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soft engine shutdown
Hi,
We are having soft engine shutdown issues. Looking for a workaround. Stranded in Montana.
Here is what has occurred since we left Washington state
headed for Sturgis.Engine warning light along with soft engine shutdown. Limped to Detroit dealer in Missoula. Dealer determined cause was a false code
signal for coolant level. The dealer “unchecked”
engine coolant as a shutdown in ECM.
Left Missoula, went 60 miles and same shutdown occurred. Went back to dealer. Dealer then tied problem back to coolant
level, ran a couple of new wires to sensor, cleared all codes and sent us on
our way. Went about 25 miles, same
problem, returned. Dealer thought
problem was then a bad ECM. Ordered new
one, waited a day for freight to find out the ECM was lost in shipment. Dealer suggested programming a “shop DDEC2”
to see if the computer was actually the problem. Went about 150 miles with temporary DDEC2
with the same results-although the only code is (25) which is “no diagnostic
code in memory”. I uninstalled the temp DDEC2 and put the old
ECM in, checked all wires, connectors, ect. Drove 20 miles and same
problem-code 25-“no diagnostic code in memory”.All fluid levels have been monitored, all gauges have been normal,
engine performance excellent when not shutting down. Looking for a workaround for the shutdown so
we can be on our way. Thanks in advance
of your advice! Steve -
13 Replies
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What model year? Engine? DDEC II is likely an 8V92, but adding coach info in the signature line is helpful.
Under normal circumstances DDEC II coaches will only shut down due to low coolant level, low oil pressure and high coolant temp. Did the dealer check all three. Coolant level can be fooled by putting a paper clip or wire between the terminals on the connector. I think the same with the other sensors but that needs to be verified.
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Another thing needs to be added to Urgent help needed request…drivers cell phone number.
Could PC add that ? Important part of your request for help as I would not likely be walking around with my lap top on the side of the road.
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Al, Anyone can add any personal information they choose to any post. We do not have anyone’s phone numbers, only email addresses.
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Jon,
I think if drivers asking for help posted cell phone numbers that would be a very fast response from one of your members.
I believe in the excitement of posting a help message drivers for one reason or another forget the fastest contact a correct answer is cell phone message away.
I’am just suggesting a reminder would help.
If you can add a message as your cell # for faster response, give/leave cell # . Maybe some are reluctant to post their number.
So let’s say they do post a number to get help, the problem is resolved they can delete the number from the message.
Let the driver make the choice.
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I experienced a false low coolant level shutdown on my DDEC2 equipped 1989 8V92 once. Can’t remember exactly how I bypassed…I believe I first disconnected all wires from the low coolant sensor in the tank and that was unsuccessful. I believe I then connected both wires together on one terminal of the sensor and that worked. The problem was actually a defective low coolant level module which is located in the rear electrical box over the engine.
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As an additional reminder, for a real emergency, people may be hesitant, but can always get help from Prevost, and if they have an account number, it’s even better and faster and they just charge you accordingly for whatever assistance is given. Remember, that is one of the best features about having a Prevost.
Prevost PASS #: 1-800-463-7738
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What’s a “soft” engine shutdown? I’ve never experienced an engine shutdown (knocking wood). I didn’t know that there is more than one kind.
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I have not heard that term but I have had the ECM derate the engine. That was brought about when the CAC was leaking susbstantially.
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I am not sure about the MCI’s of the world, but here is a small clip out of the Series 60 user manual. This is also applicable to 8V92 or any DDEC controlled engine.
DDEC II
Detroit Diesel Electronic Controlled Series
60 engines can be equipped with a variety of
options designed to warn the operator of an
engine malfunction. The options can range
from “Check Engine” and “Stop Engine” panel
lights to automatic reduction in engine power
followed by automatic engine shutdown.
The power-down/shutdown option may be
activated by low coolant level, low oil pressure,
or high engine oil or coolant temperature.
DDEC III/IV
Detroit Diesel Series 60 engines equipped with
DDEC III or DDEC IV electronic control systems
are identified by a “K” in the sixth position of
the model number. Example: 6067GK60.
Detroit Diesel Electronic Controlled Series
60 engines can be equipped with a variety of
options designed to warn the operator of an
engine malfunction. The options can range
from “Check Engine” and “Stop Engine” panel
lights to automatic reduction in engine power
followed by automatic engine shutdown.
The power-down/shutdown option may be
activated by low coolant level, low oil pressure,
or high engine oil or coolant temperature.As an owner of a Detroit Diesel we all should be aware of what the systems we are using may do for us or to us as the case may be.
Cheers and happy bussin.
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thanks for the lesson, Bob. I had the same bus that you currently have with the 8v for a number of years, and my current bus with series 60. I have read the manuals, and understand how the engine de-rate and shutdown works. Nothing that you posted explains what is meant by the orginal poster by ” soft shut down”.
Yes, they probably did put the reject Series 60s in MCI buses, but they still function the same as the ones used by Prevost.
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Al
I agree with you when help is needed it is needed at that time and not in an e-mail form, a phone number would help to get any assistance possible from those who can lend assistance, not every situation is an emergency. -
Hey Steve,
Brian from American Fleet here… Were you ever able to get this problem resolved? Just curious.
Thanks
Brian Stanton
American Fleet Inc
417-865-4420
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Ben Cummings…
Great info to know… I had no idea… Thanks so much.
Hope you are fit and well.
Diane
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