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06 06-17

SUBJECT

DATE

SPN 3226 (ACM) (GHG17)

June 2017

Additions, Revisions, or Updates
Publication Number / Title

DDC-SVC-MAN-0193

Platform

GHG17
DD5

Section Title
SPN 3226/FMI 20 GHG17
SPN 3226/FMI 21 GHG17

Change

Several steps deleted with new section references added.

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.

All information subject to change without notice.

06 06-17

Copyright © 2017 DETROIT DIESEL CORPORATION

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2 SPN 3226/FMI 20 - GHG17

2

SPN 3226/FMI 20 - GHG17

Selective Catalyst Reduction Outlet NOx Sensor - Drift Low
Table 1.
SPN 3226/FMI 20
Description

Selective Catalyst Reduction (SCR) Outlet NOx Sensor - Drift Low

Monitored Parameter

Engine Out NOx

Typical Enabling Conditions

The Following Must Be True for Greater than 30s: Fuel Mass is 0,
Diesel Particulate Filter (DPF) Outlet Temperature Greater than
200C° (392F°), Battery Voltage Greater than 10V DC, Engine Speed
500 to 2100 rpm

Monitor Sequence

None

Execution Frequency

Always Enabled

Typical Duration

Five Seconds

Dash Lamps

MIL

Engine Reaction

None

Verification

Parked Regeneration

Check as follows:
1. Connect DiagnosticLink ®.
2. Turn the ignition ON (key ON, engine OFF).
3. Check for multiple fault codes. Are there any other fault codes present for the SCR outlet NOx sensor?
a. Yes; diagnose the other fault codes first.
b. No; Go to step 4.
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.
4. Inspect the Aftertreatment System (ATS) for exhaust leaks. Are there any leaks present?
a. Yes; repair the exhaust leaks. Verify repair.
b. No; Go to step 5.
5. Inspect the ATS for damage. Is there any damage present?
a. Yes; repair as necessary.
b. No; replace the SCR outlet NOx sensor. Refer to section "Removal of the Selective Catalytic Reduction Outlet
NOx Sensor". Verify repair.

4

All information subject to change without notice.

Copyright © 2017 DETROIT DIESEL CORPORATION 06 06-17

06 06-17

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SPN 3226/FMI 21 - GHG17

NOx Outlet Sensor Drift High
Table 2.
SPN 3226/FMI 21
Description

NOx Outlet Sensor Drift High

Monitored Parameter

Selective Catalyst Reduction (SCR) Outlet NOx

Typical Enabling Conditions

Coolant Temperature Greater than 70°C (158 °F), Engine rpm
Greater than 1500 and Torque Greater than 80%

Monitor Sequence

None

Execution Frequency

Continuous When Enabling Conditions Met

Typical Duration

20 seconds

Dash Lamps

MIL

Engine Reaction

None

Verification

Parked Regeneration

Check as follows:
1. Check Aftertreatment System (ATS) for visible exhaust leaks or damage. Is damage present?
a. Yes; repair as necessary.
b. No; Go to step 2.
2. Turn the ignition OFF.
3. 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?
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.
a. Yes; for diesel fuel or oil contamination, refer to 13 TS-17 (https://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 4.
4. Using the refractometer from DEF Test Kit W060589001900, measure the DEF urea percentage. Is DEF urea
percentage between 31 to 34 percent?
a. Yes; Go to step 5.
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
NOTE: Fault code SPN 3361/FMI 5 will become present when the Diesel Exhaust Fluid (DEF) doser electrical
connector is disconnected. This code can be cleared using DiagnosticLink once the DEF doser electrical
connector is reconnected.
5. Perform a DEF Quantity Test service routine; Refer to section "Diesel Exhaust Fluid Quantity Test - GHG17".
6. Monitor the amount of DEF dispensed into the DEF-safe container included in DEF test kit W060589001900. Is the
amount of DEF dispensed between 108 to 132 mL?
a. Yes; 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 Diesel Exhaust Fluid Dosing Unit". Go to step 7.
b. No; replace the DEF Dosing Unit using a new gasket and bolts, as these parts are one-time-use components.
Refer to section "Installation of the Diesel Exhaust Fluid Dosing Unit". Verify repair.
All information subject to change without notice.

06 06-17

Copyright © 2017 DETROIT DIESEL CORPORATION

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3 SPN 3226/FMI 21 - GHG17
7. Replace the SCR Outlet NOx sensor. Refer to section "Removal of the Selective Catalytic Reduction Outlet NOx
Sensor". Verify repair.

6

All information subject to change without notice.

Copyright © 2017 DETROIT DIESEL CORPORATION 06 06-17