Did any SPN 27 fault codes become active?
No: Continue to Step 5

Step Action
5
Do MAF Calibration Procedure — Using ServiceMaxx™ software. Ensure MAF Calibration
Requirements are met and MAF calibration Pre­Checks are done, prior to doing this
procedure.
Did the MAF sensor calibration run successfully?

Step Action
6
Perform & Record Air Management Test.
MAF Mean Value Delta obtain the reading by subtracting the high reading in the beginning of
the test to the low reading near the end as shown below in Graph 1:

Decision
Yes: Continue to Step 6
No:Repair issue causing the failure. After
repair is complete, clear the code, and retest
for SPN 2659 FMI 20.

Decision
Yes: No further action required
No IMP: Go to step 7

1. 466 ST ≥ 690 mg
2. 466 HT ≥ 740 mg
3. 570 ≥ 850 mg
Intake Manifold Pressure (IMP) Graph 2:
No MAF Delta: Go to step 8
1. 2 - 6 PSI
Does Air Management test meet specifications listed above?

Graph 1

1. MAF Mean Value High Point
2. MAF Mean Value Low Point

Graph 2

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IK1201245 ­ 2010+ DT/9/10 EGR Valve Diagnostics

Page 5 of 9

1. Intake Manifold Pressure (IMP)

Step Action
7
Was Intake Manifold Pressure (IMP) above or below specification?

Decision
Above Specification: Follow Turbocharger
wastegate adjustment in IK1201103
Below Specification: : Follow
IK1200648 Low Power Complaint due to
Low Boost

Step Action
8
Remove the Engine Throttle Valve (ETV) from the EGR mixer housing and inspect for EGR
valve stuck open.
Do not remove the EGR valve unless it is stuck open more than 1/8”
Is EGR valve stuck open?

Decision
Yes: Replace and retest for SPN
No: After performing all diagnostic steps, if
SPN 2659 FMI 20 remains, verify if each step
was completed correctly and proper decision
was made. Notify supervisor for further action.

Diagnostic Steps when Fault 2659-21 or 2659-14 or 2659-10 is present
Step Action
1
Using Electronic Service Tool (EST) with ServiceMaxx™ software, check for other fault
codes.
Is SPN 2659 FMI 21/14/10 the only fault code active?

Step Action
2
Inspect connections at the Exhaust Gas Recirculation (EGR) valve. With key OFF,
disconnect EGR valve connector. Check EGR valve and connector for: damaged or pinched
wires; corroded terminals; loose, bent, or broken pins; or broken connector housing.

Decision
Yes: Continue to Step 2.
No: Correct any other active fault codes, then
retest for SPN 2659 FMI 21/14/10 (clear code
before retesting)

Decision
Yes: Continue to step 3
No: Repair as needed, clear the code, then
retest for SPN 2659 FMI 21/14/10.

Are the EGR Valve connector, harness, and terminals clean and undamaged?

Step Action
3
Do MAF Calibration Procedure — Using ServiceMaxx™ software. Ensure MAF Calibration
Requirements are met and MAF calibration Pre­Checks are done, prior to doing this
procedure.

Decision
Yes: Continue to Step 4
No: Repair air intake system leaks. After repairs
are complete, clear the code, retest for SPN

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IK1201245 ­ 2010+ DT/9/10 EGR Valve Diagnostics

Did the MAF sensor calibration run successfully?
Step Action
4
Perform EGR Operational Test 5 times.
Did any SPN 27 fault codes become active?

Page 6 of 9

2659 FMI 21/14/10. If code remains, continue to
step 4
Decision
Yes: Replace the EGR Valve, clear the
code, then retest for SPN 2659 FMI 21/14/10.
If code remains, continue to step 5.
No: Continue to Step 5

Step Action
5
Perform & Record Air Management Test.
MAF Mean Value Delta obtain the reading by subtracting the high reading in the beginning
of the test to the low reading near the end as shown below in Graph 1:
1. 466 ST ≥ 690 mg
2. 466 HT ≥ 740 mg
3. 570 ≥ 850 mg

Decision
Yes: No further action required

No IMP: Go to step 6

Intake Manifold Pressure (IMP) Graph 2:
1. 2 - 6 PSI
Does Air Management test meet specifications listed above?

No MAF Delta: Go to step 7

Graph 1

1. MAF Mean Value High Point (mg)
2. MAF Mean Value Low Point (mg)

Graph 2

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IK1201245 ­ 2010+ DT/9/10 EGR Valve Diagnostics

Page 7 of 9

1. Intake Manifold Pressure (IMP)
Step Action
6
Was Intake Manifold Pressure (IMP) above or below specification?

Decision
Above Specification: Follow Turbocharger
wastegate adjustment in IK1201103
Below Specification: : Follow IK1200648 Low
Power Complaint due to Low Boost

Step Action
7
Remove the Engine Throttle Valve (ETV) from the EGR mixer housing and inspect for 80%
or more plugging

Decision
Yes: Clean plugging as needed, do not
replace the EGR valve clean & replace O­
rings if needed.

Is a severe amount of plugging present in the EGR mixer housing?
No: Go to step 8

Step Action
8
Perform EGR Operational Test 5 times
Did any SPN 27 fault codes become active?

Step Action
9
Perform & Record Air Management Test
Does SPN 2659 FMI 21/14/10 become active?

Decision
Yes: Replace the EGR Valve, clear the code,
then retest for SPN 2659 FMI 21/14/10.
No: Go to step 9

Decision
Yes: Go to step 10

No: No further action required

Step Action
10
Remove rear EGR crossover pipe and inspect for plugging
Is the rear of the EGR cooler plugged?

Decision
Yes: Replace the EGR cooler, clear the
code, then retest for SPN 2659 FMI 21/14/10.
No: After performing all diagnostic steps, if fault
remains, verify if each step was completed
correctly and the proper decision was made.
Notify supervisor for further action.

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IK1201245 ­ 2010+ DT/9/10 EGR Valve Diagnostics

Page 8 of 9

Related article: IK1201120 for AMT diagnostic assistance
To the Top

PARTS
Part Number

Quantity
Required

1890997C92

1

Notes
VALVE ASSY EGR

*If diagnostics determine as neccessary

REPAIR PROCEDURE
See the Service Manual (direct link to EGRV) for EGR Valve installation and removal.
To the Top

WARRANTY INFORMATION
Special Requirements:
• PocketMaxx or EZ­Tech Health Report with Fault Codes is required for warranty reimbursement, per WPL13-009G.

EGR VALVE REPLACEMENT:
Warranty Claim Coding:
Group: 12000 - Engine
Noun:

893 - Valve, EGR

Standard Repair Times:
Time

SRT

Chassis Model

Engine Model

0.7

E12-6893T

HC BUS

MaxxForce DT/9/10

0.7

GY12-6893T

CE/BE

MaxxForce DT/9/10

1.8

I12-6893T

RE

MaxxForce DT/9/10

0.7

KL12-6893T

4300, 4400

MaxxForce DT/9/10

0.7

M12-6893T

7300, 7400, 7500

MaxxForce DT/9/10

To the Top

Hide Details

Feedback Information
Viewed:

4378

Helpful:

22

Not Helpful: 3

Staff
ID

Client
ID

Comments

Created
Date

DY27411

You received the following feedback From: DY27411 - Ryan Huck Email Address: [email protected] Job Classification: SE008, Service Technician Dealer: O'HALLORAN
INTERNATIONAL Feedback: I went through the diagnostics for a 2659 20 code on this iKnow document and I got to step 6 and ran an AMT. Everything checked out and the
decision says "no further action required." I test drove the truck 25miles and the code came back pending. Is there any further diagnostics that can be done?

5/8/2015
9:29:11 AM

DY36682

You received the following feedback From: dy36682 - John Snyder Email Address: [email protected] Job Classification: SE008, Service Technician
Dealer: CORNHUSKER INTL TRUCKS Feedback: So when the truck comes in with the check engine light on for code 2659­10 and there is a software update for the ecm which
one do you do first? The software update or diagnose the code?

5/15/2015
2:02:44 PM

DY28964

You received the following feedback From: dy28964 - Ryan Wake Email Address: [email protected] Job Classification: SE016, Service Apprentice Dealer:
LEWIS MOTOR SALES INC. Feedback: FOUND EGR LOW FLOW CODE IN UNIT WITH HEALTH REPORT. USED FCAP FOR FAULT CODE 2659-21. DID STEP BY STEP
DIAGNOSTICS. GOT TO STEP 5 AND CAME TO DECISION OF NO FURTHER ACTION REQUIRED BECAUSE ALL STEPS PASSED. I ALSO DID THE STEP BY STEP
DIAGNOSTICS AGAIN TO MAKE SURE EVERYTHING WAS RIGHT. UNIT STILL HAS COOLANT LOSS. NO EXTERNIAL LEAKS FOUND. I AM JUST GOING TO GO TO
STEP 10 AND PULL THE EGR CROSS OVER TUBE BECAUSE OF LOSSING COOLANT. I KNOW THIS LOW FLOW RATE IS A COMMON PROBLEM WITH EPA 2010
COOLERS. THANKS FOR TAKING THE TIME TO REVIEW THIS PROBLEM.

5/19/2015
11:45:45
AM

DYYJFBD

You received the following feedback From: dyyjfbd - Jeffrey BogatayJR Email Address: [email protected] Job Classification: SE008, Service Technician Dealer:
RUSH TRK CTR OF N OH Feedback: Step 3 has me perform a MAF cal, which passed but at step 5 IMP is below spec. The MAF cal holds engine RPM high enough that IMP
has time to respond even when the sensor is clogged but the AMT does not. After following this iknow article through the steps which directed me to IK1200648 where no issues
were found. The problem was identified by holding the engine at WOT no load and observing the IMP reading which did eventually meet perf spec. The problem we found was
that the IMP sensor was clogged solid which causes a severely delayed IMP reading. I also have a few other questions.. 1-why is the only SRT link tied to this article for EGR
valve diag? 2­How should we bill steps 1­6 that are not supported by SRT's? 3­How should we bill the checks that are made in the second iknow article that I was directed to

5/19/2015
1:42:24 PM

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IK1201245 ­ 2010+ DT/9/10 EGR Valve Diagnostics

Page 9 of 9

when the root cause was not found in any action plan related to the code that was present? 4-Should I have continued to engine system tests and inspections once these articles
did not identify the problem? Is there a test that should be completed to identify if boost readings are building too slowly but not setting an underboost related code, Or at least
that the ECM reading is showing slow response?

DY10686

You received the following feedback From: dy10686 - TIMOTHY SEILERN Email Address: [email protected] Job Classification: SE008, Service Technician
Dealer: LEWIS MOTOR SALES INC. Feedback: In IK1201245 for diagnosing 2791,2 we need to know set up info for this diag! It might seem like it should be obvious but we
should never assume. KOEO, actuator disconnected? Only step 1 has this type of info. Please look into this as the specs given here are not at all like the diag specs that are
given in the pin to pin diagnostics for 2791,2 in the Diag manual.

5/22/2015
8:11:27 AM

DYYMMG4

You received the following feedback From: dyymmg4 - Marc Andre Gagniere Email Address: [email protected] Job Classification: SE008, Service Technician
Dealer: GLOVER INT'L TRUCKS Feedback: Hello - Just going through the diagnostics on this article and found that there are a few confusing points. Step 2 & 3 mention to
measure certain pins of the egr valve harness to ground, with a breakout harness all the voltages are correct, without a harness the values show improper. I know this might be
small but it could be easily misinterpreted.

5/29/2015
3:35:12 PM

Copyright © 2015 Navistar, Inc.

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