heip 8v92 ddec2

jimsflx · November 14, 2011, 02:33:25 PM

runs about 3 minutes and shuts off. restarts and does it again my first ddec. on the dash right side is a small gauge it,s at 516 when started then goes down to 513 then shuts off. i thick this is the codes?it is a 1988 mci102c 8v92 auto.thanks jim

rv_safetyman · November 14, 2011, 02:40:08 PM

Jim, not sure what the gauge is that you see, but it is probably not a fault code display.

You should have an orange/yellow light and a red light together on your dash. One should say check engine and the other should say stop engine (red). If one or both come on, there is a fault thrown by the ECM. If neither come on, it is most likely a fuel delivery problem or possibly a low voltage problem.

The low voltage problem tends to make the engine run very rough.

If you have no warning lights then I would pull one of the fuel filters and make sure you have fuel.

As I was writing this, I recall one of our members had a problem with the breaker/fuse that supplies power to the ECM. Might want to check that as well.

Jim

jimsflx · November 14, 2011, 02:53:18 PM

thanks jim it does have the lights on the left. we have gone over the fuel system it is getting fuel we pulled the plugs on temp and fuel sending units but it still stops with them unpluged thing it is electric. what about the low voltage? we turn it over so many times we had to put a charger on the bateries. thanks jim

Sean · November 14, 2011, 03:03:33 PM

Are you certain the CEL and SEL lamps are both working? They should both come on as part of the lamp test when you first turn on the master switch, then go out within 5 seconds. If the lamps don't come on during the test, that's the first problem you need to fix.

-Sean
http://OurOdyssey.BlogSpot.com

Ace · November 14, 2011, 03:13:49 PM

It would be best to just grab the codes from the ecm end know exactly where to start! You could be chasing it forever without knowing what the ecm knows!

jimsflx · November 14, 2011, 03:31:46 PM

thanks sean , the lites do come on;and thanks ace,how do you grab the codes? thanks jim

Ace · November 14, 2011, 03:43:00 PM

There should be a switch someplace maybe even outside that allows you to put the ddec into test mode. After doing that, turn the key switch on and watch the yellow (check engine light) it should flash, then pause, then flash. Count the flashes such as 3 pause 1 pause 4 would indicate the code as 314. With that number, someone here can look it up if you don't have a manual to tell you exactly what the problem is. The 314 ras just a made up code.

luvrbus · November 14, 2011, 04:02:17 PM

513 and 516 are OBD2 codes he should be getting 53 and 56 from a reader a OBD2 reader some install on the dash will put a 1 between most codes sounds like he has EEProm problems

Iceni John · November 14, 2011, 04:04:58 PM

I've just finished completely rewiring my battery cables, and one of the things I encountered were the infamous DDEC injector fuses. There are two such fuses, each 15A, that supply the injectors, and their power is fed directly off the starting batteries, along with their grounds. Make sure they're making good contact. You may also have a fused 5A supply to a DDEC relay, in my bus up front in the main JB, and this also has its own feed and ground from the batteries. All this is separate from the main ECM power supply. If any of these fuses are iffy, your engine simply won't run right.

John

jimsflx · November 14, 2011, 04:27:43 PM

thanks guys,will try tomorrow ace the bus is at earls in plant city if you want to stop by jim

Sean · November 14, 2011, 04:28:17 PM

If neither the CEL nor SEL is coming on prior to the engine shutting down, I doubt that reading the codes will help, because it does not sound like an ECM-commanded shutdown.

I would definitely check the ECM power supply, and then the fuel delivery. Also check the air induction system.

To definitively check the fuel delivery, I would run a hose out of a jerry can right into the filter, bypassing the line from the tank.

-Sean
http://OurOdyssey.BlogSpot.com

jimsflx · November 14, 2011, 04:52:35 PM

sean i did the fuel can into the filter and also pulled fuel from the tank to the back by a electric pump so no air in lines.it is getting fuel starts right up and run great for abount 3 or 4 minutes then something shuts it down. thanks jim

Ace · November 14, 2011, 04:58:24 PM

Sounds like a low coolant voltage issue.
I have a ddec 2 pro link that I could bring by and see what the codes are.
I use it on mine all the time when there are faults but thankfully there have been none in a long while!
Call me if you want me to bring it over. I can do it tomorrow afternoon after my job gets done in Waldon oaks which is in plant city!
8635599067

luvrbus · November 14, 2011, 05:03:55 PM

Jim,you say it is a 1988 model are you 100% sure it is a DDEC11

good luck

jimsflx · November 14, 2011, 05:14:48 PM

clifford the motor came out of a prevost it was was a reliabuit about 9 years ago. the bus came with a 6v92 then was changed. i called dd in tampa,fl. they said it was a ddec2 so no i am not 100% sure,they did not want to spend time looking it up thanks jim