Check Engine light - MCI 102C3

John316 · March 20, 2017, 04:42:35 PM

I doubt it is a battery issue.

Walk us through what is going on. When you turn the master switch on, before you turn the ignition, what happens? Do you show voltage? Does your transmission shift pad light up and show you in neutral?

We need more details.

JT4SC · March 20, 2017, 05:00:33 PM

It looks like it might be the coolant. Level looks real low. What do I mix in there, regular coolant and water?

Oonrahnjay · March 20, 2017, 05:19:05 PM

Quote from: JT4SC on March 20, 2017, 05:00:33 PMIt looks like it might be the coolant. Level looks real low. What do I mix in there, regular coolant and water?

What is in it already? You *do* have a couple of gallons pre-mixed in your maintenance supplies, don't you???

John316 · March 20, 2017, 06:36:42 PM

You will get a ton of different answers on the coolant. Yes, it needs to be mixed. Since you are a new bus owner, I doubt you know what is in there.

I suggest that you get some 50/50 mix from a local truck stop. Then, as soon as you get back from this trip, flush the system and make sure you have the right stuff in there.

JT4SC · March 20, 2017, 07:12:57 PM

The 24V generator light on the control board in the engine compartment is not on. I believe it is always on, but could be mistaken. This would explain the dead battery and I would assume the check engine light. With that said the "Not Gen" light on the dash is NOT on, so that theory may be out the window.

If I can't figure this out tonight I will probably go to a service shop tomorrow morning.

Geoff · March 20, 2017, 07:52:46 PM

Quote from: JT4SC on March 20, 2017, 05:00:33 PM
It looks like it might be the coolant. Level looks real low. What do I mix in there, regular coolant and water?

That was what I was thinking, but with DDEC you never know. My MUI engine just has a red indicator light on the dash for low coolant level. Your symptoms are exactly what happens when you are low on coolant.

Regular full strength green antifreeze and DISTILLED water 50/50 mix works for me.

--Geoff

lvmci · March 20, 2017, 08:08:40 PM

Hi JT4SC, if the coolant is red in the coolant window, like mine, you dont add water. lvmci...

JT4SC · March 20, 2017, 08:29:06 PM

Quote from: lvmci on March 20, 2017, 08:08:40 PM
Hi JT4SC, if the coolant is red in the coolant window, like mine, you dont add water. lvmci...

It is red, so I guess mixing it with the 50/50 isn't a good idea?

lvmci · March 20, 2017, 08:47:05 PM

I think NAPA, WW Williams, Stevensen, sells it. Smarter people than me will advise you, lvmci...

eagle19952 · March 20, 2017, 10:07:15 PM

Quote from: JT4SC on March 20, 2017, 08:29:06 PM
It is red, so I guess mixing it with the 50/50 isn't a good idea?

The most common reason for a check engine light is low coolant...check that.

Your welcome.

Brassman · March 20, 2017, 11:57:53 PM

Wet liner engines need an SCA additive in the coolant. Off the shelf stuff for diesel engines do come pre-charged, as per product label. It seems like a lot of DD 92's bite the dust because owners don't understand the importance of properly maintained engine coolant.

JT4SC · March 21, 2017, 05:34:07 AM

Update - I am now not as sure its the coolant, it was hard to tell the level on the sight glass yesterday. Now that the engine is totally cool it looks like the level in the surge tank is fine. Yesterday I put approx 1.5 gallons of 50/50 coolant in the lower reservoir tank.

Going to have to bite the bullet and take her in to a shop and see what they find. Thanks again for all your help, I'm always very appreciative of your expertise and your time to help me.

JT4SC · March 21, 2017, 10:44:33 AM

The code is for a failed speed sensor. The speedometer is working fine but they said it's most likely a sensor at the tranny. Anyone else had this issue?

Scott & Heather · March 21, 2017, 10:51:29 AM

My generator light in my engine bay control box is never on, just tell us does the engine turnover or not? If it is turning over and not starting then it's obviously not your battery it's probably low coolant. If it's not turning over then you need to figure out why.

Sent from my iPhone using Tapatalk

luvrbus · March 21, 2017, 11:44:04 AM

Does the check engine light come on if not check the fuse going to ECM code 43 low coolant both the Stop Engine and Check Engine should be on.
I don't know what is going here but the DDEC is supposed to run 7 seconds with the 43 code. I never saw a DDEC that would not start and run a few seconds then shut down with low coolant