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Driving from South Carolina..Some Issues


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Hello everyone while I am on way back from Mrylte Beach with my Cadillac and I am getting a Emission system Error everytime I shut the car down and start it back up again. The display says service emission system. Also I had to disconnect my IAC and I am now driving with the IAC closed. Has this hever happen to anyone else and if so what was the fix? It will back fire on take off and then go into limp mode. I had to stop a bunch of times to disconnect the battery to reset the computer in order to continue driving because it went into limp mode. After resetting the computer the car will run 400 miles straight with no problem but after i turn the car off and restart it it goes back into limp mode. I have changed every sensor in the car and I am still having this issue. I am currently in Virgina heading a back to New York. FYI.... I ran all levels of octane gas on my trip and the car runs best on 89 with 450 miles to the tank. and I know this becuase I got a speeding ticket on my way back.

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Push and hold the "off" & "warmer" buttons on the climate control panel and see what codes appear in the digital information center. Post the codes.

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Thanks for the reply...I just ran that test which I never even knew about and it displayed "Trans Fluid Reset"....Any Ideas??? Thanks

There were no numbers? Are you sure you did it right? Go here: http://www.caddyinfo.com/readingcodes.html then report back.

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Does anyone know how to reset these codes using the OBD for my 96 seville? Thanks

When it gets to "pcm?" use the fan high/low button to answer. Fan high = yes, fan low = no. Toggle through until you get to "clear codes?" and fan up for yes and the codes for the Pcm will be cleared. You have to do it for each of the other codes. A fan low after "pcm?" will go to the next codes. Turn key off to quit. Drive it for a while and see what comes back. The codes are defined here: http://www.caddyinfo.com/1996stsdtclist.htm

P0122 - Throttle Position (TP) Sensor Circuit Low Voltage - check wiring to the TPS

P1122 - Throttle Position (TP) Sensor Circuit Intermittent Low Voltage - check wiring to TPS

P0603 - Control Module Long Term Memory Reset - Battery was unhooked and set this code

The other codes are probably related to battery being unhooked. I would focus on the TPS.

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Ok thank you very much. One problem I know of is with my Idle control module. The computer will not change the position of the Idle. Sometimes it keeps it at 2,000rpm and I have to manually change the IAC. Are th IAC and the TPS connected in anyway or are these 2 separate issues.

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On my 94 the TPS is located on the left side (front side) of the Throttle body. The ISC (Idle Speed Control) actuator is located on the right (back) side of the TB. They are directly related. A faulty ISC and/or TPS will cause a variety of driveability problems. The TPS allows the PCM to control the idle speed depending on when the ISC touches the throttle lever. It may be different on a 96 though. I would check the wiring to the TPS first.

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Here is a thought we just stopped and i looked at the fuse box under the hood and there was a good amount of coorosion and build up in the fuse box and around the PSM fuses. I swapped out the fuse for the PSM with a new one and no codes were thrown. Has anyone else experienced it and could this have been the source of all my issues?

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Yes, intermittant power can cause fits with codes setting. Didnt you replace your TPS at some point, if I recall?

The P0603 tells me that you are having intemittant power IF you did not disconnect the battery and THAT could be caused by corrosion in the relay/fuse center.

Did you arrive at your destination yet?

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Yes, intermittant power can cause fits with codes setting. Didnt you replace your TPS at some point, if I recall?

The P0603 tells me that you are having intemittant power IF you did not disconnect the battery and THAT could be caused by corrosion in the relay/fuse center.

Did you arrive at your destination yet?

I have been disconnecting the battery to clear it from " limp mode " as I traveled back to NY from SC.. We drove 500 miles after I cleaned the fuse panel a bit and reset the computer and erased all codes from within the car.. %00 miles no codes no issues at all! This is rather exciting! I have replaced the TPS, 3 times actually trying to track down the source of this! I now have a new question... At what speed and gear does the torque converter lock up at?

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The TCC clutch will engage in any gear. The car must be going over 41 mph and the throttle must be released to let the engine RPM down to the right range and the TCC will engage imperceptibly, thus you will always see it in 4th unless you pull down the shift to 3 or 2; I haven't tried the TCC in 1st gear but it definitely will engage in 2nd gear. The best way to check it, other than looking for the infamous TCC OBD codes, is to drive at a constant 50 mph or so on a level road at light throttle, and look and see if the engine RPM holds with the tach as you make small corrections of the throttle. If you press down on the gas more, the TCC will release and the engine RPM will go up 500 or so, and the torque converter will give you more oomph without a downshift, although it feels a little like a downshift when this happens.

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The TCC clutch will engage in any gear. The car must be going over 41 mph and the throttle must be released to let the engine RPM down to the right range and the TCC will engage imperceptibly, thus you will always see it in 4th unless you pull down the shift to 3 or 2; I haven't tried the TCC in 1st gear but it definitely will engage in 2nd gear. The best way to check it, other than looking for the infamous TCC OBD codes, is to drive at a constant 50 mph or so on a level road at light throttle, and look and see if the engine RPM holds with the tach as you make small corrections of the throttle. If you press down on the gas more, the TCC will release and the engine RPM will go up 500 or so, and the torque converter will give you more oomph without a downshift, although it feels a little like a downshift when this happens.

Cool thats what I thought.. I been getting parinoid making sure all is working well! I think overall after I get this fuse panel set I think the car will be golden! This is the first time I took a long trip in a cadillac and honestly It was the most comfortable and effortless ride ever... Few bumps along the way but thats the way you iron out the bugs i guess! Thanks for all the help everyone!

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Turn up your radio, turn off the DIC, and RELAX AND ENJOY... :lol:

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Turn up your radio, turn off the DIC, and RELAX AND ENJOY... :lol:

Well, Issues started again today, P1122 error, and idle goes up to 1700+.... Cleared codes, didnt change a thing, code keeps coming back. Had to disconnect the IAC and set the idle myself so I dont blow the tranny. What are the voltages at the TPS? Is there a scematic I can follow to check all of this?

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Five, here is the P1122 detail from the FSM, Mike

P11221.jpg

<br>

P11222.jpg

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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No problem Tony glad to help, by the way my name is BODY-BY-FISHER, not Bobby, :lol: Mike

Here is a little history of BodybyFisher, when I was a kid, all GM cars had a Body by Fisher lable clearly visible when you opened the door

http://en.wikipedia.org/wiki/Fisher_Body

I am driving to Charlottesville, Virginia and Columbia, South Carolina over the next couple of weeks

BBF.jpg

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Ok, here are my findings for today... I disconnected many wiring harness's and found the one near the top of the trans ( rectangular shapped with blue safety holdowns ) would not come appart.. After some wd40 and a few screwdrivers its popped off... It was completely covered in Green Copper corrosion.. got a file, cleaned up the connections, sprayed and Lubricated all the connections, replaced and checked voltage thru the harness connection... Seemed to be at 12V... the one that was heavily corroded was the thick red power source wire. Then i removed all the large fuses and they too where corroded as hell! Cleaned and replaced. I also cleaned the circle connecion near the tranny fill dip stick, that one was spotless and clean. Started the car cleared the codes, all seemed good. idled where it should etc. I did however notice one thing now since the cleaning. My Battery voltage reads 11.9V when the car is on as opposed to what it did before 13.8V... Now I am hoping I didnt create a new issue. So my ? is, where is everyones voltage when running? I am about to go test drive the car now with. Be back in a few..

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Ok, here are my findings for today... I disconnected many wiring harness's and found the one near the top of the trans ( rectangular shapped with blue safety holdowns ) would not come appart.. After some wd40 and a few screwdrivers its popped off... It was completely covered in Green Copper corrosion.. got a file, cleaned up the connections, sprayed and Lubricated all the connections, replaced and checked voltage thru the harness connection... Seemed to be at 12V... the one that was heavily corroded was the thick red power source wire. Then i removed all the large fuses and they too where corroded as hell! Cleaned and replaced. I also cleaned the circle connecion near the tranny fill dip stick, that one was spotless and clean. Started the car cleared the codes, all seemed good. idled where it should etc. I did however notice one thing now since the cleaning. My Battery voltage reads 11.9V when the car is on as opposed to what it did before 13.8V... Now I am hoping I didnt create a new issue. So my ? is, where is everyones voltage when running? I am about to go test drive the car now with. Be back in a few..

OH NO, don't use a FILE..... Use Electronic Contact Cleaner. I think you are talking about the injector connector. GREEN IS BAD, good find. WOW, lots of corrosion you found.

Step up your IDLE and see if you go up from 11.9 volts. When running, I am around 13.2 when the battery stabilizes. What is your IDLE RPM?

NEVER FILE OR SAND electrical connectors, but some electrical contact cleaner.

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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ok well here is my finding after the drive... drove the car 10 miles. No codes... shut it down 3 times or so... No codes.. I was happy... got it home decied to clean my wheels, started it up, code central, IP1910 ( instument panel code ) , PC1599( near stall- which I am causing from manually setting my IDLE low ) PC0122 and PC1122 ... As the car idled, it started slowing going from 500rpm to around 1700rpms slowly.. I went out disconnected both the TPS and IAC checked voltages and found 5V with a good ground at the TPS and 12V at both power leads at the IAC with grounds... WHAT THE HELL GIVES! So where back at square 1... The Battery Voltage went back to normal all is well there... So it seems to me, that the devices are getting the power they need, the PCM just doesnt know what the hell to do. I would figure if it was an wiring issue, it would never just work then not work without just shutting down and restarting correct? I called my cadillac dealer today they told me PC0122 and PC1122 are very unusual codes and not common. He said it could be a flaky PCM. Oh something I should add... It comes up as a " current " error not a history.

Next order of business, how do I gain access to the PCM? I see it in the air box, I have a cold air intake so it open for view. It says to remove screws to lift the top half of the cover, well I dont see any screws. How do I get that off?

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Well, drove the car 150 miles tonight, still giving me codes, and now the cruise control doesnt work... For sure now I am leading towards wiring issues.. I have definetly disturbed something for sure...

Go and BUY Electrical Contact Cleaner, and spray ALL if the connectors you took apart and let me repeat do not use any kind of sand paper, files, etc on the connectors it can make things worse, the only think you should use is a nylon detail brush with the cleaner. Green corrosion will cause fits, Mike

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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