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Engine Issue
Since there is no heading for “Engines” I figured the “General Discussions” area would be the next best place to post this issue.
Owned our new (to us) coach now for a little over two weeks and after traveling little more than 600 miles we have our first engine issue.
A screen came up that said “Check Engine At Next Stop”
Not knowing if this was a serious problem we pulled over as soon as we could and called Prevost support. They weren’t able to shed any light on the problem other than to say since the check engine light wasn’t on we could still drive the coach and visit a Prevost shop to have it checked out
Drilled down through the diagnostics with them and found under the engine menu:
“SID 214, Value too low”
Under the Non Specific menu found:
MID 127 Not Responding.
Scoured the internet trying to found out what these faults are but as close as I could guess it sounds like the backup battery in the ECM may have died but what do I know.
Anyone else had this issue and how was it resolved
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8 Replies
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Hello,
What is the year and model of your coach?
I really don’t have any input, BUT for over a year I dealt with “weird codes ” that would pop up.
I have a 98 XL with a series 60 engine, which I love and plan on keeping forever. No one could ever track down the issue so I decided to just change out the ECM. After I put in the new unit, everything is perfect.
Thanks
David Thomas
1998 Featherlight XL
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Did you check the coolant level? Low coolant will set off the check engine warning.
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SID 214 does map to “Real Time Clock Backup Battery Voltage Low”.
This is just the internal battery to keep the real time clock operating when disconnected from power. Should not impact operation. Some statistics may not have correct timestamp when you disconnect ECM from external battery (e.g. during change of chassis batteries).
The ECM battery can be replaced for about $300. Not sure I’d bother. Example http://dieselcontrolservice.com/index.php/detroit-diesel-ecm-services/detroit-diesel/detroit-diesel-ddec-iv-ddec-v-internal-lithium-battery-replacement/
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Thanks Threegreens.
Where did you find the info on the SID 214 fault? I couldn’t find it anywhere.
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If power is removed from the ECM will the faults be erased?
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Just so there is no confusion a low coolant level warning will not be on the check engine light. Low coolant level will result in a stop engine warning.
Depending on vintage there are only three or four stop engine causes. On all coaches low oil pressure, high coolant temp and low coolant level will result in a stop engine light. On newer coaches a high oil temp will also result in an SEL.
The expansion tank has the coolant level sensor and sometimes the sensor fails. If a low coolant level code occurs and the expansion tank has coolant above the sensor level usually a jumper between the sensor plug terminals (a paper clip) will extinguish the false code.
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Larry, can’t attach PDF. So here is a snippet.
Faults are stored in non-volatile RAM. Removing power from ECM will not erase them.
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$300 to replace a battery? I think not. Especially since the ECM is so easy to access. I think I’ll just replace the $15 battery myself. Pretty handy with a soldering iron. ;^)
Thanks for all your replies…
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