jndnaps

TPS and ICM Question

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22 hours ago, BodybyFisher said:

Yes with the key in run position or engine idling.  

Personally I think it is best to TEST voltages first, that is quick easy and gives us information.

You  need to test for voltage at 3 fuses in the underhood fuse center

PCM (IGN)

IGN 0 (ENG)

DISTR

OK, here's what I got with the key in, not running. 

PCM (IGN)  - 11.74 both sides

IGN 0 (ENG) - 11.73 both sides

DISTR - 11.74 both sides


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Ok, that is good.  That was expected.  I will come back shortly, with the next location to check.  


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/

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On the PCM, with the key on as before, I want you check the voltage at C1 pin 19, it should be around the same voltage.

Then test C1 pin 18

Do you know which connector is C1?, if not let me know.

Record the voltages and report them here.

Your battery is getting low at 11.7, if you have a trickle charger connect it


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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The connectors to the pcm should have a label on the side of them and the first number on one side correlating to the letter, and the last number on the other side


GM FAN FOREVER

Nice, clean, luxury= fine automobile

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On the PCM

CONNECTOR C1 = BLUE

CONNECTOR C2 = CLEAR

I posted a photo of C1, BE SURE you probe the correct pins 

15399210884127492656893185615897.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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19 hours ago, BodybyFisher said:

On the PCM, with the key on as before, I want you check the voltage at C1 pin 19, it should be around the same voltage.

Then test C1 pin 18

Do you know which connector is C1?, if not let me know.

Record the voltages and report them here.

Your battery is getting low at 11.7, if you have a trickle charger connect it

OK, am I unplugging the C1 Connector from the pcm, or can I test this plugged in? 


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I don't know that answer as I don't have a connector in front of me.

However, I kind of doubt that you can back probe the connector, I doubt that they would permit moisture intrusion from the back.  

So yes, remove C1 and test pin 18 and pin 19 for power.  I am hoping you find a voltage drop at pin 19.  Do this with the key on.

Before you reconnect the connector post your findings here.  I might want you to test resistance between pin 19 and fuse PCM (IGN) to test the integrity of splice S124.

 

P16340001.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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25 minutes ago, jndnaps said:

OK, I get:

11.45 on 19

0 on 18

 

Wow!  you just found your problem sir!  Good for you.

Ok, terrific, the drop is on 18, 

 This indicates to me that the splice S124 is good and not responsible.  

And I am pretty sure that this is responsible for your idle problems (well 95%) sure

If you look at the diagram above, C101 is a connector.  We need to inspect CKT 147 a Lt. Green wire for connector C101 for white/green corrosion.  You checked for power at the IGN 0 (ENG) fuse and have power.  

Now we need to pull that connector apart and check for power there and inspect the condition of the connectors!

I'll check the manual and see where C101 is located and come back.

Good for you! Have a beer!


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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21 minutes ago, BodybyFisher said:

Wow!  you just found your problem sir!  Good for you.

Ok, terrific, the drop is on 18, 

 This indicates to me that the splice S124 is good and not responsible.  

And I am pretty sure that this is responsible for your idle problems (well 95%) sure

If you look at the diagram above, C101 is a connector.  We need to inspect CKT 147 a Lt. Green wire for connector C101 for white/green corrosion.  You checked for power at the IGN 0 (ENG) fuse and have power.  

Now we need to pull that connector apart and check for power there and inspect the condition of the connectors!

I'll check the manual and see where C101 is located and come back.

Good for you! Have a beer!

The way I'm feeling right now I need a few shots of whiskey.. 

Edited by jndnaps

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Correct!  I transposed 18 for 19.  I edited my post above.  Please correct the reference in your post above or delete it if you can so there is no confusion.

Here are the scans of C101's location, pull that connector apart and check for power at the Lt. GREEN wire coming from the fuse center and inspect the pins on both sides.  

20181019_144315.jpg

20181019_144415.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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Lucky I checked there are 2 Lt Green wires in that connector (of course there are!)

Here is a scan of connector C101, you are looking at Pin (cavity) D / CKT 147.  

Enjoy the whiskey!

20181019_145534.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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Looks like it.  You have the connector layout above.  Look at the colors in the layout and then look at that connector, they should agree.

It probably is the connector.  And.... it is sitting straight up and can be back probed, no doubt water got in there


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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BINGO!!!!

Problem solved, broken wire.  

Proper fix, twist, solder, shrink wrap, tape.


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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A couple of other wires look bad also, am I seeing that correct?


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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3 minutes ago, BodybyFisher said:

BINGO!!!!

Problem solved, broken wire.  

Proper fix, twist, solder, shrink wrap, tape.

I may need to add some wire to that unless I can reroute it to splice it. How about using a Butt Splice? 

2 minutes ago, BodybyFisher said:

A couple of other wires look bad also, am I seeing that correct?

Yes, the red one looks worn. Not sure if they've been chewed on though. There was some old black tape wrapped there. I had to scrape that off to see the other end of the green wire. 


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I get the impression you are not going to keep the car that long so any way you can securely join that wire is good. I am not a fan of crimp connectors unless it is also soldered (because of corrosion potential and looseness). 

See what you can do.

When you are done, disconnect the NEG (-) battery connector to erase codes, reconnect and start it, see if P1634 goes away and how it drives 


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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Just remember that dew makes everything wet every night encouraging corrosion over time, so a moisture proof solid connection is preferred.  For the time being a solid crimp or wire nut will work fine.


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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7 minutes ago, BodybyFisher said:

I get the impression you are not going to keep the car that long so any way you can securely join that wire is good. I am not a fan of crimp connectors unless it is also soldered (because of corrosion potential and looseness). 

See what you can do.

When you are done, disconnect the NEG (-) battery connector and start it, see if P1634 goes away and how it drives 

 

1 minute ago, BodybyFisher said:

Just remember that dew makes everything wet every night encouraging corrosion over time, so a moisture proof solid connection is preferred.  For the time being a solid crimp or wire nut will work fine.

Yeah, I have a soldering iron and solder. I just gotta find where I put the solder. Just looked in my toolbox and don't see it there. I'll ask my neighbor when he gets home.. Maybe he has some. If not I'll just do a twist on it just to see if it's working. I just discoed the battery so I'll try and do the splice before I hook it back up. Hopefully that was the problem. Thanks for all your help!  :)  


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Glad to help, I love this stuff!

Let me know how it works out, I am very curious as to whether this fixes your problem or whether this is a redundant connection. 

Remember rosin core solder for electric not acid core (just a reminder).


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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So, the check engine light is off. No more 1634 and no more check electrical system message. But, the high idle is still there. 

Current Codes: P2511 - P2515 - C0073 - PZ2255 

Went for a quick ride. The idle is around 1800 when stopped at a light, and when I got home and put it in park it jumped to 3300.  RrRrRrRrRrRrr


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Ok.  Check to see that the throttle linkage is closing all the way.

Look in the throttle body plate to see if there is ANY air space.  There should be none.

Take a 3 foot hose and put one end up to your ear and listen to the passenger side of your intake for air sucking.  I doubt this is a vacuum leak because you dont have lean codes

I am leaning (no pun intended) toward a cable linkage problem, make sure it is solidly on the stop and the plate is closed.

Those are your only codes?  Those are B codes not P codes, so you have no powertrain codes.  


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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7 minutes ago, BodybyFisher said:

Ok.  Check to see that the throttle linkage is closing all the way.

Look in the throttle body plate to see if there is ANY air space.  There should be none.

Take a 3 foot hose and put one end up to your ear and listen to the passenger side of your intake for air sucking.  I doubt this is a vacuum leak because you dont have lean codes

I am leaning (no pun intended) toward a cable linkage problem, make sure it is solidly on the stop and the plate is closed.

Those are your only codes?  Those are B codes not P codes, so you have no powertrain codes.  

How do I check? Car running with the MAF off? or remove the hose to MAF and look through the screen? I need just a little more directions on how to do things. LOL..  It seems like the linkage is closing. I also pulled up on the gas pedal to see if that does anything and it didn't. 

I still can't get these codes into my little brain. If they're B codes, why does the computer say IP2511? Just can't figure that poop out. It should just say B2511.. I guess that's just too easy.. LOL.. I don't know, I'm dumber than a box of rocks.. LOL..  


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