| Author | Message | ||
| les marston (Les_marston)
Registered Member Username: Les_marston Post Number: 265 Registered: 1-2010 Posted From: 68.151.225.213  Rating: N/A |
I finally got a chance to work on the coach for a bit this week. Got the hydronic furnace working so that the engine pre heat would work. Found that i had a battery with a bad cell. got another matching battery. Started the coach... had a hard time building air pressure.. Leaking air brake valve. I ordered a new valve from MCI, got it today. ( along with another order that should have gone to Laval Quebec) Installed the valve and fired up the coach. Cant put the transmission into gear for some reason (B500 Allison)... I called technical support and they walked me through a diagnostic on the transmission. It looks like the bad battery had a negative effect on the computer that controls the transmission. Monday i will try to reset the computer for the transmission. If that doesn't work I will have to have Waterious come out and hook up the scanner to the transmission. Moral of the story: Make sure that the batteries are good, the consequences are severe | ||
| marvin pack (Gomer)
Registered Member Username: Gomer Post Number: 1227 Registered: 3-2007 Posted From: 71.55.4.4  Rating: N/A |
Les, On most computerized systems,unhooking the battery and then jumping or shorting neg and pos terminals together will usually reset the computer. It works on all automotive systems and we are not supposed to know that tho. I just done that on a car that wouldn't run hardly and changed the spark plug wires and then unhooked the battery and shorted them together and held them for 30 secs,rehooked it up and down the road I went and all systems normal. gomer | ||
| les marston (Les_marston)
Registered Member Username: Les_marston Post Number: 266 Registered: 1-2010 Posted From: 68.151.225.213 Rating: N/A |
One of the things that Mci technical support had me do was to pull both gang plugs out of the computer and let it sit for about 5 min or more. This was to reset the computer. It didn't help. I have a schematic for the pins and will check voltage and ground on the computer but that might have to wait till monday. Fair comment, as they also had me clean and recheck all the connections on the batteries. I suspect that i am in the market for a new allison computer. Ouch! | ||
| Jack Fids (Jack_fids)
Registered Member Username: Jack_fids Post Number: 470 Registered: 1-2009 Posted From: 72.211.128.245  Rating: |
My starter woes being laid to the same condition... Maybe.... if those like us were BRANDED across the forehead with the words "Low Voltage Operator" the rest would learn quick in fear of the same .... ....if only there were a volunteer to Man the Iron a time a place a fire etc. . . .  | ||
| Bill Gerrie (Bill_gerrie)
Registered Member Username: Bill_gerrie Post Number: 425 Registered: 3-2006 Posted From: 216.198.139.38  Rating: N/A |
Les According to the book for 700 series Allisons with CEC electronic controls follow: -to retrieve codes without Prolink (the installation must include a Check Trans light) 1. start engine and run engine at idle with the selector in neutral 2. place and hold the Electronic Control test switch in the ON postion. 3. the Check Trans Light will flash the most important code if one is present. NOTE. If no codes are present there will be no flashes. Not like DDEC 25 code for all okay. To clear codes without Prolink 1. Turn vehicle off. 2. Place Electronic Control test switch in the ON postion. 3. Restart engine. 4. Make sure the park brake and service brake are applied, then shift from neutral to reverse, then back to neutral. Check white wire #201 for a good chassis ground. This wire will cause all kinds of problems if not a good ground. You might check the oil level as well. Check fuses/circut breakers as well. Bill | ||
| les marston (Les_marston)
Registered Member Username: Les_marston Post Number: 268 Registered: 1-2010 Posted From: 68.151.225.213 Rating: N/A |
Thanks Bill. I am not sure that a B500 would be a 700 series. I don't find a check transmission light but there is a blank on the control panel that is for this light but it was never knocked out and installed It is also listed on the sticker as optional. Now I am feeling very inadequate because I don't find an electronic control switch. I will be checking for a good ground. The two gang plugs that go into the computer have a lot of wires. Knowing that the ground is white and #201 is a huge help thanks | ||
| Bill Gerrie (Bill_gerrie)
Registered Member Username: Bill_gerrie Post Number: 426 Registered: 3-2006 Posted From: 216.198.139.38 Rating: N/A |
Les The B500 appears to be a 4000 series Allison. According to what I am able to find it uses CECII where the 700 series uses CECI. Hopefully somebody with this exact trans will drop in. Bill | ||
| les marston (Les_marston)
Registered Member Username: Les_marston Post Number: 269 Registered: 1-2010 Posted From: 68.151.225.213 Rating: N/A |
I appreciate your efforts Bill I am going to be back on that steep learning curve that this bussing thing takes us all on from time to time. Les | ||
| Gus Causbie (Gusc)
Registered Member Username: Gusc Post Number: 1256 Registered: 11-2005 Posted From: 173.202.9.198  Rating: N/A |
Gomer, Interesting post, but what did spark plug wires have to do with it? | ||
| Jack Fids (Jack_fids)
Registered Member Username: Jack_fids Post Number: 474 Registered: 1-2009 Posted From: 72.211.128.245 Rating: N/A |
In GOMERVILLE Wires iz jus' wires he's happy too! | ||
| marvin pack (Gomer)
Registered Member Username: Gomer Post Number: 1229 Registered: 3-2007 Posted From: 71.55.4.4 Rating: N/A |
The engine was not running properly and with a couple of plugs not firing right it caused the computor to say that the O2 sensors,map sensor, etc was bad, so a garage said ALL the sensors were bad, [goes to show scanners aren't always a fix], and it was going to cost upwards of $800 to repair[?] All it was needing was the plugs and wires. Straightned Everything out and now back to normal operation. After doing that work the owner took it back for meaness and told them to recheck it and they found nothing wrong that time. Shade Tree mec-a-nics are people with common sense not computer friendly either as they listen instead of not knowing how to work on a vehicle LOL Gomer | ||
| Gus Causbie (Gusc)
Registered Member Username: Gusc Post Number: 1258 Registered: 11-2005 Posted From: 173.202.40.77 Rating: N/A |
Gomer, Thanks, clears that up. The newest thing I own is a '94 Dodge Cummins 3500 which has minimum computer stuff, those things drive me nuts. | ||
| larry currier (Larryc)
Registered Member Username: Larryc Post Number: 346 Registered: 2-2007 Posted From: 207.200.116.13 Rating: N/A |
Start the bus. Hold the dash test switch on and go from N to R a couple of times. Mine is up for engine codes and down for trans codes. That usually clears the codes and off it goes. How cold is it up there? That trans won't pump below a certain temp if I remember right. It may need to warm up an hour or so in neutral and reverse. If you need parts or computer repair, don't buy anything until you talk to Randy or someone @GDE. 218-262-4553. They are the nationwide rebuilder for all electronic and sell for about 20 percent of retail. If you don't have a code switch, GDE can surely tell you how to reset from the drivers seat. These electronic units code out for no reason frequently, so there must be a way for a driver reset or at least a switch in one of the electrical service boxes somewhere on the bus. If that's the case you may need to flip a switch for flashing the codes and then leaving the switch in the test position, go cycle the tranny n-r-n-r-n-r, with the engine running. | ||
| les marston (Les_marston)
Registered Member Username: Les_marston Post Number: 276 Registered: 1-2010 Posted From: 68.151.225.213 Rating: N/A |
The codes are read from the shift pad by holding both the up and down arrows, Each code will come up one at a time. Unfortunately on this one when I do that it does nothing. It won't shift or show codes. I have been talking to Waterious and may have to have them send out the mobile service truck. I will talk to Randy and see what he thinks. Thank you for that piece of advice. I am on a steep learning curve on this one and need all the help I can get Les | ||
| R.C.Bishop (Chuckllb)
Registered Member Username: Chuckllb Post Number: 1459 Registered: 7-2006 Posted From: 97.213.204.234  Rating: N/A |
Larry... GDE stands for what?...I can't seem to locate them on the Google Search (I may be just over looking the obvious??? ..lots of GDEs but nothing that stands out as electronic repair.  ) Thanx. RCB | ||
| Bob Glines (Robertglines1)
Registered Member Username: Robertglines1 Post Number: 17 Registered: 11-2010 Posted From: 75.224.165.108 Rating: N/A |
one other easy ck. pins on connectors to make sure one didn't work it self loose in connector. Not pushed into connector far enough.. Could be male or female. Bob |
