Fault Code SPN 729 FMI 5 (2024)

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06-23-2020, 11:42 AM

BHutting

Senior Member

Entegra Owners Club
Spartan Chassis

Join Date: Jun 2015

Location: Vacaville, CA

Posts: 354

Fault Code SPN 729 FMI 5

The dreaded Fault Code SPN 729 happened again for the second time. Sacramento Truck found that the "Mega Fuse" was making intermittent connection causing the fault. Upon closer inspection they found the fuse was cracked and that the mounting bracket was vibrating excessively while the engine was running. They replaced the fuse and reinforced and secured the mounting bracket to eliminate the vibration. I know the SPN 729 fault code is commonly discussed so I thought it would be good to pass this fix along. Sacramento Truck Center is the best!

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Bob & Anna Hutting
2016 Entegra Anthem 44B
2004 Jeep Liberty Limited - FMCA #343990

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06-24-2020, 08:59 AM

Gary.Jones

Senior Member

Join Date: Oct 2012

Location: Louisiana

Posts: 11,531

Blog Entries: 1

Bob

Could you please describe more fully what the problem was that you were having. The SPN 729, FMI 3 or 4, amber notice, code translated to "Engine intake Air Heater 1 Circuit - Voltage below normal or shorted to low source". If you could explain more what that fuse is, where it is, and what was done to make it more stable, (Pic?) I would really appreciate it..

Gary

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Gary and Dee, Zowie and Bowie (traveling cat sibs)
2019 Cornerstone 45B, X15-605hp, Imperial, Spartan K3,
2013 Honda CR-V toad, Demco Excali-Bar II,
Demco Baseplate, Demco Toad Light system, 73 de W5FI

06-24-2020, 10:36 AM

BHutting

Senior Member

Entegra Owners Club
Spartan Chassis

Join Date: Jun 2015

Location: Vacaville, CA

Posts: 354

Quote:

Originally Posted by Gary.Jones

Bob

Gary

Gary.... The engine cover in the bathroom floor had to be removed for access to the fuse. I have not seen what was done to the bracket or specifically where it is located. I would suggest contacting Spartan or Cummins for more detail. When I called Spartan, they said because it was an amber fault, I could drive the coach. There was no effect on the performance.

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Bob & Anna Hutting
2016 Entegra Anthem 44B
2004 Jeep Liberty Limited - FMCA #343990

06-24-2020, 12:21 PM

Balladeer

Senior Member

Join Date: Jan 2017

Posts: 232

spn 729

Went through this exercise as well.That is a mega amp fuse (about 240 amps).
The tech and I discussed and arrived at the theory that when starting, you turn on the ignition and the wait to start light comes on.
This means that the pre-heater is generating heat into the intake manifold and drawing a lot of amperage.
If you turn the key to turn over the engine before the wait light goes out you are then drawing more mega amps to the starter.
It is possible that the fuse will not take this.
Therefore be sure and wait till the wait to start light goes out before turning the engine over.
I now also cycle the wait to start twice on cold mornings.. ie turn on light goes out turn off turn on wait till start light goes out then start engine.
I have not had any trouble since then.

My repair was accomplished at Sacramento Truck as well. They are the best.

Fair winds and downhill grades...

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Gregg & Sandy, Penngrove, California
2016 Anthem 44B Victory Blue
2016 Jeep Cherokee Trailhawk 2020 Ford Ranger 4X4 Lariat

06-24-2020, 04:05 PM

BHutting

Senior Member

Entegra Owners Club
Spartan Chassis

Join Date: Jun 2015

Location: Vacaville, CA

Posts: 354

Quote:

Originally Posted by Balladeer

My repair was accomplished at Sacramento Truck as well. They are the best.

Fair winds and downhill grades...

Gregg.... That is exactly right.... I have always followed that procedure too! FYI.... Sacramento Truck Center has opened their new RV location. They are now at 171 Harris Ave. Sacramento, CA 95838. It is right behind the original location.

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Bob & Anna Hutting
2016 Entegra Anthem 44B
2004 Jeep Liberty Limited - FMCA #343990

06-24-2020, 04:16 PM

Tim Fox

Senior Member

Entegra Owners Club

Join Date: Dec 2015

Location: Venice FL

Posts: 791

Not sure if the X15 has one, but on our Anthems it is on the top right of the engine. Bit awkward to reach, but doable. As mentioned you have to gain access through the rear bath. I believe it is 250 amp and is available at most Napa’s.

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Tim F.
2022 Baystar 3014

06-24-2020, 05:45 PM

Gary.Jones

Senior Member

Join Date: Oct 2012

Location: Louisiana

Posts: 11,531

Blog Entries: 1

Well, this is very interesting.... I have known since my 15 Anthem that it was supposedly important for owners to wait for the amber outline of an engine icon on the dash to extinguish before trying to turn over the Cummins. However I have noticed that all the techs at Entegra or repair facilities and coach "valet" guys never wait for that delay. I have always thought that everyone that should know better (including Spartan and Cummins techs) does NOT wait for the delay and just presses engine start without waiting, so I started doing that also. ..... Now, I think that I am learning why it is proper to wait for the engine icon to go out..... that is the delay that is enabling the engine to heat to the point that the Cummins will start better. Hmmmmm, that makes perfect sense and adds an explanation to why that delay is good for starting. I have not generally been waiting for that icon to extinguish..... sometimes, but not all the time.... I will start doing that routinely.

That is all new to me...... one more thing to go into the "Archive of files and information probably important at some time in the future".

Thanks !! _____

Gary

06-28-2020, 10:22 AM

garysfb

Senior Member

Entegra Owners Club

Join Date: May 2019

Posts: 985

Gary, I believe i saw this posted a while back and I have done it ever since, go one step further and wait for all the lights to go out before starting. Just to be sure the gremlins haven't visited since you last shut it down. Typically the amber engine light will be the last one on and then disappears once started.

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Gary and Phyllis Small
2018 Anthem 44F
2019 Jeep Wrangler Unlimited - Sahara
2003 Alegro Bus (sold)

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FAQs

Fault Code SPN 729 FMI 5? ›

This code indicates there is an open circuit in the Intake Air Heater system.

Learn More Now ›

What is code 729 on Freightliner? ›

The SPN 729, FMI 3 or 4, amber notice, code translated to "Engine intake Air Heater 1 Circuit - Voltage below normal or shorted to low source".

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What is spn 729 fmi 7? ›

75.3 SPN 729/FMI 7

This diagnosis is typically grid heater defect. Check as follows: 1. Are any circuit related faults present? [a] Yes; troubleshoot those codes first.

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What is the FMI 3 SPN 729? ›

SPN#729, FMI#3 ? HIGH VOLTAGE AT INTAKE AIR HEATER SIGNAL CIRCUIT. (ECM). Failure to comply may cause damage to equipment.

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What does FMI 9 mean? ›

An FMI 9 failure code is an issue with the CAN communication where data is not being sent and received in a timely way by the engine computer. An example is a slow response or non-response from a VGT actuator or EGR valve, this will cause FMI 9 fault.

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What is the code 729 5? ›

This code indicates there is an open circuit in the Intake Air Heater system. The heater will come on every time the engine is started. If the engine is warm enough, it will go off. If it is cold, the heater will stay on for a few minutes.

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What is the code SPN 729? ›

SPN#729, FMI#3 ― High Voltage at Intake Air Heater Signal Circuit -- Continued.

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What does SPN and FMI mean? ›

These fields are: Suspect Parameter Number (SPN): Represents the SPN with error. Every defined SPN can be used in a DTC. Failure Mode Identifier (FMI): Represents the nature and type of error that occurred, e.g., value range violation (high or low), sensor short-circuits, incorrect update rate, calibration error.

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What does FMI stand for codes? ›

SPN is short for suspect parameter number. It identifies which electrical circuit, part or component of your truck isn't working properly. FMI stands for failure mode identifier—this part of the fault code tells you what type of problem your truck has.

What does FMI mean on a diesel? ›

FAILURE MODE IDENTIFIERS (FMI) Now that we have defined MID (The component) and PID (types of data), we can talk about Failure Mode Identifiers (FMI). Every diagnostic trouble code (DTC) that you find will have an FMI.

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What is an intake heater? ›

Intake air heaters are a key element of cold start systems for diesel engines that have a higher engine capacity. They are mounted next to the intake air collector and are intended to pre-heat and efficiently start the engine, ensure its stability and reduce emissions that are harmful to health and the environment.

What is the failure mode indicator FMI? ›

Failure Mode Indication (FMI), as part of the J1939 standard used in heavy-duty vehicles, functions by closely monitoring system components. When a fault occurs, FMI generates a precise code that identifies the specific nature of the issue, much like an advanced version of a 'check engine' light.

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What is code SPN 94 FMI 4? ›

This diagnostic is typically Fuel Compensation Pressure (FCP) Sensor Circuit Failed Low.

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What is FMI 8? ›

The FMI-8 is a multiplexer featuring eight RTS compatible four-wire intercom ports with keypanel data, Ethernet ports for OMNEO, along with serial data links on DB9 connectors for communication between intercom matrices and auxiliary devices.

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What does FMI 8 mean? ›

8. Abnormal Frequency, Pulse Width, or Period. 9. Abnormal Update Rate.

What is code 27 FMI 7? ›

Customers may experience Fault Code 27 FMI 7 and/or Fault Code 64 FMI 7 setting Active immediately after Electronic Clutch Actuator (ECA) is reinstalled or replaced. During ECA removal the Clutch Release Yoke Lower Cross-shaft may partially pull out of the release yoke.

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What does impaired powertrain function mean? ›

A powertrain malfunction is a general term used to describe a problem in the engine or transmission. The powertrain refers to the assembly that propels a vehicle forward, including components such as the engine, the transmission, the driveshaft, the axles, and the differential.

What is code 677 4 on Freightliner? ›

This fault code is for starter relay failed low. Be sure to check all of your fuses and relays as well as your wiring harness and connector pins within your starter solenoid and starter relay circuit for any type of corrosion or damage that would cause a short or open circuit.

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Fault Code SPN 729 FMI 5 (2024)

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FAQs

Fault Code SPN 729 FMI 5? ›

What is an intake heater? ›