problems with the ECM/BCM modules in an 85 Fleetwood Brougham 2 door?
Cadillac
 

Cadillac Forums | Help Us Help You | Advertise | Cadillac Parts | Cadillac News | Cadillac Classifieds / (Old System)

Cadillac Technical Archive | Cadillac Dealers | Cadillac Reviews | Cadillac Dealer Reviews | Cadillac Vendors

CadillacForums.com is the premier Cadillac Forum on the internet. Registered Users do not see the above ads.
+ Reply to Thread
Results 1 to 4 of 4
Like Tree1Likes
  • 2 Post By dennis93coupe
RWD 19xx-1984 DeVille and Fleetwood,
1985-1996 Fleetwood and Brougham Forum Discussion, problems with the ECM/BCM modules in an 85 Fleetwood Brougham 2 door? in Past Cadillac Vehicle Discussion; Okay, here's the scenario... grandpa has an 85 Fleetwood Brougham 2 door Cadillac. Last week, any time going up an ...
  1. #1
    becky6879 is offline Cadillac Owners Member
    Automobile(s): 1985 Fleetwood Brougham
    Join Date
    Jun 2012
    Age
    35
    Posts
    2

    problems with the ECM/BCM modules in an 85 Fleetwood Brougham 2 door?

    Okay, here's the scenario... grandpa has an 85 Fleetwood Brougham 2 door Cadillac. Last week, any time going up an incline (even a slight one) the vehicle would spit, sputter, pop and nearly stall.

    Today, I sat down and we tried getting to the ECM/BCM diagnostics. We can get to the .., then E88, then .7.0 on the ECC panel. However, we CANNOT get into the ECM Data nor BCM, because the beginning switch diagnostics errors/fails on code .7.3, which is a drive circuit code. The repair book he has doesn't say ANYTHING about that code, or how to test it.

    After exiting and re-entering ECM diagnostic mode, hitting 'LO' on the ECC panel does NOTHING. Hitting any other button forces us OUT of ECM diagnostic mode and turns the heater on (and on a day like today, where the temp was in the 80s, hot air in the face is NOT fun). Hitting the 'Outside Temp' button does NOTHING as well.

    I'm suspecting the reason we can't get into the ECM Data diagnostics nor the BCM diagnostics is the drive circuit fail, but I don't see how this would be affected if you exit and re-enter diagnostic mode.

    Any suggestions on how to test the .7.3 drive circuit switch or get PAST this into ECM Data and/or BCM would be GREATLY appreciated!

  2. Remove Advertisements
    CadillacForums.com
    Advertisements
     

  3. #2
    SafariOne is offline Cadillac Owners Fanatic
    Automobile(s): 1981Cadillac Fleetwood Brougham D'Elegance Coupe m
    Join Date
    Mar 2008
    Location
    British Columbia
    Posts
    392

    Re: problems with the ECM/BCM modules in an 85 Fleetwood Brougham 2 door?

    You never mentioned anything about what you did to get into diagnostics, are you pushing OFF and WARMER?? With the conditions that you mentioned I would suspect the ECM is bad or fuel pump issues.

  4. #3
    becky6879 is offline Cadillac Owners Member
    Automobile(s): 1985 Fleetwood Brougham
    Join Date
    Jun 2012
    Age
    35
    Posts
    2

    Re: problems with the ECM/BCM modules in an 85 Fleetwood Brougham 2 door?

    Yep, the OFF and WARMER is what gets us to the .., then E88, then .7.0 on the ECC panel. After that, hitting the brake gets us to go through the Switch diagnostic cycle, which is where the .7.3 code error happens after the cycle completes. After that, NOTHING.

    Grandpa suspects fuel pump or fuel injectors, but he wants to be sure, so he's not buying parts he doesn't need.

  5. #4
    dennis93coupe's Avatar
    dennis93coupe is offline Cadillac Owners Connoisseur
    Automobile(s): 1993 Coupe Deville 2006 XLR Infrared, Ebony
    Join Date
    Feb 2010
    Location
    Orange County, CA
    Age
    60
    Posts
    2,467

    Re: problems with the ECM/BCM modules in an 85 Fleetwood Brougham 2 door?

    Quote Originally Posted by becky6879 View Post
    Okay, here's the scenario... grandpa has an 85 Fleetwood Brougham 2 door Cadillac. Last week, any time going up an incline (even a slight one) the vehicle would spit, sputter, pop and nearly stall.
    You need to get a fuel pressure reading. Going up incline and getting the driveability conditions you have would make me suspect the fuel pump and tank. There could be baffles broke loose inside the tank.

    Quote Originally Posted by becky6879 View Post
    The repair book he has doesn't say ANYTHING about that code, or how to test it.
    What repair book do you have? Is it a FSM factory Service Manual? When you are pulling codes and you get to .7.0, that is the end of fault or error codes. If you push a button or a couple of buttons after .7.0, then you are going into diagnostics for either the ECM or BCM. I know this sounds like a broken record, but a FSM will provide you with the best information. Chilton, and the other generic ones don't have the information you need. You might look here, sometimes a good deal can be found.

    http://motors.shop.ebay.com/i.html?_...506.m270.l1313

    Here is a sample of what you need. Make sure it is for a Brougham, not the Deville as they don't have what you are looking for.

    http://www.ebay.com/itm/1985-Cadilla...rature&vxp=mtr
    The Ape Man and The Ape Man like this.

Quick Reply Quick Reply

Register Now

Please enter the name by which you would like to log-in and be known on this site.
If you do not want to register, fill this field only and the name will be used as user name for your post.

Please enter a password for your user account. Note that passwords are case-sensitive.

Please enter a valid email address for yourself.

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Bookmarks

Cadillac Posting Rules

  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts
Read about Lincoln | Buick | Kia Forte Forum
Need products for your Cadillac? Check out your options at the links below:

custom floor mats | Cadillac Chrome and Black Chrome Wheels | window tinting