixed:
1. Reconnect all connectors and verify connections are secure.
2. Reattach any enclosure covers and close any fuel system doors.
3. Clear fault codes using Cummins® INSITE™ tool.
4. Run vehicle until it reaches normal operating temperature. Refer to OEM instructions.
5. If fault is cleared, return vehicle to duty.
If fault is not cleared, contact Hexagon Agility® Customer Care and Technical Services.
Hexagon Agility® Customer Care and Technical Services
Fuel system warranty or non-warranty product support may be obtained by calling or emailing Hexagon Agility® Customer
Care and Technical Services (CCTS).
Please provide your name, phone number, email address, and complete vehicle information: VIN, year, make, model,
mileage, unit number vehicle owner, and current vehicle location. A service advisor will contact you to arrange vehicle
repair or ship a part.
+1 855 500 2445
(toll-free, U.S. and Canada)
+1 949 267 7745
Support
[email protected]
Parts Orders
[email protected]
Proprietary Statement
The information provided within this document is proprietary and confidential. All prior versions, including updates and revisions forwarded separately, are
proprietary. The information provided by Hexagon Agility® to its customers and clients is solely for the use of those customers and clients. No portion of
this publication may be reproduced or distributed without express written consent of Hexagon Agility®. Hexagon Agility® reserves the right to utilize the
intellectual property contained within this publication as content for any other publication produced by Hexagon Agility®.
Trademark Notice
Hexagon® is a registered trademark of Hexagon Technology AS. Agility® is a registered trademark of Agility Fuel Solutions LLC. Trademarks of other
manufacturers are the property of their respective companies.
Hexagon Agility®
DSM.0015 Ver 1.0
July 20, 2021
3335 Susan Street, Suite 100 Costa Mesa, CA 92626 USA
Blue iQ® Fault Code 6849 Diagnostic Procedure
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TSB/Document ID: DSM.0015
Replacement Service Bulletin Number:
MFR Communication Date: 2021-07-20
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: FUEL/PROPULSION SYSTEM
MFR Component System:
MFR Component Subsystem:
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