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SUBJECT DATE
SPN 4335/FMI 7 - EPA10 February 2014
Additions, Revisions, or Updates
Publication Number / Title Platform Section Title Change
DDC-SVC-MAN-0084 DD Platform SPN 4335/FMI 7 - EPA10Thediagnostics have been updated. Graphics have also
been added.
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All information subject to change without notice. 3227-14Copyright 2014 DETROIT DIESEL CORPORATION
2 SPN 4335/FMI 7 - EPA10
This diagnostic is typically DEF Metering Unit Air Pressure -Low.
Table 1.SPN 4335/FMI 7
Description Diesel Exhaust Fluid (DEF) Metering Unit AirPressure Low
Monitored Parameter Diesel Exhaust Fluid (DEF) Metering Unit AirPressure
Typical Enabling Conditions Engine rpm greater than 500, DosingEnabled
Monitor Sequence None
Execution Frequency Continuous when enabling conditions met
Typical Duration 6 seconds
Dash Lamps MIL
Engine Reaction Derate 25%
Verification SCR Air Pressure Test (test duration is 60seconds)
NOTE: If there is oil present in the air system, the cause ofthe oil intrusion needs to be corrected; Refer tosection"Inspection of the Diesel Exhaust Fluid Compressed Air Flow Systemafter Air Compressor Failure".
See AlsoINDMAR diagnostic manual v.3 · SPN 91 FMI 4 FPP1 Voltage Low(Pedal Position Sensor PPS) 336 SPN100 FMI 0 Oil Pressure Sender High Pressure 172 SPN100 FMI 1 Oil Pressure Low 178 SPN - [PDF Document]Cummins ISB6.7 CM2350 (2013-17) Fault Code: 4152 PID: SPN: 5743 FMI: 9 Aftertreatment Selective Catalytic Reduction Temperature Sensor Module- Abnormal Update Rate - EcuForce TruckTOURING - CH Bus Sales · 2014-11-21 · 4|TS 45 Rev. 00 / 14.05.14 FAUT CODES EnginE (Cummins) SPN FMI TEMSA DTC J1939 SPN/FMI Description Cummins Fault Code Cummins Description - [PDF Document]SPN 3055 FMI 15 Below Minimum with Maximum Command ... · SPN 157 FMI 3 (FRP), SPN157 FMI 4, SPN 157 FMI 20, and SPN 157 FMI 21 (FRP), and SPN 633 FMI 3, SPN 633FMI 4, and SPN 633 - [PDF Document]WARNING: ENGINE EXHAUST
To avoid injury from inhaling engine exhaust, always operate theengine in a well-ventilated area.Engine exhaust is toxic.
WARNING: PERSONAL INJURY
To avoid injury before starting and running the engine, ensurethe vehicle is parked on a levelsurface, parking brake is set, andthe wheels are blocked.
1. Start engine and ensure vehicle air pressure is above 689 kPa(100 psi). Go to step 2.2. Does the air pressure in the secondaryair system reach and maintain 689 kPa (100 psi)?
a. Yes; Go to step 3.b. No; diagnose and repair the cause of thelow air pressure. Refer to air compressor diagnosticl*terature.
3. Connect DiagnosticLink . Go to step 4.4. Turn ignition ON(key ON, engine OFF). Go to step 5.5. Visually inspect air supplylines from air tank to pressure limiting unit, DEF pump module andDEF metering unit for
leaks, kinks or damage. Is there any damage found?a. Yes; repairas necessary. Verify repair.b. No; Go to step 6.
6. Compare DEF metering unit air pressure to barometric airpressure (Baro) and DEF pressure. Is the DEF metering unitairpressure within 28 kPa (4 psi) of barometric air pressure (Baro)and DEF pressure?
a. Yes; Go to step 10.b. No; Go to step 7.
7. Remove the DEF metering unit air pressure sensor, Refer tosection "Removal of the Diesel Exhaust Fluid MeteringUnit AirPressure Sensor"and reconnect the electrical harness to the sensor.Go to step 8.
8. Compare DEF metering unit air pressure to barometric airpressure (Baro) and DEF pressure. Is the DEF metering unitairpressure within 28 kPa (4 psi) of barometric air pressure (Baro)and DEF pressure?
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4 All information subject to change without notice.Copyright2014 DETROIT DIESEL CORPORATION2 27-14
a. Yes; reinstall the DEF metering unit air pressure sensor.Refer to section "Installation of the Diesel Exhaust FluidMeteringUnit Air Pressure Sensor". Go to step 9.
b. No; replace the DEF metering unit air pressure sensor. Referto section "Installation of the Diesel Exhaust FluidMetering UnitAir Pressure Sensor". Verify repair.
9. Turn ignition OFF. Go to step 10.10. Remove and inspectfitting (1) and (2) from the pressure limiting unit. Is there anyoil, rust or other contamination
present?a. Yes; diagnose and repair the cause of thecontamination. Refer to section "Inspection of the Diesel ExhaustFluid
Compressed Air Flow System after Air Compressor Failure" andTechnical Service Letter 12TS16REVhttp://ddcsn-ddc.freightliner.com/cps/rde/xbcr/ddcsn/12TS16REV.pdf(http://ddcsn-ddc.freightliner.com/cps/rde/xbcr/ddcsn/12TS16REV.pdf).Verify repair.
b. No; Go to step 11.
11. Disconnect the quick-connect air supply line (1) to the DEFmetering unit. Go to step 12.
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All information subject to change without notice. 5227-14Copyright 2014 DETROIT DIESEL CORPORATION
http://ddcsn-ddc.freightliner.com/cps/rde/xbcr/ddcsn/12TS16REV.pdfhttp://ddcsn-ddc.freightliner.com/cps/rde/xbcr/ddcsn/12TS16REV.pdfhttp://ddcsn-ddc.freightliner.com/cps/rde/xbcr/ddcsn/12TS16REV.pdfhttp://ddcsn-ddc.freightliner.com/cps/rde/xbcr/ddcsn/12TS16REV.pdf
12. Connect a suitable air gauge 0 to 1,379 kPa (0 to 200 psi)to the end of the DEF metering unit air supply line. Go tostep13.
13. Turn the ignition ON (key ON, engine OFF). Go to step14.
NOTE: The vehicle air pressure should be above 689 kPa (100 psi)before performing the SCR Air Pressure Test.
14. While monitoring the air pressure gauge, perform SelectiveCatalytic Reduction (SCR) Air Pressure Test; Refer tosection"Selective Catalyst Reduction Air Pressure System Check". Is theair pressure between 537 to 586 kPa (78 to 85psi)?
a. Yes; Go to step 15.b. No; replace the Pressure Limiting Unit(PLU). Refer to OEM diagnostics. Verify repair.
15. Remove the metering unit. Refer to section "Removal of theDiesel Exhaust Fluid Metering Unit" . Go to step 16.16. Remove theDEF metering unit air supply line fitting and the DEF metering unitcompressed air supply screen (2).
Refer to section "Removal of the Diesel Exhaust Fluid MeteringUnit Compressed Air Supply Screen". Go to step 17.
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6 All information subject to change without notice.Copyright2014 DETROIT DIESEL CORPORATION2 27-14
NOTE: Oil contamination can be easily identified by dabbing theair channel inlet elbow (1) on a clean papertowel. If an oil ring(2) is noticed, the air inlet screen will be contaminated as well.If inlet screen is contaminated,continue diagnostics and repair thecontamination source before installation of new inlet screen.
17. Inspect the DEF metering unit compressed air supply screenfor debris. Is there oil or rust on the air inlet screen?a. Yes;diagnose and repair the cause of the contamination. Replace the airinlet screen. Refer to section "Inspection
of the Diesel Exhaust Fluid Compressed Air Flow System after AirCompressor Failure" and TS letter12TS-16REVhttp://ddcsn-ddc.freightliner.com/cps/rde/xbcr/ddcsn/12TS16REV.pdf(http://ddcsn-ddc.freightliner.com/cps/rde/xbcr/ddcsn/12TS16REV.pdf).Verify repair.
b. No; Go to step 18.
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All information subject to change without notice. 7227-14Copyright 2014 DETROIT DIESEL CORPORATION
http://ddcsn-ddc.freightliner.com/cps/rde/xbcr/ddcsn/12TS16REV.pdfhttp://ddcsn-ddc.freightliner.com/cps/rde/xbcr/ddcsn/12TS16REV.pdfhttp://ddcsn-ddc.freightliner.com/cps/rde/xbcr/ddcsn/12TS16REV.pdf
18. Remove the DEF metering unit air pressure sensor; Refer tosection "Removal of the Diesel Exhaust Fluid MeteringUnit AirPressure Sensor". Go to step 19.
19. Remove the three screws (1) from the bottom of the meteringunit; remove the diffuser heater. Refer to section"Removal of theDiesel Exhaust Fluid Metering Unit Diffuser Heater". Go to step20.
20. Inspect the diffuser heater. See the following figure for anexample of plugged and clear diffusers. Is the Diffuserplugged orrestricted by DEF crystals?
a. Yes; flush the diffuser heater (1) using warm running waterfor several minutes to dissolve the DEF crystals. Goto step 21.
b. No; flush the DEF metering unit air passage with warm runningwater for several minutes to dissolve the DEFcrystals. Go to step21.
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8 All information subject to change without notice.Copyright2014 DETROIT DIESEL CORPORATION2 27-14
Table 2.
Diffuser Outlet Plugged Diffuser Outlet Restricted DiffuserOutlet 100% Clear
Diffuser Inlet Plugged Diffuser Inlet Partial RestrictionDiffuser Inlet 100% Clear
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All information subject to change without notice. 9227-14Copyright 2014 DETROIT DIESEL CORPORATION
WARNING: EYE INJURY
To avoid injury from flying debris when using compressed air,wear adequate eye protection (faceshield or safety goggles) and donot exceed 276 kPa (40 psi) air pressure.
21. After the blockage is cleared, blow out any remaining waterin the sensor connection and install all removedcomponents.
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10 All information subject to change without notice.Copyright2014 DETROIT DIESEL CORPORATION2 27-14
Refer to section "Installation of the Diesel Exhaust FluidMetering Unit Diffuser Heater".Refer to section "Installation ofthe Diesel Exhaust Fluid Metering Unit".Refer to section"Installation of the Diesel Exhaust Fluid Metering Unit AirPressure Sensor". Go to step 22.
22. Perform the SCR air pressure test. Does the SCR air pressuretest pass?a. Yes; release the vehicle.b. No; Go to step 23.
23. Remove the DEF metering unit outlet pressure line from theDEF metering unit. Go to step 24.24. Use a 1/4 inch metal flare capto block off the outlet port of the DEF metering unit. Go to step25.
25. Perform the SCR air pressure test. Does the air pressurereach 537 kPa (78 psi)?a. Yes; replace the DEF nozzle in the ATS.Verify repair.b. No; re-clean the DEF metering unit using warmwater. Verify repair. Go to step 26.
26. Is fault code SPN 4335 FMI 7 still present?a. Yes; replacethe DEF air pressure sensor. Refer to section "Removal of theDiesel Exhaust Fluid Metering Unit
Air Pressure Sensor". Verify repair.b. No; release thevehicle.
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All information subject to change without notice. 11227-14Copyright 2014 DETROIT DIESEL CORPORATION
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FAQs
What does SPN mean in fault codes? ›
SPN stands for Suspected Parameter Number which tells you the circuit where the fault occurred. For example, if you had a SPN 1791 code, it would point to a fault detected in the EGR Valve Control Circuit. FMI stands for Failure Mode Indicator which tells you the reason the fault code was set.
What does SPN mean in diagnostics? ›SPN stands for Suspect Parameter Number. It's a diagnostic trouble code that provides detailed information about specific faults detected by the vehicle's ECU, making it easier to identify and address issues within the vehicle's electronic systems.
What does SPN mean on engine? ›Suspect Parameter Number (SPN): SPN is a diagnostic fault code assigned by the SAE to a specific part or electric subsystem. It helps technicians locate where the problem is occurring. It's also used to identify issues with a Controller Application (CA). Failure Mode Identifier (FMI): FMI identifies the type of error.
What does FMI 7 mean? ›A component failure would look like an FMI 12 for bad device/component or an FMI 7 for a component not responding or being out of adjustment.
What does FMI mean in fault code? ›FMI stands for failure mode identifier—this part of the fault code tells you what type of problem your truck has. For example, in the fault code SPN 3226 FMI 13, the SPN number 3226 tells you the problem is with the SCR outlet NOx sensor and FMI 13 tells you that the signal from the part is unavailable.
How do I remove all SPN? ›To remove an SPN, use the setspn -d service/name hostname command at a command prompt, where service/name is the SPN that is to be removed and hostname is the actual host name of the computer object that you want to update.
What is FMI 14? ›FMI 14 – Special Instructions: The TECU has detected an abnormally long up or down button request.
How to reset a permanent OBD code? ›The only way to clear a PDTC is to fix the underlying problem with the vehicle that originally caused the PDTC and its corresponding DTC to set, and then allow the vehicle sufficient drive time to re-run the monitor that identified the problem in the first place.
What is the code SPN 111 on a Freightliner engine? ›SPN 111/FMI 4
Description This Fault Sets when the Common Powertrain Controller (CPC) Detects that there is a Short to Ground on the Coolant Level Circuit or the Engine Coolant Level is Low.
SPN 91/FMI 10 – Throttle Pedal Rationality Check Failed is set by the driver pressing the throttle pedal and brake pedal simultaneously. The code is informational and will log in memory; however, no lamps will illuminate. The codes become inactive after an ignition cycle.
What is the full meaning of SPN? ›
A service principal name (SPN) is a unique identifier of a service instance. Kerberos authentication uses SPNs to associate a service instance with a service sign-in account.
What does the SPN stand for? ›A service principal name (SPN) is a unique identifier of a service instance. Kerberos authentication uses SPNs to associate a service instance with a service sign-in account.
What show does SPN stand for? ›Supernatural is an American television series created by Eric Kripke. It was first broadcast on September 13, 2005, on The WB, and subsequently became part of successor network The CW's lineup.
What does SPN stand for in engineering? ›Based on the number of poles, the breakers are classified as – SP –Single Pole, SPN – Single Pole and Neutral DP – Double pole, TP – Triple Pole, TPN – Triple Pole and Neutral, 4P – Four Pole.
What does SPN mean technology? ›SPN stands for Service Packet Network, which is a next-generation transport network architecture that builds upon, improves, and pioneers packet transport network (PTN) technology.