06 18-16

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06 18-16

@DETROIT.
Service Information Bulletin
SUBJECT

DATE

SPN 4364 (ACM) (GHG17)

June 2016

Additions, Revisions, or Updates
Publication Number/ Title
DDC-SVC-MAN-0191

Platform

Section Title

GHG17 DD

SPN 4364/FMI 17 -

Platform

GHG17

Change
Minor additions along with five new steps.

DiagnosticLink users: Please update the troubleshooting guides in DiagnosticLink with this newest version. To update the
tool troubleshooting guide, open DiagnosticLink and from the Help - Troubleshooting Guides menu, select the appropriate
troubleshooting manual, then click Update.

13400 Outer Drive, West, Detroit, Michigan 48239-4001
Telephone: 313-592-5000
www.demanddetroit.com

All information subject to change without notice.

06 18-16

Copyright© 2016 DETROIT DIESEL CORPORATION

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2 SPN 4364/FMI 17 - GHG 17

2

SPN 4364/FMI 17 - GHG17

SCR NOx Conversion Efficiency
Table 1.
SPN 4364/FMI 17
Description

This Code Sets When the Aftertreatment Control Module (ACM)
Detects Poor Selective Catalyst Reduction (SCR) NOx Conversion
Efficiency

Monitored Parameter

SCR Inlet NOx Sensor and SCR Outlet NOx Sensor

Typical Enabling Conditions

Diesel Exhaust Fluid (DEF) Dosing Enabled, 1000 to 2100 rpm, 15 to
100% Load

Monitor Sequence

None

Execution Frequency

Continuous When Enabling Conditions Met

Typical Duration

30 Minutes

Dash Lamps

MIL

Engine Reaction

None

Verification

Parked SCR Efficiency Test

Possible causes:
•
•
•
•
•
•

Contaminated DEF
Incorrect concentration of urea in the DEF
Biased NOx sensor
Excessive DEF build-up in the exhaust
Improper DPF maintenance
Over temp aftertreatment

NOTICE: DEF crystallization inside the SCR mixing chamber or around the dosing unit does not indicate a failed/
leaking DEF doser. Do not replace the DEF dosing unit unless directed.
NOTICE: It may require 30 minutes or longer for the outlet NOx sensor to turn on. Do not replace either sensor
unless directed to within the troubleshooting.

Check as follows:
1. Connect DiagnosticLink ®.
2. Tum the ignition ON (key ON, engine OFF).
3. Check for other fault codes. Are there any air management system fault codes present, such as Intake Throttle Valve
(ITV), Intake Manifold Pressure (IMP), Intake Air Temperature (IAT), or turbocharger?
a. Yes; diagnose the air management system fault codes first.
b. No; Go to step 4.
4. Are there any Exhaust Gas Recirculation (EGR) system fault codes present?
a. Yes; repair the EGR system fault codes first.
b. No; Go to step 6.
5. Are there any fuel system fault codes present?
a. Yes; diagnose the fuel system fault codes first.
b. No; Go to step 6.
6. Are there any other NOx sensor fault codes present?
a. Yes; diagnose the other NOx sensor fault codes first.
b. No; Go to step 7.

4

All information subject to change without notice.

Copyright© 2016 DETROIT DIESEL CORPORATION

06 18-16

06 18-16

WARNING: ENGINE EXHAUST

To avoid injury from inhaling engine exhaust, always operate the engine in a well-ventilated area.
Engine exhaust is toxic.

WARNING: HOT EXHAUST

During parked regeneration the exhaust gases will be extremely HOT and could cause a fire if
directed at combustible materials. The vehicle must be parked outside.

WARNING: PERSONAL INJURY

To avoid injury before starting and running the engine, ensure the vehicle is parked on a level
surface, parking brake is set, and the wheels are blocked.
7. Was another emission component related fault code repaired prior to this step?
a. Yes; warm up the engine and perform a Parked SCR Efficiency Test to verify repairs and clear fault codes.
Refer to section "GHG 17 Perform Parked SCR Efficiency Test".
b. No; Go to step 9.
8. Are there any ACM temperature or pressure fault codes present?
a. Yes; diagnose the fault first.
b. No; Go to step 9.
9. Tum the ignition OFF.
10. Use DEF test strip A0005850202 to check for diesel fuel or oil contamination of the DEF fluid. Refer to section
"Checking Diesel Exhaust Fluid Quality". Do the test strips or visual inspection indicate that the DEF is
contaminated?
a. Yes; for diesel fuel or oil contamination, refer to the following table for a list of parts that must be replaced.
Refill the DEF tank with new DEF. Verify repair; perform a Parked SCR Efficiency Test to clear the regulatory
fault. Refer to section "GHG 17 Perform Parked SCR Efficiency Test".
b. No; Go to step 11.
Table 2.
Parts to be replaced for diesel fuel or oil in the DEF system. Refer to the GHG17 DD Platform Workshop Manual
(DDC-SVC-MAN-0190) for proper repair procedures.
Part Description

Comment

DEF Tank

Chassis OEM Part

DEF Tank Header

Chassis OEM Part

DEF Supply Line From DEF Tank To DEF Pump

Chassis OEM Part

DEF Line From DEF Pump To DEF Dosing Unit

Chassis OEM Part

DEF Return Line From DEF Dosing Unit To Tank

Chassis OEM Part

DEF Pump

Detroit Diesel Part

DEF Dosing Unit

Detroit Diesel Part

11 . Using the refractometer from DEF Test Kit W060589001900, measure the DEF urea percentage. Is DEF urea
percentage between 31 and 34 percent?
a. Yes; Go to step 12.
b. No; drain and flush the DEF tank and the DEF system with water. Refill the DEF tank with new DEF. Verify
repair; perform a Parked SCR Efficiency Test to clear the regulatory fault. Refer to section "GHG 17 Perform
Parked SCR Efficiency Test".
12. Tum the ignition ON (key ON, engine OFF).

All information subject to change without notice.

06 18-16

Copyright© 2016 DETROIT DIESEL CORPORATION

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2 SPN 4364/FMI 17 - GHG 17

13. Inspect the area around the DEF dosing unit gasket for DEF crystallization. Is there any DEF crystallization build-up
present?
a. Yes; this indicates the gasket has failed, NOT the DEF dosing unit. Replace the gasket after completing the
DEF quantity test in the next step. Go to step 14.
b. No; Go to step 14.
14. Unbolt the DEF doser from the aftertreatment; do not disconnect the DEF lines or electrical connector.

d140642

Figure 1. Normal DEF Crystallization in the DEF Doser Port Hole
15. Find the graduated cylinder provided in DEF test kit W060589001900, which is used in DEF quantity tests; Refer to
section "Diesel Exhaust Fluid Quantity Test - GHG 17".
16. Perform a DEF Quantity Test service routine.
17. Monitor the amount of DEF dispensed. Is the amount of DEF dispensed between 108 and 132 mL (3.7 and 4.5 oz.)?
a. Yes; reinstall the DEF dosing unit.Use a new gasket and bolts, as they are one-time use. Refer to section
"Installation of the Diesel Exhaust Fluid Dosing Unit". Go to step 18.
b. No; replace the DEF dosing unit. Use a new gasket and bolts, as they are one-time use. Refer to section
"Installation of the Diesel Exhaust Fluid Dosing Unit ". Verify repair; perform a Parked SCR Efficiency Test to
clear the regulatory fault. Refer to section "GHG 17 Perform Parked SCR Efficiency Test".
18. Disconnect the DEF dosing unit electrical connector.

WARNING: ENGINE EXHAUST
To avoid injury from inhaling engine exhaust, always operate the engine in a well-ventilated area.
Engine exhaust is toxic.

WARNING: HOT EXHAUST
During parked regeneration the exhaust gases will be extremely HOT and could cause a fire if
directed at combustible materials. The vehicle must be parked outside.

6

All information subject to change without notice.

Copyright© 2016 DETROIT DIESEL CORPORATION

06 18-16

06 18-16

WARNING: PERSONAL INJURY
To avoid injury before starting and running the engine, ensure the vehicle is parked on a level
surface, parking brake is set, and the wheels are blocked.

NOTE: Running the engine with DEF Dosing Unit electronically disconnected will induce a DEF doser circuit fault
code. This code can be erased using Diagnosticlink™ once the DEF doser electrical connector is reconnected.
19. Start the engine and perform a complete parked regeneration. The regen will bum off any DEF deposits in the
aftertreatment before checking the NOx sensors.

NOTICE: It may require 30 minutes or longer for the outlet NOx sensor to turn on. Do not replace either sensor
unless directed within the troubleshooting.
20. Run the "Perform the GHG17 Perform Performance Check - Low Temperature ATD" to check for a drifted NOx
sensor. Refer to section "GHG 17 Perform Performance Check - Low Temperature ATD". Are the NOX sensor
readings within 50 Parts Per Million (PPM) of each other?
a. Yes; Go to step 22.
b. No; replace the outlet NOx sensor. Refer to section "Removal of the Selective Catalytic Reduction Outlet NOx
Sensor". Go to step 21.
21. Run the "GHG17 Perform Performance Check - Low Temperature ATD". Refer to section "GHG17 Perform
Performance Check - Low Temperature ATD". Are the inlet NOx sensor and outlet NOx sensor readings within 50
Parts Per Million (PPM) of each other?
a. Yes; Go to step 22.
b. No; replace the inlet NOx sensor. Refer to section "Removal of the Selective Catalytic Reduction Inlet NOx
Sensor". Go to step 22.
22. Reconnect the DEF dosing unit electrical connector.

WARNING: ENGINE EXHAUST
To avoid injury from inhaling engine exhaust, always operate the engine in a well-ventilated area.
Engine exhaust is toxic.

WARNING: HOT EXHAUST
During parked regeneration the exhaust gases will be extremely HOT and could cause a fire if
directed at combustible materials. The vehicle must be parked outside.

WARNING: PERSONAL INJURY
To avoid injury before starting and running the engine, ensure the vehicle is parked on a level
surface, parking brake is set, and the wheels are blocked.
23. Start the engine and perform a parked regeneration. Monitor the NOx conversion efficiency. Is the NOx conversion
efficiency above 85%?
a. Yes; this fault was likely caused by the DEF build-up in the exhaust which was cleared by the parked
regeneration procedures. Perform a Parked SCR Efficiency Test to clear the regulatory fault. Refer to section
"GHG17 Perform Parked SCR Efficiency Test".

NOTE: Excessive DEF build-up in the exhaust can be caused by a vehicle with a high speed, high average drive
load.

All information subject to change without notice.

06 18-16

Copyright© 2016 DETROIT DIESEL CORPORATION

7

2 SPN 4364/FMI 17 - GHG 17
b. No; Go to step 24.
24. Review the last seven minutes of the parked regeneration log data from step 23. The illustration below identifies the
last seven minutes of the parked regen.

(3 !j. (IIU.ff1•1tion)

LlAS119' °""'id• S<
E:]ASll'I: SCRF•uU
e~A£1121T- Al'tat-

J··-

s Ll Ptrcent1gC"
~ASl7'1: R.50111: SCRlnld T
&ljASOJ.!l:SCROutld
l':]ASl.28:SCR

~

9:]Vo~•9•
DASl»S: SCR lnlot T
~ - : SCR Oul«t

B~"
~AS.m i:cr_mon

e

06":':=d•

E:]ASIOO: SCR F•uU
~r)ppM
E]ASIB4: SCR NO< r1

EJAS03S: SCR Oulld
EJA50:J6: SCRlnld N
MAQ'l17-IC;lRNf"h.t...,.

•G;;;;i;;;;;;;;i

•

S..Kh SC~

d500301

25. Is the Selective Catalyst Reduction (SCR) inlet temperature lower than SCR outlet temperature by more than 38°C
(68.4°F)?
Example: SCR outlet temperature is 588°C (1090°F) - SCR Inlet Temp 398°C (749°F) = 171 °C (341 °F). Difference
between inlet and outlet is 171 °C (341 °F), which is greater than 38°C (68.4°F)?

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All information subject to change without notice.

Copyright© 2016 DETROIT DIESEL CORPORATION

06 18-16

06 18-16

I

I

NOx Conversion • 43%

SCR Outlet Temperature• 1090' F

d500302

a. Yes; Go to step 27.
b. No; for a 1-Box™ system, replace the DOC/SCR module. For a Two-Box system, replace the SCR module.
Complete the ATD checklist to identify cause of failure. Go to step 26.
26. Perform a Parked SCR Efficiency Test to clear the regulatory fault. Refer to section "GHG 17 Perform Parked SCR
Efficiency Test".
27. Review the data from the "Perform the GHG 17 Perform Performance Check - Low Temperature ATD" check in step
20. Is the calculated SCR inlet temperature and SCR outlet temperatures sensor readings within 25°C (45°F) at the end
of the low temp regen?
a. Yes; this indicates internal structural damage for a One-Box, replace the DOC/SCR module. The ATD checklist
is NOT required since the ATD is the primary failed part. This image below illustrates the possible internal
damage to the aftertreatment. Go to step 28.

All information subject to change without notice.

06 18-16

Copyright© 2016 DETROIT DIESEL CORPORATION

9

2 SPN 4364/FMI 17 - GHG 17

d500303

b. No; replace the drifted temperature sensor and verify repair. Go to step 28.
28. Perform a Parked SCR Efficiency Test to clear the fault. Refer to section "GHG 17 Perform Parked SCR Efficiency
Test".

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All information subject to change without notice.

Copyright© 2016 DETROIT DIESEL CORPORATION

06 18-16