IK1500109 Service Bulletin/Repair Instructions

Countries:
CANADA, UNITED STATES Document ID: IK1500109
Availability:
ISIS, FleetISIS, NotSIR
Revision:
2
Major System:
Fuel system
Created:
1/27/2025
Current Language: English
Last Modified: 2/20/2026
Other Languages: NONE
Author:
Viewed:
Brandon Heisler
8008

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Title : Supplemental 2017 A26 Fuel System Diagnostics

Applies To : 2017 A26 ESN 4500000 - 4599999
CHANGE LOG

Please refer to the change log text box below for recent changes to this article:

02/20/2026 - Fixed multiple broken manual links.

08/15/2025 - Correction to broken link to step 13.

02/17/2025 - Initial Article Release
DESCRIPTION

This document will guide the user through supplemental fuel system diagnostics on 2017 A26 ESN 4500000 - 4599999.
SYMPTOM(s)

NOTE: Clicking on the symptoms below should take you to the applicable diagnostics for that symptom within

this article.

Hard start

No start

Aftertreatment fuel diagnostics completed without resolution

Multiple misfire fault diagnostics completed without resolution

Multiple single-cylinder fault diagnostics completed without resolution

For loss of prime diagnostics, see IK1500108
Diagnostic Trouble Code(s) & Dashboard Indicator Light(s):

DTC/Light

SPN 157 FMI 0

SPN 157 FMI 1
Description

Engine Fuel 1 Injector Metering Rail 1 Pressure: Data Valid But Above

Normal Operational Range - Most Severe Level

Engine Fuel 1 Injector Metering Rail 1 Pressure: Data Valid But Below

Normal Operational Range - Most Severe Level
SPN 157 FMI 10

SPN 157 FMI 16

SPN 157 FMI 18

SPN 5585 FMI 1

SPN 6653 FMI 16

SPN 6653 FMI 18

SPN 1322 FMI 31

SPN 3480 FMI 17

SPN 3482 FMI 2

SPN 3482 FMI 7

SPN 3482 FMI 16
Engine Fuel 1 Injector Metering Rail 1 Pressure: Abnormal Rate of Change

Engine Fuel 1 Injector Metering Rail 1 Pressure: Data Valid But Above

Normal Operating Range - Moderately Severe Level

Engine Fuel 1 Injector Metering Rail 1 Pressure: Data Valid But Below

Normal Operating Range - Moderately Severe Level

Engine Fuel 1 Injector Metering Rail 1 Cranking Pressure: Data Valid But

Below Normal Operational Range - Most Severe Level

Engine Fuel 1 Injector Metering Rail 1 Cold Start Pressure: Data Valid But

Above Normal Operating Range - Moderately Severe Level

Engine Fuel 1 Injector Metering Rail 1 Cold Start Pressure: Data Valid But

Below Normal Operating Range - Moderately Severe Level

Engine Misfire for Multiple Cylinders: Condition Exists

Aftertreatment 1 Fuel Pressure 1: Data Valid But Below Normal Operating

Range - Lease Severe Level

Aftertreatment 1 Fuel Enable Actuator: Data Erratic, Intermittent, Or

Incorrect

Aftertreatment 1 Fuel Enable Actuator: Mechanical System Not Responding

Or Out Of Adjustment

Aftertreatment 1 Fuel Enable Actuator: Data Valid But Above NOrmal

Operating Range - Most Severe Level
Customer Observations or Concerns:

MIL

Low Performance

Misfire

Rough Running

Noise From the High-Pressure Fuel Pump
SPECIAL TOOL(s) / SOFTWARE

Tools Resource Center
SERVICE PARTS INFORMATION

Please review the applicable service information within the engine service manuals for repairs.

2017 A26 Service Manual
DIAGNOSTIC STEP(s)
HARD START/NO START, MULTIPLE CYLINDER MISFIRES, ROUGH RUNNING

NOTE: This article is intended to assist with fueling-related issues. Base diagnostics should be

completed before moving onto supplemental steps like those provided here. Airflow-related failures

can also cause hard start/no start, multiple cylinder misfires, and rough running complaints.

Step
#1
Confirm base diagnostics have been completed.
Decision
Review FCAP and operational checkout procedures:
Yes.
Did the applicable FCAP or operational checkout procedure identify a repair

path?
Follow the repair path established by

the published diagnostics.
NOTE: Published diagnostics and operational checkout procedures

should be followed before proceeding to step 2. If the fuel system

operational checkout procedure, or starting system operational checkout

procedure has not been performed, please perform them at this time. If

you've followed them, but they are leading you in a circle, proceed to the

next step.

No.

2017 A26 Fuel System Operational Checkout Procedure

2017 A26 Engine Does Not Start Operational Checkout Procedure

Proceed to step 2.

2017 A26 Engine Hard to Start Operational Checkout Procedure

2017 A26 Engine Performance Problem Operational Checkout Procedure

2017 A26 Misfire / Rough Idle / Runs Rough
Step

#2
Base diagnostic follow-on

Confirm the base diagnostics are not leading you in a circle, between

SPN 157 FMI 1 and 3.1 Engine Hard to Start (Long Crank Time):
Decision

Yes.
Proceed to step 6 of the SPN 157 FMI 1

diagnostic package. If the procedure

does not lead to a repair path, proceed

NOTE: Step 5 of 157-1 leads you to the 3.1 checkout procedure, and then to step 3 of this article.

3.1 checkout procedure leads you back to 157-1, and so on.

Is 157-1 and the checkout procedure leading you in a circle from step 5?
No.

Proceed to step 3.
Step
Confirm the fuel is in good condition.

Pull a fuel sample in a clear and clean container. Allow the sample to sit

for 1 hour. Proceed to step 3 while waiting for the sample to sit:
Decision

Yes.

Proceed to step 4.
Is the fuel in good condition, free from separation, cloudiness, gelling, or

waxing?

NOTE: IK1201406 A26 and S13 Fuel Gelling can be referenced for

inspections.
#3
Step

#4
No.

Fuel contamination was found and the

engine does not start, misfires, and/or

runs rough. Replace the following fuel

system components: fuel injectors,

high-pressure fuel pump, high-pressure

fuel rail, high-pressure fuel system

pipes and lines, primary and secondary

fuel filters, and flush low-pressure fuel

lines and fuel tank. If equipped, replace

the fuel heater. After repairs are

complete, retest for fault code.
Determine when the issue started.

Interview the customer/driver asking when the issue started:
Decision

Yes.
Did the issue start after performing a PM service, or other fuel system-related

repairs?
Ensure all repairs were performed

properly. If the secondary fuel filter was

replaced, confirm the standpipe is still

NOTE: If the International part number fuel filter is not used, the filter can in place and not damaged, and the

be shorter and can cause starting and running issues. Be sure to validate correct International part numbers were

the fuel filter part number used is the correct International part number.

used. Perform the priming procedure

using the priming tool and then re-test

for your symptom.

Note: If the issue persists, proceed to

step 5.

2017 A26 Priming Procedure
No.

Proceed to step 5.
Step
Verify your symptom aligns with this article.
Decision
Prime the fuel system using the priming tool. Start the unit to confirm it is Yes, the unit starts and runs

operating/starting properly after primed. If it starts and runs properly,

properly.

allow the unit to cold soak for 12 hours, and then re-test:

Re-test for the symptom. If needed,

Did the unit start and run properly after using the priming tool, and did it start

allow the unit to sit longer and re-test to

and run properly after sitting for 12 hours?

confirm.

2017 A26 Priming Procedure

No, the unit did not start properly

and/or run after using the priming

tool.
#5
Proceed to step 6.
No, the unit started after priming but

did not start after sitting.

Follow diagnostics from IK1500105
Step
Confirm fuel filter part numbers.
Decision
Validate the fuel filter part numbers are correct, filters in good condition, Yes.

and the standpipe is in place. Remove the standpipe and inspect for

damage, such as cracks or pinholes. Turn the standpipe upside down and Proceed to step 7.

fill it with fuel to check for leaks/pin-holes:

Are the fuel filters in good condition, correct OEM filter part numbers, and the

standpipe in place with no damage or leaks found?
#6
Step

#7
No.

NOTE: While the filter is removed, ensure we are inspecting the filter

bowls for debris. Wipe the bowl out with a clean white terry cloth or paper Install the correct OEM filter part

number and/or replace the standpipe as

towel to check for debris/metal, and take note of the results for the next

needed. Once repairs are complete, restep.

test for your issue. If the issue persists,

NOTE: If the International part number fuel filter is not used, the filter can proceed to step 7.

be shorter and can cause starting and running issues. Be sure to validate

the fuel filter part number used is the correct International part number.
Inspect for debris/metal.

Insect the filter bowls for debris/metal. Wipe the bowl with a clean

white terry cloth or paper towel.

Drag the fuel tanks with a clean magnet.

Remove EFA1 and inspect for debris:
Decision

Yes, debris was found on EFA1.

Replace the high-pressure fuel pump,

all 6 injectors, rail, filters, and highpressure lines. Clean and flush the lowpressure lines, return lines, and fuel

tanks, as well as clean the filter bowls.
Was any debris found in the filter bowls, tanks, or EFA1?

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