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Cadillac DeVille Electrical/Lighting

151 messages,  Last post on Oct 27, 2009 at 1:37 PM

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What is this discussion about? Cadillac DeVille, Lights, Electrical, Sedan

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#31 of 151 Re: 97 Deville service engine soon light on [stealerman] by vic8 Apr 22, 2006 (9:44 am)
Replying to: stealerman (Apr 21, 2006 2:54 pm) Yes,I have the same PCM? on my 1997 Deville after running the system.I do not know what the question mark represents,I'm trying to find out,But I did repair my problem,which was an Oxygen sensor (trouble code P1139)which I did replace. If I was unable to access the on board computer and find the trouble code,that was causing the problem,I would of been at the mercy of my Cadillac dealer and you know what that would of cost. Replies to this message: stealerman (Apr 22, 2006 5:49 pm)
#32 of 151 Re: 97 Deville service engine soon light on [vic8] by stealerman Apr 22, 2006 (5:49 pm)
Replying to: vic8 (Apr 22, 2006 9:44 am) Thank you for your time God Bless.
#33 of 151 Service Engine Soon Light is back on again by vic8 Apr 11, 2006 (6:13 pm)
About 4 months ago my Service Engine Soon Light came on,on my 1997 Cadillac Deville.I found out how to access the on board computer and found the trouble code,which was causing the light to come on. The trouble code was P1139,which was the oxygen sensor located behind the catalytic converter.I purchased a new sensor and installed it. After the installation,I disconnected the positive lead to the battery and cleared the trouble code. Now after 4 months of operation and no incidents,the same code has suddenly reappeared.Now what? Replies to this message: Mr_Shiftright (Apr 12, 2006 8:05 am) vic8 (Apr 12, 2006 1:55 pm) Mr_Shiftright (Apr 12, 2006 2:29 pm) and 1 more...
#34 of 151 Re: Service Engine Soon Light is back on again [vic8] by Mr_Shiftright HOST Apr 12, 2006 (8:05 am)
Replying to: vic8 (Apr 11, 2006 6:13 pm) YOu were fooled by the code. The code doesn't identify the defective part. No onboard computer can yet do that. It just identifies the circuit with the problem. So you need to start a diagnostic "tree" on that circuit and eliminate each component in the circuit by testing. Your 02 sensor was probably stressed out by some other defective function, so putting in a new one was possibly just providing a fresh victim for the real culprit. Replies to this message: vic8 (Apr 12, 2006 1:55 pm) Mr_Shiftright (Apr 12, 2006 2:29 pm) vic8 (Apr 13, 2006 11:35 am)
#35 of 151 Re: Service Engine Soon Light is back on again [Mr_Shiftright] by vic8 Apr 12, 2006 (1:55 pm)
Replying to: Mr_Shiftright (Apr 12, 2006 8:05 am) Thank you for getting back to me.When I originally read the trouble code it pointed to the oxygen sensor,but after it finished running through all the other systems it came to the end and left me with a PCM?.Could this be that, the problem is somewhere in the PCM circuit? Today I had a friend of mine put his code meter on and came up with the same P1139 code oxygen sensor,his meter did show another code that was not showing up on the cars computer.The code he read said #6 cylinder has miss fired. Could this possibly be the problem,thats causing the oxygen sensor to go bad?Thanks Again! Replies to this message: Mr_Shiftright (Apr 12, 2006 2:29 pm) vic8 (Apr 13, 2006 11:35 am)
#36 of 151 Re: Service Engine Soon Light is back on again [vic8] by Mr_Shiftright HOST Apr 12, 2006 (2:29 pm)
Replying to: vic8 (Apr 12, 2006 1:55 pm) Hmmm....tricky question, like the chicken and egg question...if the 02 sensor is bad, it can't tell the computer how to adjust the fuel mixture, so THAT could cause a misfire....but can a misfire cause a bad 02 sensor....I don't think directly, but a bad misfire could overheat the catalytic converter and THAT could eventually cause the 02 sensor to become contaminated I believe.   So the short answer....I don't know for sure. This is where thorough diagnostics comes in. Replies to this message: vic8 (Apr 13, 2006 11:35 am)
#37 of 151 Re: Service Engine Soon Light is back on again [Mr_Shiftright] by vic8 Apr 13, 2006 (11:35 am)
Replying to: Mr_Shiftright (Apr 12, 2006 2:29 pm) Thanks again for your help.I think I'm going to change the plugs,take out the new sensor I installed four months ago clean it up,put it back in, then clear the sensor code and cross my fingers,arms,legs,eyes and what ever else you can cross ha ha! Thanks again Buddy!
#38 of 151 95 DeVille just won't start by camillianite Jun 08, 2006 (4:39 pm)
This is a 95 Cadillac DeVille with the 4.9L V8 that was running well and then one morning it would not start. It will turn over strong when the key is turned but it won't fire. Pulled the fuel line just before the fuel regulator and the fuel comes out strong when turning key to start. Checked the fuses that had to do with the ignition and fuel injectors and they check good. I pulled the plastic cover off the distributor and found what looked like the coil. Checked the plug and contacts and there is no voltage to the coil when turning key to start position. I went ahead and made a guess to change out the ignition module inside the distributor housing and that did not fix it. I have checked the codes and the codes I have recorded are as follows: P052 P065 I039 I052   Could someone give me an idea where to go from here???? Thanks in advance for any ideas. Replies to this message: stevewhit (Jun 19, 2006 4:08 pm)
#39 of 151 Re: 95 DeVille just won't start [camillianite] by stevewhit Jun 19, 2006 (4:08 pm)
Replying to: camillianite (Jun 08, 2006 4:39 pm) On our '91 it was the security key system. Had a broken wire going into the switch assembly. Had to read the key resistor with an ohm meter to get the value. Hooked up a set of resistors to match that value to the cable going to the computer. Works like a champ. Other fix is a complete new switch assembly, as per the dealer. The indication was the "security" light was on. Hope this is not your problem. Best Steve
#40 of 151 GUYS by geo9 Jun 23, 2006 (12:53 pm)
You should look for a corroded or loose battery cable end...............

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