PCM Overrides?
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
Page 1 of 2 1 2 LastLast
Results 1 to 15 of 27
Northstar Engines and System Technical Discussion Discussion, PCM Overrides? in Cadillac Engine Technical Discussion; I've seen references in various places on the web and heard from other people with Northstars that when they go ...
  1. #1
    mcowden is offline Cadillac Owners Connoisseur
    Join Date
    Jun 2003
    Posts
    1,164

    PCM Overrides?

    I've seen references in various places on the web and heard from other people with Northstars that when they go into the DIC diagnostics PCM section, they have entries for PCM DATA, INPUTS, OUTPUTS, and/or OVERRIDES. On my 96 SLS, I only see PCM CODES and PCM CLEAR CODES. Is there some reason why I can't see the other goodies? Perhaps it's not available on a '96, or not on analog cluster cars? Is it something that has to be enabled with one of the IPC overrides, or is there some super-secret button sequence or engineer handshake you have to do to enable it? I'm just curious, it's not a problem.

    M C
    Mike

  2. Remove Advertisements
    CadillacForums.com
    Advertisements
     

  3. #2
    BeelzeBob's Avatar
    BeelzeBob is offline I'm a Cadillac Fanatic!
    Join Date
    Dec 2002
    Location
    Fort Lauderdale, Florida
    Age
    50
    Posts
    9,577

    Re: PCM Overrides?

    It was not available on a 96 or later due to OBD2. The federal requirements for OBD2 commonized the diagnostic codes, readouts, OBD access, etc... The PCM override and other functions were not in compliance with the OBD2 regulations so they were discontinued. You'll have to buy a 95 or older car to have a non-OBD2 car with the PCM overrides.

  4. #3
    mcowden is offline Cadillac Owners Connoisseur
    Join Date
    Jun 2003
    Posts
    1,164
    Thread Starter

    Re: PCM Overrides?

    I figured it would be something like that... Thanks very much for the info, Bbob!



    M C
    Mike

  5. #4
    carguy is offline Cadillac Owners Member
    Join Date
    May 2004
    Location
    Florida
    Posts
    44

    Re: PCM Overrides?

    I have a 1996 ETC. I believe that I saw overrides and data?
    Do I have a 1995 computer? Is my car OBD II or OBD I.
    Is there any way to tell?

  6. #5
    BeelzeBob's Avatar
    BeelzeBob is offline I'm a Cadillac Fanatic!
    Join Date
    Dec 2002
    Location
    Fort Lauderdale, Florida
    Age
    50
    Posts
    9,577

    Re: PCM Overrides?

    Quote Originally Posted by carguy
    I have a 1996 ETC. I believe that I saw overrides and data?
    Do I have a 1995 computer? Is my car OBD II or OBD I.
    Is there any way to tell?

    If you have a 96 car you do not have a 95 computer....no way possible for it to work.

    Your car, by federal law, is an OBD2 car....no exceptions. That is how you tell. OBD2 requirements took effect beginning with the 96 model year.

    I doubt that you saw PCM overrides or data.. The OBD requirements just apply to the engine/emission control system. That is the overrides and such that reverted back to using a Tech tool to access them. There are no OBD requirements for accessories and secondary systems on the cars. Therefore you will still see overrides, data parameters and such for the other systems like the IPC, TCS, RSS.....

    The onboard displays can still display the trouble codes and be OBD2 compliant so that part was left in for the PCM but any of the other onboard diagnostic functions for the PCM were discontinued and must be accessed via the Tech tool.

  7. #6
    STS 310's Avatar
    STS 310 is offline Cadillac Owners Connoisseur
    Automobile(s): 1996 STS
    Join Date
    Dec 2003
    Location
    LOS ANGELES CA
    Posts
    1,489

    Re: PCM Overrides?

    I know you can enter the PCM interface for somethings ( I dont know). It is possible that you saw "PCM?" or "IPC?". You are able to change some things this way but I dont the extent. I have only used the IPC to change values to the DIC to get the temp reading digitally.

  8. #7
    94CaddyConcours's Avatar
    94CaddyConcours is offline Cadillac Owners Fanatic
    Automobile(s): 1994 CADILLAC DEVILLE CONCOURS, 350ZR
    Join Date
    Jul 2004
    Location
    LONG BEACH KALIFORNIA, HOUSTON
    Posts
    444

    Re: PCM Overrides?

    What the purpose of overiding? I dont know what the code are.

  9. #8
    peteski is offline Cadillac Owners Enthusiast
    Automobile(s): 85 Eldo Biarritz
    Join Date
    Dec 2003
    Location
    Northeast USA
    Posts
    808

    Re: PCM Overrides?

    It is used mostly to help you diagnosing problems.

    For example you can command the ISC (Idle Speed Controller) motor to extend or retract. Or turn the cooling fans on in lo or hi speed. Or, turn the AC clutch on. Or turn off a fuel injector. Stuff like that.

    Today's cars are pretty much "computers on wheels" and you need this kind of functionality to be able to fix them.

    Peteski

  10. #9
    mcowden is offline Cadillac Owners Connoisseur
    Join Date
    Jun 2003
    Posts
    1,164
    Thread Starter

    Re: PCM Overrides?

    It would be fun to tinker around with those settings, as long as they're not permanent, just to test things if the need arises. Since they don't appear on 96 or later cars, I guess I'm just SOL, which means Sadly Out of Luck.
    Mike

  11. #10
    carguy is offline Cadillac Owners Member
    Join Date
    May 2004
    Location
    Florida
    Posts
    44

    Re: PCM Overrides?

    I know this is old, but I wanted to post. I have a 1996 ETC.
    I do have the data, inputs, outputs, overrides. IPC does have overrides. I have been in the section, but don't understand as the labels and numbers don't make sense.

  12. #11
    CadillacSTS42005's Avatar
    CadillacSTS42005 is offline Banned
    Automobile(s): 2005 STS4 1SG: GM Acc Lights, Corsa, Platnium Grille, Volant
    Join Date
    Oct 2005
    Posts
    15,992

    Re: PCM Overrides?

    you dont have a 96 then...

  13. #12
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
    Join Date
    Jun 2004
    Location
    Woodstock Ill.
    Age
    66
    Posts
    74,820

    Re: PCM Overrides?

    You're going to need a FSM to decipher all that.

  14. #13
    ManuCadillacStS98 is offline Cadillac Owners Member
    Automobile(s): seville sts
    Join Date
    Apr 2009
    Age
    28
    Posts
    12

    Re: PCM Overrides?

    How to go to PCM OVVERRIDE with a cadillac sts 98 (OBD2).

    I think I can i go with a tech 2?

    There are a another scanner or metod that allows less expensive to go to PCM OVVERRIDE?

    thank you

  15. #14
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
    Automobile(s): 2002.5 F55 STS/65500mi, 2004 Ford F150 SuperCab4x4
    Join Date
    Feb 2006
    Location
    MD Eastern Shore - Kent Island
    Age
    75
    Posts
    46,018

    Re: PCM Overrides?

    Can't be done. Read your parallel post next to this thread.

  16. #15
    Mark C's Avatar
    Mark C is offline Cadillac Owners Connoisseur
    Automobile(s): 1997 Seville STS, 2000 Seville STS
    Join Date
    Jul 2007
    Age
    56
    Posts
    1,681

    Re: PCM Overrides?

    I have overrides, data, etc on my 97 STS for other controllers, like the IPC but not for the PCM. Just been afraid to change any of the settings.

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