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SUBJECT DATE

SPN 4364 (ACM) (EPA10;GHG14) July 2016

Additions, Revisions, or Updates

Publication Number / Title Platform Section Title Change

DDC-SVC-MAN-0084 DD Platform

SPN 4364/FMI 18 -GHG14

Updated diagnostics with additional graphics.SPN 4364/FMI 18 -

EPA10

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

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2 SPN 4364/FMI 18 GHG14

SCR NOx Conversion Efficiency Low

Table 1.SPN 4364/FMI 18

Description This Code Sets When the Aftertreatment Control Module (ACM)detects That the Selective Catalyst Reduction (SCR) NOxConversion Efficiency is Low

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 to100% Load

Monitor Sequence None

Execution Frequency Continuous When Enabling Conditions Met

Typical Duration 30 Minutes

Dash Lamps MIL

Engine Reaction None

Verification Parked Regeneration

Possible causes:

Contaminated DEF Incorrect concentration of urea in the DEF Biased NOx sensor Excessive DEF build-up inside the SCR mixing chamber Overtemp aftertreatment Improper DPF maintenance Internal structure failure of 1-Box

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.

Check as follows:

1. Connect DiagnosticLink .2. Turn 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 5.

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.

7. Was another emission component-related fault code repaired prior to this step?

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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 ifdirected 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 levelsurface, parking brake is set, and the wheels are blocked.

a. Yes; perform a parked regeneration to verify repairs and clear fault codes.b. No; Go to step 8.

8. Are there any ACM temperature or pressure fault codes present?a. Yes; diagnose those faults first.b. No; Go to step 9.

9. Turn 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 13 TS-17 (http://ddcsn-ddc.freightliner.com/cps/rde/xbcr/ddcsn/

13TS17.pdf) and refer to appropriate Original Equipment Manufacturer (OEM) literature for DEF tank cleaning/flushing procedures. Refill the DEF tank with new DEF. Verify repair.

b. No; Go to step 11.11. Using the refractometer from DEF Test Kit W060589001900, measure the DEF urea percentage. Refer to section

"Flushing of the Diesel Exhaust Fluid System". Is DEF urea percentage between 31 and 34 percent?a. Yes; Go to step 12.b. No; clean/flush the DEF tank and the DEF system. Refer to section "Flushing of the Diesel Exhaust Fluid

System". Refill the DEF tank with new DEF. Verify repair.12. Turn the ignition ON (key ON, engine OFF).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.

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http://ddcsn-ddc.freightliner.com/cps/rde/xbcr/ddcsn/13TS17.pdfhttp://ddcsn-ddc.freightliner.com/cps/rde/xbcr/ddcsn/13TS17.pdfhttp://ddcsn-ddc.freightliner.com/cps/rde/xbcr/ddcsn/13TS17.pdf

Figure 1. Normal DEF Crystallization In The DEF Doser Port Hole15. Use the graduated cylinder provided in DEF test kit W060589001900 and perform a DEF quantity test service routine;

Refer to section "Diesel Exhaust Fluid Quantity Test - GHG14".16. Monitor the amount of DEF dispensed into the DEF-safe container. Is the amount of DEF dispensed between 108 to

132 mL (3.7 to 4.5 oz.)?a. Yes; Go to step 17.b. No; replace the DEF dosing unit, using a new gasket and bolts, as these parts are one-time-use components. Refer

to section "Removal of the GHG14 Dosing System Doser". Verify repair.17. DEF crystallization buildup inside the SCR mixing chamber will cause poor NOx conversion efficiency. Use a scope to

see inside the DEF port for excessive DEF accumulation within the mixing chamber. Below are examples of normaland excessive amounts of DEF in the mixing chamber. Is there an excessive amount of DEF present in the mixingchamber?

a. Yes; Go to step 22.b. No; reinstall the DEF dosing unit, using a new gasket and bolts, as these parts are one-time-use components.

Refer to section "Installation of the GHG14 Dosing System Doser. Go to step 18.Below are examples of normal DEF crystallization inside the SCR mixing chamber.

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1. Looking inside SCR Mixing Chamber withDPF removed. Note: Doser Port Location

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1. Doser Port

Below are examples of excess DEF crystallization inside the SCR mixing chamber.

Table 2.

NOTICE: This can be seen by looking inside the mixing chamber through the DEF doser mounting port.

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1. Doser Port, restricted by solid mass ofcrystalized DEF.

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 ifdirected 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 levelsurface, parking brake is set, and the wheels are blocked.

18. Start and run a complete Parked Regeneration. Chart the following sensors; Inlet NOx Sensor, Outlet NOx Sensor andNOx Conversion Efficiency.

19. Review the whole parked regen from start to finish. Compare the regen data results to the graphic below. Go to step20.

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20. Above is an example of DEF accumulation inside the SCR mixing chamber. This failure is identified by a small spikein the outlet NOx reading. As the regeneration progresses and the excess amount of DEF burns off inside the SCRmixing chamber, the NOx conversion improves. Do the results from the parked regen look similar to the graphicabove?

a. Yes; Go to step 22.b. No; Go to step 21.

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21. Above is also an example of DEF accumulation inside the SCR mixing chamber. Once again, there is a spike in theoutlet NOx reading and NOx conversion efficiency drops. The only difference: there was good NOx conversion untilthe high temperature inside the aftertreatment started to burn off the built-up DEF, causing the sudden drop in NOxconversion efficiency. Do the results from the parked regen look similar to the graphic above?

a. Yes; Go to step 22.b. No; Go to step 23.

22. Vehicles with high load duty cycles are more prone to DEF buildup inside the SCR mixing chamber. Install a DEFawning to help eliminate this failure. Refer to section "GHG14 1-BOX Diesel Exhaust Fluid (DEF) Awning".Verify repair.

23. Disconnect the DEF dosing unit electrical connector.

NOTE: Running the engine with DEF doser unit electronically disconnected will induce a DEF doser circuit faultcode. This code can be erased using DiagnosticLink once the DEF doser electrical connector is reconnected.

24. Run the "GHG14 Perform Performance Check - Low Temp ATD". Let the routine run for 20 minutes. Refer to section"GHG14 Perform Performance Check - Low Temperature ATD". Are the NOx sensor readings within 50 Parts PerMillion (PPM) of each other?

a. Yes; Go to step 26.b. No; replace the outlet NOx sensor. Refer to section "Removal of the GHG14 Selective Catalyst Reduction

Outlet Temperature Sensor". Go to step 25.25. Run the "GHG14 Perform Performance Check - Low Temperature ATD". Refer to section "GHG14 Perform

Performance Check - Low Temperature ATD". Are the inlet and outlet NOx sensor readings within 50 Parts PerMillion (PPM) of each other?

a. Yes; Go to step 26.b. No; replace the inlet NOx sensor. Refer to section "Removal of the GHG14 Selective Catalytic Reduction Inlet

NOx Sensor". Go to step 26.26. 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 ifdirected 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 levelsurface, parking brake is set, and the wheels are blocked.

27. Start the engine and perform a parked regeneration and monitor the NOx efficiency. Is the NOx efficiency above85%?

a. Yes; diagnostics are completed. Release the vehicle.b. No; Go to step 28.

28. Review the last seven minutes of the parked regeneration log data. The illustration below identifies the last sevenminutes of the parked regen.

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29. Is the Selective Catalyst Reduction (SCR) inlet temperature lower than SCR outlet temperature by more than 38C(68.4F)?Example: SCR Outlet temp 1090F minus SCR Inlet Temp 749F = 241F. The difference between inlet and outlettemperature is 241F, which is greater than 68.4F.

a. Yes; Go to step 30.

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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. Refer to section "ATD Checklist - GHG14".

30. Review the data from the low temperature Aftertreatment Device (ATD) check in step 24 to check for a driftedtemperature sensor.

31. Are the SCR inlet and SCR outlet temperatures within 25C (45F) after the 20 minutes?a. Yes; for a 1-Box, replace the DOC/SCR module. This indicates internal structural damage; see image below.

The ATD checklist is NOT required since the ATD is the primary failed part.

b. No; replace the drifted SCR temperature sensor and verify repair.

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14 All information subject to change without notice.Copyright 2016 DETROIT DIESEL CORPORATION07 06-16

3 SPN 4364/FMI 18 - EPA10

Selective Catalyst Reduction NOx Conversion Low

Table 3.SPN 4364/FMI 18

Description This Fault Code Sets When the Aftertreatment Control Module(ACM) Detects that the NOx Conversion is Lower than a CalibratedThreshold

Monitored Parameter Selective Catalyst Reduction (SCR) Inlet NOx Sensor, SCR OutletNOx Sensor

Typical Enabling Conditions Diesel Exhaust Fluid (DEF) Dosing Enabled, 1000 to 1500 rpm, 15 to100% load, SCR Inlet Temperature Sensor less than 650C(1200F), Ambient Temperature Greater Than 0C (32F), CoolantTemperature Greater Than 70C (158F), Non-regenerationConditions Present

Monitor Sequence None

Execution Frequency Continuous When Enabling Conditions Met

Typical Duration 30 Minutes

Dash Lamps MIL

Engine Reaction Derate 25%

Verification Parked Regeneration

Check as follows:

1. Connect DiagnosticLink .2. Turn the ignition ON (key ON, engine OFF).3. Was another emission component-related fault code repaired prior to this step?

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 ifdirected 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 levelsurface, parking brake is set, and the wheels are blocked.

a. Yes; perform a parked regeneration and recheck for the fault code. If the fault code returns, Go to step 4.b. No; Go to step 4.

4. Check for other fault codes. Are there any air management system fault codes present for the Intake Throttle Valve(ITV), Intake Manifold Pressure (IMP), Intake Air Temperature (IAT), turbocharger, etc.?

a. Yes; diagnose the other fault codes first.b. No; Go to step 5.

5. Are there any Exhaust Gas Recirculation (EGR) system fault codes present?

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a. Yes; diagnose the other fault codes first.b. No; Go to step 6.

6. Are there any other NOx sensor fault codes present?a. Yes; diagnose the other fault codes first.b. No; Go to step 7.

7. Are there any fault codes for the DEF metering unit, DEF pump, or DEF air valve present?a. Yes; diagnose the other fault codes first.b. No; Go to step 8.

8. Are there any ACM temperature or pressure fault codes present?a. Yes; diagnose those fault codes first.b. No; Go to step 9.

9. Turn 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 13 TS-17 (http://ddcsn-ddc.freightliner.com/cps/rde/xbcr/ddcsn/

13TS17.pdf) and refer to appropriate Original Equipment Manufacturer (OEM) literature for DEF tank cleaning/flushing procedures. Refill the DEF tank with new DEF. Verify repair.

b. No; Go to step 11.11. Using a refractometer from the DEF Test Kit W060589001900, measure the DEF percentage. Refer to section

"Checking Diesel Exhaust Fluid Quality". Is DEF percentage between 28% and 36%?a. Yes; Go to step 12.b. No; flush the DEF system. Refer to section "Flushing of the Diesel Exhaust Fluid System". Verify repair.

12. Turn the ignition ON (key ON, engine OFF).13. Compare the DEF pressure sensor reading to the barometric pressure sensor reading. Are the readings within 4.3 psi of

each other?a. Yes; Go to step 14.b. No; replace the DEF pressure sensor. Refer to section "Removal of the Diesel Exhaust Fluid Pressure Sensor".

Verify repair.14. Perform the DEF quantity service routine. Refer to section "Diesel Exhaust Fluid Quantity Test - EPA10". Go to step

15.15. Monitor the amount of DEF dispensed into the DEF-safe container included in DEF test kit W060589001900. Is the

amount of DEF dispensed between 102 and 138 mL?a. Yes; Go to step 16.b. No; flush the DEF metering unit. Verify repair.

NOTE: SPN 3361/FMI 5 will set when the DEF dosing valve electrical connector is disconnected. The fault codecan be cleared using DiagnosticLink after the DEF dosing valve electrical connector is reconnected.

16. Disconnect the DEF dosing valve 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 ifdirected at combustible materials. The vehicle must be parked outside.

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http://ddcsn-ddc.freightliner.com/cps/rde/xbcr/ddcsn/13TS17.pdfhttp://ddcsn-ddc.freightliner.com/cps/rde/xbcr/ddcsn/13TS17.pdfhttp://ddcsn-ddc.freightliner.com/cps/rde/xbcr/ddcsn/13TS17.pdf

WARNING: PERSONAL INJURY

To avoid injury before starting and running the engine, ensure the vehicle is parked on a levelsurface, parking brake is set, and the wheels are blocked.

17. Start the engine.18. Run the EPA10 Perform Performance Check - Low Temperature ATD procedure to check the NOx sensors. Refer to

section "EPA10 Perform Performance Check - Low Temperature ATD". Are the inlet NOx sensor and the outlet NOxsensor readings within 50 Parts Per Million (PPM) of each other?

a. Yes; Go to step 20.b. No; replace the outlet NOx sensor. Go to step 19.

19. Run the EPA10 Perform Performance Check - Low Temperature ATD procedure to validate the NOx sensors arereading correctly. Refer to section "EPA10 Perform Performance Check - Low Temperature ATD". Are the inlet NOxsensor and outlet NOx sensor readings within 50 Parts Per Million (PPM) of each other?

a. Yes; Go to step 20.b. No; replace the inlet NOx sensor. Go to step 20.

20. Reconnect the DEF dosing valve 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 ifdirected 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 levelsurface, parking brake is set, and the wheels are blocked.

21. Start the engine and perform a parked regeneration while monitoring the NOx efficiency. Is the NOx efficiency above70%?

a. Yes; clear codes and release the vehicle.b. No; Go to step 22.

22. Review the last seven minutes of the parked regeneration log data; the illustration below identifies the last sevenminutes of the parked regen. Is the Selective Catalyst Reduction (SCR) inlet temperature lower than SCR outlettemperature by more than 38C (68.4F)?

a. Yes; Go to step 23.b. No, replace the ATD. 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. Refer to section "ATD Checklist -EPA07/EPA10".

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23. Perform a low temperature Aftertreatment Device (ATD) check using DiagnosticLink to check for a driftedtemperature sensor. Refer to section "EPA10 Perform Performance Check - Low Temperature ATD". Are the SCRinlet and SCR outlet temperatures within 25C (45F) during the last five minutes of this test?

a. Yes; for a 1-Box system, replace the DOC/SCR module. This indicates internal structural damage, see imagebelow. The ATD checklist is NOT required since the ATD is the primary failed part.

b. No; replace the drifted SCR temperature sensor and verify repair.

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1 07 06-162 SPN 4364/FMI 18 GHG143 SPN 4364/FMI 18 - EPA10