99 STS Engine Temp Sensor problem
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 3 of 3
Northstar Engines and System Technical Discussion Discussion, 99 STS Engine Temp Sensor problem in Cadillac Engine Technical Discussion; I have a 1999 STS with 104k miles. I have had a check engine light and went into the OBDII ...
  1. #1
    dlueker is offline Cadillac Owners Member
    Join Date
    Jul 2005
    Location
    Fargo, ND
    Age
    35
    Posts
    4

    99 STS Engine Temp Sensor problem

    I have a 1999 STS with 104k miles. I have had a check engine light and went into the OBDII through the DIC and found its caused by the engine temp sensor. I am now looking for it on the engine and cannot find it. Any help? Also, I found something interesting when I was in Diagnosic mode on the DIC. When I was looking at the PROM ID's, it shows my PCM is not supported, when it is supposed to be telling me the number for the PCM. Is this normal? I bought the car used, and now am wondering if the PCM has been replaced and itsn't programmed or something. All of the other systems checked out though, and they displayed their numbers on the DIC. Any help would be greatly appreciated!

  2. Remove Advertisements
    CadillacForums.com
    Advertisements
     

  3. #2
    mcowden is offline Cadillac Owners Connoisseur
    Join Date
    Jun 2003
    Posts
    1,164

    Re: 99 STS Engine Temp Sensor problem

    Quote Originally Posted by dlueker
    I have a 1999 STS with 104k miles. I have had a check engine light and went into the OBDII through the DIC and found its caused by the engine temp sensor. I am now looking for it on the engine and cannot find it. Any help? Also, I found something interesting when I was in Diagnosic mode on the DIC. When I was looking at the PROM ID's, it shows my PCM is not supported, when it is supposed to be telling me the number for the PCM. Is this normal? I bought the car used, and now am wondering if the PCM has been replaced and itsn't programmed or something. All of the other systems checked out though, and they displayed their numbers on the DIC. Any help would be greatly appreciated!
    What is the code for the temp sensor? (Pxxxx)

    Do you have the remote key fobs for door lock/unlock and trunk and fuel door release? Do they work? Your ignition key does have the resistor pellet in it, right? It's possible the PCM was replaced at some point and not programmed exactly right. It could be missing calibration data perhaps. I don't know enough about it to tell you what other problems there might be, and our resident expert b b o b y n s k i is apparently on "sabbatical."
    Mike

  4. #3
    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
    72,351

    Re: 99 STS Engine Temp Sensor problem

    The ECT (engine coolant tempurature) sensor is located on the rear (driver side) of the right (rear) cylinder head.

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