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,
and retest for SPN 2659 FMI 20(clear code
before retesting)

Decision
Yes: Continue to step 3
No: Repair as needed, clear the code, then
retest for SPN 2659 FMI 20.

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

Step Action
3
Visually inspect intake air system for leaks.
Were any leaks identified?

Decision
Yes: Repair leaks. After repairs are complete,
retest for SPN 2659 FMI 20.
No: Continue to Step 4

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IK1201245 ­ 2010+ DT/9/10 EGR Valve Diagnostics

Step Action
4
Perform EGR Operational Test 5 times.

Page 4 of 8

Decision
Yes: Replace the EGR Valve, clear the
code, then retest for SPN 2659 FMI 20

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 8

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: Replace the EGR Valve, clear the
code, then retest for SPN 2659 FMI 21/14/10.
No: Continue to Step 4

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IK1201245 ­ 2010+ DT/9/10 EGR Valve Diagnostics

Page 6 of 8

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

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: Go to step 5
No: Repair air intake system leaks. After
repairs are complete, clear the code, retest for
SPN 2659 FMI 21/14/10.

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 8

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 8

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

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