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Old 01-18-2025, 01:18 PM   #1
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ISM M11 starting problems

My Cummins 2002 ISM, M11Engine been turning over more than 8-10 seconds before starting. I changed the original starter, for the newer faster turning starter. Still same thing. I changed the old Parker Racor water fuel filter to the Davco 382. And now it starts up within 3 seconds. After a few months starting to take up 8-10 seconds again. I added a Silver Leaf for the gauges. I did a diagnostics off the Silver Leaf after starting the motorhome and got this.

ENG SPN 627 2 injector power
ENG SID 251 2 Power Supply

After talking with Mark Overholser with Silver Leaf this is what he came up with.

SPN 627 2 and SID 251 2 seem to have a common entry.
"Supply voltage to the ECM fell below 6.0 volts for a fraction of a
second... OR the ECM was not allowed to power down correctly (retain
battery voltage for 30 seconds after key)"
The effect is, "Possible no noticeable performance effects...
OR...engine dying or hard starting. Fault information, trip information,
maintenance monitor data, trending data, and user activated datalogger
data may be inaccurate"

This is Cummins Code, "434 Yellow"

There is also a second entry:
SAE Code PID 251 2, in the Cummins Documentation says, "Power to the
real time clock has been interrupted and its setting is no longer valid".
The effect is, "Time Stamp in the ECM power down data will be incorrect"

This is Cummins Code, "319 Maint"
And gave me this commit
Based on my Few Years Experience, I would guess you have a Loose
Connector, or possibly a Bad Ground some place. Even Oxide Build up on
the Terminals on the Battery could be the cause..

The Process of Starting the Coach causes the Voltage Drop... The
Starter PULLS a lot of Amperage when Cranking, if it is starting to
fail, it Might Pull the Battery Voltage down to a point that the Codes
are Generated, but recovers quickly enough that the ECM still does its job..

Any suggestions on what to do. Besides cleaning all the grounds and battery terminals. I’m sure there are some grounds and other connections, somewhere I don’t know about. Can I after disconnecting the batteries, Remove the plug connections on the ECM. Clean and spray with a contact cleaner (like DeoxIT D5) on them without doing any damage or cause a problem after I have the batteries disconnected to the ECM?
Any other suggestion would be appreciated.
Bob Baldwin
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Old 01-18-2025, 01:30 PM   #2
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If you have a Cummins Quickserve account you can do a fault code lookup and it will provide a description of the code with links to troubleshooting steps.

https://quickserve.cummins.com/info/index.html
create an account and then register your engine using the SN.
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Old 01-18-2025, 01:42 PM   #3
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I would start by testing the batteries. They may not be maintaining voltage under load. Get a helper. Voltmeter across battery bank and measure while cranking. They need to maintain 10-10.5 volts while cranking.
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Old 01-19-2025, 07:06 AM   #4
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Batteries 2 years old test good.
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Old 01-20-2025, 11:28 AM   #5
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I creative a account on quickserve.cummins.com. Where do I go for fault code lookup? Where will it provide a description of the code with links to troubleshooting steps.
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Old 01-20-2025, 11:41 AM   #6
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Did you register your engine using the SN?


If so open quickserve.
Across the top there will be tabs, the first tab is Parts, second tab is Service


Go to the Service tab and it will open another widow, within that window there will be a number of tabs, one will be labeled fault code lookup.


Put in a fault code in the appropriate format, I think they offer 3 with one of them being the SPN/FMI format.



If it is a good fault code it will provide a link to a description. Open that up, will will bring it up in another window in your browser. Within that document there will be liinks to specific steps on how to trouble shoot.


I normally print these to PDF and save them in my files for future reference.
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Old 01-21-2025, 07:37 AM   #7
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jacwjames Thank you for the information.
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