Diagnostic Procedure
FC

SPN FMI

6947 8247

7

Blue iQ® Fault Code 6947

Title
Fuel Tank Receptacle Cover - Mechanical System Not Responding or Out of Adjustment

Part(s) Affected

Receptacle Cover 1 / Receptacle Cover 2 / Receptacle Cover 3 / Receptacle Cover 4 /
Receptacle Cover 5*
*Hexagon Agility® refers to these items as fuel fill door / fuel receptacle kill cap / fuel
receptacle dust cap depending upon cover type and configuration.

Diagnostic Overview
Fault Code 6947 triggers when an engine crank is attempted and the Blue iQ® Fuel System Control Module
(FSCM) detects one or more of the following conditions related to drive away protection (DAP) components:
a) fuel fill door open or damaged
b) dust cap not installed on a fuel receptacle
c) cap magnet missing
d) fuel receptacle kill cap not installed
e) damage to DAP circuit
Fault Code 9647 will trigger every time a crank is attempted due to the incorrect state of the DAP component.
Because multiple components are potentially responsible for FC 6947, consult vehicle-specific Drive Away
Protection Circuit Diagram for fuel receptacle configuration and follow corresponding Circuit / System
Verification steps below.
The Circuit / System Verification procedure below applies to standard FMMs
equipped with single or dual fuel fill receptacles. Please contact Hexagon Agility®
Technical Support to confirm the most recent documentation updates or for
assistance with differing DAP system configurations.

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.

Tools Required
Item

Purpose

J1939 OBD-II diagnostic interface

connect vehicle to Cummins® INSITE™ on PC

Cummins® INSITE™

diagnostic software

digital multimeter (DMM)

resistance and voltage measurements

test probe kit

properly test and back probe circuit terminals

Never probe an electrical connection with anything other than an appropriately
sized and shaped test lead; doing so may result in damage to components.

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Perform Initial Vehicle Check (refer to DSM.0009) prior to performing diagnostic
instructions listed below.

Circuit / System Verification
1. Connect Cummins® INSITE™ to vehicle using J1939 OBD-II diagnostic interface and PC 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. While removing and reinstalling each fuel door / fuel cap, simultaneously observe INSITE™ Fuel Tank
Receptacle Cover data for status change (OPEN or CLOSED) and record status.
a. If status does not change proceed to Circuit/System Testing on affected door or caps.
b. If status changes 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.
5. Verify that the fault code does not set. If any fault code sets proceed to Circuit/System Testing.
6. While observing the Fuel Tank Receptacle Cover parameters in INSITE™ perform a wiggle test on the
harness and connectors to test for poor or intermittent connections.
a. If any fault code sets, proceed to Circuit/System Testing.
b. If no fault code sets, system is functioning to design intent.
7. Review Circuit Diagrams and Connector End Views (both below) to locate test points.

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Circuit Diagram – Drive Away Protection (DAP) 1 and 2

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Circuit Diagram – Drive Away Protection (DAP) 3, 4, and 5

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Circuit / System Verification
Step
1

Is FMM fuel door / are all fuel receptacle kill cap(s) / fuel receptacle dust cap(s) properly installed?
Yes
 Proceed to Step 2.

No

 Close door / install cap(s).
 Operate vehicle to verify if fault code
returns.

Step
2

 Ignition Off.
 Disconnect reed switch harness connector.
 Use a DMM and appropriate test leads to check resistance across reed switch assembly connector
Pin A and Pin B.

Pin B – Black/White
wire

Pin A – Gray wire

Resistance between zero and 1 ohms?
Yes

 Proceed to Step 3.

No

 Replace door switch / reed switch
assembly.

 After repair is complete, proceed to
Reassembly and Validation.

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Step
3

 Ignition On.
 Open fuel door / remove fuel receptacle kill cap(s).

Pin A – Gray wire

reed switch harness connector end view

 Use a DMM to check for voltage at reed switch harness connector Pin A and known good ground.
Voltage between 4.8 V to 5.2 V?
Yes

 Contact Hexagon Agility® Technical
Support.

Step
4

No

 Proceed to Step 4.

 Ignition Off.
 Disconnect FSCM connector.
 Use a DMM and appropriate test leads to measure resistance between FSCM connector Pin 8 and
reed switch connector Pin A.
Pin 8 –
Gray wire

Pin A –
Gray
wire

reed switch connector
end view

FSCM harness connector end view

Resistance between zero and 1 ohms?
Yes

 Contact Hexagon Agility® Technical
Support.

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No
 Repair open / high resistance in harness
5V 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® Technical Support.

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.0018 Ver 1.0
July 20, 2021

3335 Susan Street, Suite 100 Costa Mesa, CA 92626 USA

Blue iQ® Fault Code 6947 Diagnostic Procedure
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www.hexagonagility.com

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