Detroit Diesel Service Information Bulletin

ADDITIONS, REVISIONS, OR UPDATES

NOTE: Page numbers are based on the most recent version of the individual publication and may be adjusted throughout the annual print cycle.

SPN 3363/FMI 0

This diagnostic is typically DEF tank temperature high.

Check as follows:

1. Connect DDDL/DDRS 7.04 SP4 or higher.
2. Turn the ignition ON (key ON, engine OFF).
3. NOTE: Perform Output Component Test, which can be run only once per key cycle.
4. Perform Output Component Test service routine. Does fault SPN 3363/FMI 3, 4, or 5 become active during the routine?
   • If Yes: Repair those faults first, clear codes and release vehicle.
   • If No: Proceed to step 4.
5. Using DDDL/DDRS, monitor parameter AS021 DEF Tank Temperature.
6. Remove the DEF tank filler cap. Using an external thermometer (e.g., infrared temperature gun), compare the actual DEF temperature (liquid) to the DDDL/DDRS reported tank temperature. Is the AS021 DEF Tank Temperature 49°C (120°F) higher than the externally measured temperature?
   • If Yes: Proceed to step 6.
   • If No: Proceed to step 7.
7. Disconnect the DEF Tank header harness connector, inspect connector harness for bent, spread or corroded pins.
   • If pin damage is found, repair as necessary.
   • If no pin damage is found, replace the DEF tank header assembly. Refer to the relevant section.
8. Disconnect the DEF Tank header harness connector, inspect connector harness for bent, spread or corroded pins.
   • If pin damage is found, repair as necessary.
   • If no pin damage is found, replace the DEF tank header assembly. Refer to the relevant section.

SPN 3363/FMI 1

This diagnostic is typically DEF tank temperature low.

Check as follows:

1. Are there any cooling system issues or complaints?
   • If Yes: Service cooling system issues or complaints.
   • If No: Proceed to step 2.
2. Connect DDDL/DDRS 7.04 SP4 or higher.
3. Turn the ignition ON (key ON, engine OFF).
4. NOTE: Perform Output Component Test, which can be run only once per key cycle.
5. Perform Output Component Test service routine. Does fault SPN 3363 FMI 3, 4, or 5 become active during the routine?
   • If Yes: Repair those faults first, clear codes and release vehicle.
   • If No: Proceed to step 5.
6. Using DDDL/DDRS, monitor parameter AS021 DEF Tank Temperature.
7. Remove the DEF tank filler cap. Using an external thermometer (e.g., infrared temperature gun), compare the actual DEF temperature (liquid) to the DDDL/DDRS reported tank temperature. Is the reported AS021 DEF Tank Temperature 10°C (50°F) lower than the externally measured temperature?
   • If Yes: Proceed to step 7.
   • If No: Proceed to step 8.
8. Disconnect the DEF Tank header temperature/level harness connector, inspect connector harness for bent, spread or corroded pins.
   • If pin damage is found, repair as necessary.
   • If no pin damage is found, replace the DEF Tank header assembly. Refer to the relevant section.
9. Disconnect the DEF Tank header coolant valve harness connector, inspect connector harness for bent, spread or corroded pins.
   • If pin damage is found, repair as necessary.
   • If no pin damage is found, replace the DEF tank header assembly. Refer to the relevant section.

Additional Service Information

Additional service information is available in Power Service Literature.

Detroit Diesel Corporation

13400 Outer Drive, West / Detroit, Michigan 48239-4001

Telephone: 313-592-5000

Website: www.detroitdiesel.com

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