DDEC comes on unreliably

[Bill Gerrie]

Sebulba
How about some pictures of the dash light area. It would help us that are not familiar with your coach help you. All DDEC units operate the same whether GM or MCI or whatever. Need to see your light and intermittent switch set up to help you. Maybe a phone number when you are at the bus might help also.

[luvrbus]

My son worried with his RV for months,it would throw cat eyes on the shift pad and would not start or just shut down driving,WW Williams spent a month try to find out the problem ,Williams could never get it to duplicate his problems, so they changed a few parts and sent him on way for $3700.00.
He started on his 250 mile voyage from Scottsdale to see us it quit and he had it towed to our place 150 miles.I started checking like always at the battery and found his ECM power lead had 1 strand of wire left in the connection terminal,cut the wire back about 2 inches,installed a new terminal 6 months and it hasn't missed a lick, those things are pretty simple.
Your information center on the D is dropping a ground,the info center  is ground energized. Open a account with MCI Tech support and they will tell you what is going on they know their side pretty good .The MCI D has a chassis computer you have to deal with too for lights and gauges     

[Bill Gerrie]

The two lights are lit in picture 1 near the low air light. Now to find out the diagnostic switch or trigger to make them flash out codes.

[luvrbus]

The two lights are lit in picture 1 near the low air light. Now to find out the diagnostic switch or trigger to make them flash out codes.

The diagnostic switch is on the side of the panel on the driver's side was on our DL,some have a diagnostic switch  in the first bay drivers' side behind the door for the breakers on the tunnel,they have test ports there also for the Allison and the engine .DEC the 25th is not far off he needs to ask Santa for a SliverLeaf 

[Bill Gerrie]

Read luvrbus's post. He is very knowledgeable around bus's.

[buswarrior]

On your instrument panel, check engine and stop engine are the modern equivalants?

Get them to flash the codes.

Happy coaching!
Buswarrior

[luvrbus]

Flashing codes still require you to take to a shop to clear the codes,the backup battery prevents one from draining the power from the ECM to clear any codes,the Sliverleaf will display the codes, but you cannot erase any codes with the Sliverleaf 

[Bill Gerrie]

I can see you asking Santa for a ProLink for Christmas. HO HO HO

[Sebulba]

From what I see in your posted pictures, the SEL is Stop Engine and the CEL is Check Engine.

Looks like both the CEL and the SEL are lighted.

Aha!  That was my frustration.  I was looking for something that said SEL and CEL.

Thank you.

Seb

[Sebulba]

On your instrument panel, check engine and stop engine are the modern equivalants?

Get them to flash the codes.

Happy coaching!
Buswarrior

Gotcha,. Thanks

Seb

[Sebulba]

Sebulba
How about some pictures of the dash light area. It would help us that are not familiar with your coach help you. All DDEC units operate the same whether GM or MCI or whatever. Need to see your light and intermittent switch set up to help you. Maybe a phone number when you are at the bus might help also.

Hello,

I posted some pics a couple posts back, but here they are again.

Thanks

Seb

[Sebulba]

Hello all,

Now I need to find out what a Silver leaf and Pro Link are.

Any links you can share?

Thanks

Seb

[Sebulba]

The many variables...

Stock, the computers bypass the main disconnect, to keep the computers "alive" for regular operations.

For a busnut, that's a battery drain when the coach gets parked or stored for extended periods.

If changed to be switched, those computers may need time to come back to life, after being disconnected via a battery cut-out switch?

Add in the internal battery, as luvrbus notes, if it is unhealthy... never met any kind of computer that operated correctly, once the internal battery stopped functioning correctly...

The lack of start-up system check SEL and CEL, does it correspond with the other loss of function of the Driver Display, et al?

Happy coaching!
Buswarrior

Hello Bus Warrior,

As for battery drain I got the NOCO Genius 2 battery maintainer as per your recommendation.  I like it very well.  Mounted it in the living area above the batteries and know my batteries are charged every day

Don't use a battery cutout switch.  Just the main disconnect that came on the bus.  Until this thread I thought that did disconnect everything.

Don't know if the internal battery is functioning or not.  Have never disconnected the batteries.

The only loss of function I have noticed when display doesn't light is high idle and turn signals.  I know about the turn signals because I drove it once when we first got it with the the DDEC not lit and the signals didn't work.  On that instance, I shut it down and started back up after done shopping at Home Depot and the DDEC lit.

Now, of course, I will watch for those two light after turning on main power, and hopefully they will go out then hit start.  As I understand that is the correct start procedure.

The operator manual mentioned none of of this.

Thanks

Sevb

[Sebulba]

My son worried with his RV for months,it would throw cat eyes on the shift pad and would not start or just shut down driving,WW Williams spent a month try to find out the problem ,Williams could never get it to duplicate his problems, so they changed a few parts and sent him on way for $3700.00.
He started on his 250 mile voyage from Scottsdale to see us it quit and he had it towed to our place 150 miles.I started checking like always at the battery and found his ECM power lead had 1 strand of wire left in the connection terminal,cut the wire back about 2 inches,installed a new terminal 6 months and it hasn't missed a lick, those things are pretty simple.
Your information center on the D is dropping a ground,the info center  is ground energized. Open a account with MCI Tech support and they will tell you what is going on they know their side pretty good .The MCI D has a chassis computer you have to deal with too for lights and gauges     

Ok, I will talk to MCI

Thanks

Seb

[Sebulba]

Read luvrbus's post. He is very knowledgeable around bus's.

I know.  I wish I knew a half a percent of what he knows.

Seb