IK0800520 ­ Ground Splice 6747 Causing Multiple Fault Codes

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IK0800520
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ELECTRICAL
SYSTEM

Created:

10/29/2015

English

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Author:

Charles
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Title : Ground Splice 6747 Causing Multiple Fault Codes
Applies To : N9 and N10 powered vehicles built prior to Sep 28, 2015

Change Log
Please refer to the change log text box below for recent changes to this article:
05/03/2016 ‐ Updated SRT group from 15080 Fuel Pump, to 15040 Fuel Filter / Heater to allow
proper coding to the Harness Noun 909.
04/12/2016 ‐ Updated SRT noun from fuse to harness.
02/19/2016 ‐ Added terminal / seal information for the fuel heater and fuel pump connectors
based on dealer feedback.
01/27/2016 ‐ Updated broken hyperlink.





Description
A ground side wiring issue can cause multiple fault codes and may also cause engine
performance issues. This document outlines the potential fault codes that could be
present, the wiring that may be the cause, and the repair for the condition.
This applies to vehicles built prior to September 28, 2015 with an N9/10 engine.

Symptom(s)
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Diagnostic Trouble Code(s) & Dashboard Indicator Light(s):
DTC/Light

Description

SPN 1761 FMI 19

DEFTL not detected on J1939

SPN 3216 FMI 19

NOxIN not detected on J1939

SPN 3226 FMI 19

NOxOUT not detected on J1939

SPN 4377 FMI 19

NH3 Sensor Module not detected on J1939

SPN 5742 FMI 19

DOC/DPF Temperature module not detect J1939

SPN 5743 FMI 19

SCR Temperature module not detect J1939

SPN 94 FMI 1

Fuel Delivery Pressure below Critical

SPN 651 FMI 14

Injector 1 Fuel quantity/timing error

SPN 1323 FMI 31

Misfire ‐ Cylinder 1

Customer Observations or Concerns:
• MIL
• AWL
• Poor Engine Performance

Special Tool(s) / Software
Tool Description

Tool Number Comments

Indenter or Confined Crimp Tool for Closed
Barrel Terminals

Instructions

*Obtain
Locally

Service Parts Information
Part Description

Part Number

Quantity
Required

Notes

1

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IK0800520 ­ Ground Splice 6747 Causing Multiple Fault Codes

Fuel Heater Terminal TXT126870129
with 6" Lead *If
or
equipped*
Terminal
2033819C1
Seal 2607907C1
TXT126870122
Fuel Pump Terminal or
with 6" Lead
Terminal
2590749C1
Closed barrel
butt connector

Heat shrink tubing

16 gauge wire
(white)

Obtain Locally

Obtain Locally

Obtain Locally

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Fuel Heater Lead (Part of Medium
Duty Electrical Harness Repair Kit
ITWX4048) *If equipped*

1

Fuel Pump Lead (Part of Medium
Duty Electrical Harness Repair Kit
ITWX4048)

2

Used as part of the repair for the
fuel pump / fuel heater wiring
change.

1

Used as part of the repair for the
fuel pump / fuel heater wiring
change.

6 Feet

Used as part of the repair for the
fuel pump / fuel heater wiring
change. (3 feet for fuel pump, 3 feet
for fuel heater)

4 Feet

Used as part of the repair for the
fuel pump / fuel heater wiring
change.
Use as needed to repair the 6747
connector

Split Loom

Obtain Locally

6747 Terminal
with 6" Lead

2506112C1

As
Needed

6747 Connector
Body

3543733C1

As
Use as needed to repair the 6747
Needed connector

6747 Connector
Body Lock

3543732C1

As
Use as needed to repair the 6747
Needed connector

6747 Bus Bar 3‐4
Way

3543736C1

As
Use as needed to repair the 6747
Needed connector

Diagnostic Step(s)
Inspect the 6747 connector, terminals, wires, and splice block cap for any damage. If no
damage is found, clean the terminals on the splice block cap gently with emery cloth. Even

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if no damage is found the repair steps should be followed if your N9 or N10 equipped
vehicle was built prior to September 28th, 2015.
• The 6747 Ground Splice Connector is located on the left side (driver side) of the
engine bay.
◦ Refer to Figure 1 and Figure 2
• Inspect the connector and ground splice for any damage
◦ Refer to Figure 3
Figure 1 ‐ 6747 Connector

Note: The 6747 may be located closer to the wiper bracket
depending on truck model and configuration. Verify circuit numbers
to ensure you are at the correct connector.
Figure 2 ‐ 6747 Connector

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IK0800520 ­ Ground Splice 6747 Causing Multiple Fault Codes

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Note: The 6747 may be located closer to the wiper bracket
depending on truck model and configuration. Verify circuit numbers
to ensure you are at the correct connector.
Figure 3 ‐ 6747 Splice Bus Bar

Note the damage to the connector and terminals

Repair Step(s)
Replace any damaged components on the 6747 connector using the parts listed above.
Move the fuel pump ground and fuel heater ground (if equipped) to an engine ground stud.
• Even if no damage is found at the 6747 connector the repair steps should be followed
if your N9 or N10 equipped vehicle was built prior to September 28th, 2015.
1. Unplug the fuel pump connector.
◦ Refer to Figure 4.
2. Remove terminal from Pin 1.

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3. Cut the wire back 1 inch from the molded foam.
4. Discard the terminal side.
5. Heat shrink the remaining side of the cut wire to protect the wire.
◦ The heat shrink should extend off the wire to seal and protect.
6. Install a new terminal TXT126870122 in the connector body.
7. Crimp the newly installed fuel pump wire to a 3 foot piece of 14 gauge white wire.
Solder and heat shrink the splice.
8. Route the wire along the harness towards the engine block ground stud.
◦ Refer to Figure 5 and Figure 6.
9. Install a 3/8 inch eyelet on the white wire at the ground stud.
10. Unplug the fuel heater connector (if equipped).
◦ Refer to Figure 4.
11. Cut the wire back 1 inch from the molded foam.
12. Discard the terminal side.
13. Heat shrink the remaining side of the cut wire to protect the wire.
◦ The heat shrink should extend off the wire to seal and protect.
14. Install a new terminal TXT126870129 in the connector body.
15. Crimp the newly installed fuel heater wire to a 3 foot piece of 14 gauge white wire.
Solder and heat shrink the splice.
16. Route the wire along the harness towards the engine block ground stud.
◦ Refer to Figure 5 and Figure 6.
17. Install a 3/8 inch eyelet on the white wire at the ground stud.
18. Install split loom around the ground wires and secure properly.
Figure 4 ‐ Fuel Pump / Filter Assembly

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Note: Items removed for clarity
Figure 5 ‐ Engine Block Ground Stud

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Ground Stud is located on the left side (driver side) of the engine
block, just under the ECM.
Figure 6 ‐ Engine Block Ground Stud

Note: Items removed for clarity.

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Warranty Information
Warranty Claim Coding:
Group: 15040 ‐ Fuel Filter / Heater
Noun: 909 ‐ Harness
Standard Repair Time(s):
SRT Description

Service Repair Time
Procedure

SRT Hours

A08‐2001A
A08‐2002A
Wiring Repair(s), Perform

A08‐2003A (All Models) Click Here
A08‐2004A
A08‐2005A

Other Resources
Figure 7 ‐ 6747 Connector

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IK0800520 ­ Ground Splice 6747 Causing Multiple Fault Codes

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6747 Pin Out
Master Service Information Site
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