DSM.0015 Service Bulletin/Repair Instructions

Diagnostic Procedure

FC
SPN FMI
6849 6647
5
Blue iQ® Fault Code 6849
Title

Gaseous Fuel High Pressure Shutoff Valve - Current Below Normal or Open Circuit
Part(s) Affected
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).
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.

Perform Initial Vehicle Check procedure (refer to DSM.0009) prior to performing

diagnostic instructions listed below.
DSM.0015 Ver 3.0

August 18, 2022
Blue iQ® Fault Code 6849 Diagnostic Procedure

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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 3.0

August 18, 2022
Blue iQ® Fault Code 6849 Diagnostic Procedure

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SSV Circuit Diagram
Y40

SUPPLY

SOLENOID

VAVLE
C10

FUEL SYSTEM

CONTROL MODULE
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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 3.0

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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
pin
SSV

coil
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 range (below) for the SSV type is within operating

specifications.

Standalone Supply Solenoid Valve

(SSV) Resistance Ranges
Marathon Supply Solenoid Valve

(SSV) Resistance Ranges
Resistance within range?

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 3.0

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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 3.0

August 18, 2022
No

 Proceed to Step 6.
Blue iQ® Fault Code 6849 Diagnostic Procedure

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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 3.0

August 18, 2022
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.
+1 833 4 HEX CARE

(toll-free, U.S. and Canada)
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 3.0

August 18, 2022
3335 Susan Street, Suite 100 Costa Mesa, CA 92626 USA
Blue iQ® Fault Code 6849 Diagnostic Procedure

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www.hexagonagility.com
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DSM.0015 Ver 3.0

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Blue iQ® Fault Code 6849 Diagnostic Procedure

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