1993 Cadillac STS wiring harness

Tiny
LELANDB01
  • MEMBER
  • 1993 CADILLAC STS
  • V8
  • FWD
  • AUTOMATIC
  • 13,000 MILES
I have done a head bolt to stud conversion on a cadillac seville sts 4.6 northstar. All is well with the exception of one misc. plug and I am getting no spark. The plug is a two plug wire that has a clip about 8 in from the end that looks like to clips to a fitting with a vacuum line protruding out of it. It comes out of the harness just about where the temp sending unit on the drivers side and has approx. 14" pigtail. I have looked at another sts and I am preety sure that the plug is somewhere between the firewall and the engine. I have had the damn eng out twice looking for the plug.


http://www.2carpros.com/forum/automotive_pictures/389334_Picture_014_1.jpg

The instrument cluster says no traction control when key is on it this helps. thanks p.s. I do have pictures of the two plugs.
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Wednesday, July 29th, 2009 AT 11:15 AM

19 Replies

Tiny
BUDDYCRAIGG
  • EXPERT
Tell me what color the wires are and i'll try to figure out what sensor it plugs into.

Hopefully knowing that will solve the problem.
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Wednesday, July 29th, 2009 AT 4:57 PM
Tiny
LELANDB01
  • MEMBER
The wres look like one solid yellow and the other solid brown
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Wednesday, July 29th, 2009 AT 7:48 PM
Tiny
FACTORYJACK
  • EXPERT
It goes down to the steering gear for the magnetic actuator. The clip goes on one of the steering gear transfer tubes(small fittings). That will not give you a no spark condition, but will give you a traction control light. Look down around the steering gear stub shaft and you should see the mating connector.
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Wednesday, July 29th, 2009 AT 10:19 PM
Tiny
BUDDYCRAIGG
  • EXPERT
Gstacey is probably correct on this one,

but i'm showing the colors to be white and brown.
Maybe the white wire is stained over the years.
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Wednesday, July 29th, 2009 AT 11:00 PM
Tiny
LELANDB01
  • MEMBER
Well you helped me with the wire, I still have no spark and am wondering which items to check for voltage and which order to check them.
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Thursday, July 30th, 2009 AT 5:00 PM
Tiny
BUDDYCRAIGG
  • EXPERT
Gstacey knows Cadis a lot better than I do. Hopefully he will have a magic answer for you.
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Thursday, July 30th, 2009 AT 6:30 PM
Tiny
FACTORYJACK
  • EXPERT
Did it run prior to the head bolt repair? The causes for no spark can be multiple, especially since the vehicle has had major service work. Do you have four connectors present on the ignition module. Are all the grounds attached. Did a terminal get damaged. If the vehicle ran before the repairs, then the problem was created, and normal diagnostic flow may not apply. For a starter, press off and warmer on the climate panel together, until a segment check, and then codes start displaying. We are concerned if there are any ecm codes(E0XX, P0XX). Lets see if there are any to give us direction. I don't have any 93 info at home where I do most of my corresponding, turnaround time may be couple days if on a weekend.
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Thursday, July 30th, 2009 AT 10:03 PM
Tiny
LELANDB01
  • MEMBER
Yes it did run. I know it is something that happened during removal and re-install. I have 4 grounds on block. The main ground and 3 others. I finally made sure the crankshaft position sensors were in since they were a pain to get to (removed front mount to troubleshoot them. I have power to one wire going to one of the four connector plugs going to coil pack (two of the plugs are small and two are wider, the power is to the one small plug that has 3 actual wires in it, the other only has 2 wires in it.
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Monday, August 3rd, 2009 AT 12:00 PM
Tiny
LELANDB01
  • MEMBER
I just checked codes and everything looked like history or current but pcm had? Behind it
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Monday, August 3rd, 2009 AT 12:34 PM
Tiny
FACTORYJACK
  • EXPERT
What were the pcm codes? After it goes through all the code display, it will display PCM, waiting on your next move.
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Monday, August 3rd, 2009 AT 9:41 PM
Tiny
LELANDB01
  • MEMBER
What do I go when the last display that shows pcm?
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Monday, August 3rd, 2009 AT 10:52 PM
Tiny
BUDDYCRAIGG
  • EXPERT
I'm so glad I stepped out of this.

My head hurts just reading it.
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Monday, August 3rd, 2009 AT 11:21 PM
Tiny
FACTORYJACK
  • EXPERT
Push fan up, it should either say pcm codes, or pcm clear codes. If it says 'PCM CODES' press fan up and document all codes it displays, and whether current or history. If it says 'PCM clear codes', push fan down until it says PCM codes and reference previous sentence. It should go through display of all codes when diagnostics are entered. Now let me ask you this, is this a 93 engine that has been put in a newer vehicle? The reason I ask is, in 93 I thought it was considered and termed an ECM.
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Monday, August 3rd, 2009 AT 11:26 PM
Tiny
LELANDB01
  • MEMBER
Well here goes, I hope I read these right. I think it reads PD at the begining of these codes (I won't put the PD infront of the numbers): 01=-13.9, 02=10, 03=92, 04=-40, 05=-38, 07=43, 08=15, 09=2.456, 10=.0, 11=0, 12=0, 13=0, no14, 15=11.9, 16=0001, 17=110, 30=.0,
31=.0, 32=.33, 33=.45, 34=0, 35=0, 36=128, 37=128, 38=128, 39=128, 40=.00, 41=0, 42=0,
70=18, 71=111, 72=0, 73=0, 74=.000, 75=1.035, 76=4.000, 77=19, 78=0, 79=0,
80=.000, 81=.0, 82=.000, 83=2, 84=0, 97=1305, 98=0, 99=1104. You guys are gonna get a better donation when this thing runs.
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Tuesday, August 4th, 2009 AT 11:28 AM
Tiny
FACTORYJACK
  • EXPERT
Somehow you got it in powertrain data(PD), which is possible if you select it. Just push off, and warmer, and read the codes as it displays. We want pcm codes, that should be the first to run after the segment check. Don't push any other buttons except off, and warmer. Read and report all the codes if you would like.
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Tuesday, August 4th, 2009 AT 9:59 PM
Tiny
LELANDB01
  • MEMBER
Heres the codes: p015=current, p032=history, p052=history, p109=history, I052=history, a012=current, no sir codes, no tcs codes, s044=history, s055=history, s061=history that's it.
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Tuesday, August 4th, 2009 AT 11:25 PM
Tiny
FACTORYJACK
  • EXPERT
That's what we are after, let me do some research on these and I will get back to you. It may be tomorrow evening.
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Wednesday, August 5th, 2009 AT 12:33 AM
Tiny
FACTORYJACK
  • EXPERT
I will tell you this much, the P015(open ect), and P032(open map), are two concerns. They will not get a no spark condition to my knowledge. Looking at the PD info you sent, your coolant temp reads -40(pd04), your intake air temp reads -38(pd05), and your throttle position -13.9(pd01). These are all indicative of open circuit. My guess is your lacking the 5V reference from the PCM. You can verify by checking for 5 volts on the yellow wire at the ECT connector, the gray wires at the MAP and TP sensors, and the tan wire at the IAT sensor. You could also have an open ground, but I wouldn't think you would have any PCM data at all, I am not positive. You have two fuses for power to the PCM, both are underhood, fuse B13, and fuse A9, both 10 amp. Check these fuses for power on both sides. The PCM ground is G102, it is on the lower portion of the engine block, by the trans extension housing at the RH axle. Make sure it is tight, and that the wrong bolt wasn't used(too long) and bottomed out before the ground got tight. Also make sure that all three PCM connectors are fully installed. Fuse A9 is probably fine, because your IGN 1 value(pd15) is 11.9 volts. There is also a connector involved that, if disconnected, will drop your 5V. It is C225, I cannot find a location on ALLDATA, but it should be near the PCM inside the vehicle. Just look for any connections not made at this point.
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Wednesday, August 5th, 2009 AT 1:15 AM
Tiny
LELANDB01
  • MEMBER
Well I checked voltage and found 10v not 5v on the ect, map, tp, and iat. I do have a plug that is only about 6 in. Long and for the life of me I see no place for it to plug in at (it has to be with in the 6in radius but nothing there) It seems dirty all over so not sure it was plugged into anything, however looking at the metal tabs they look like they had been plugged into something. I am attaching a picture. It has a light blue wire and larger r/w wire and a larger b/w wire. This I my last attempt with this. He will get put on a train and sent home and when he can afford it I will put it on a trailer and take to some who cares I'm about done. I hope you got picture. Oh the plug is located on the passenger side, it looks like it would barely reach where the harness goes through the firewall to the pcm.
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Thursday, August 6th, 2009 AT 1:42 PM

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