A-man930 Posted October 9, 2008 Share Posted October 9, 2008 I have a new appreciation for the saying about ASSuming things... I'm retarded. The wiring harness I pulled is from a '96 XJ, I ASSumed it would work just fine on my '95 H.O. that I'm putting in my '90 MJ. Well this doesn't seem to be the case :wall: But in hopes of not making another un-informed purchase/sale, I would like to find out for sure that there is no way I could get the '96 unit to work. As stated, the ECU and complete engnie harness is out of a '96 AW4-equipped XJ, its supposed to run a '95 H.O. in my Comanche. I don't particularly want to re-use my RENIX manifolds on the H.O. motor, I'm aware that is an option. If I'm really not able to splice'n'dice to make the '96 stuff work, then exactly what harness/ECU do I need to look for to make my swap work in the easiest way possible? Thanks guys Link to comment Share on other sites More sharing options...
Eagle Posted October 9, 2008 Share Posted October 9, 2008 The '96 is a mongrel. That was the first year they went over to OBD-II, and the way they did it was sort of bastardized because it was adapted into the 91-95 chassis harness. The '97+ was an all-new harness. You need a harness from something in the 1991 to 1995 range. Link to comment Share on other sites More sharing options...
Pete M Posted October 9, 2008 Share Posted October 9, 2008 Yeah, while it might be possible to adapt it, I would personally seek out the 91-95 harness. You could be looking at a lot of time to fiddle the OBD-2 in. And even if you're successful, then you'd have OBD-2 and who wants that? :D Link to comment Share on other sites More sharing options...
Sir Sam Posted October 9, 2008 Share Posted October 9, 2008 Yeah, while it might be possible to adapt it, I would personally seek out the 91-95 harness. You could be looking at a lot of time to fiddle the OBD-2 in. And even if you're successful, then you'd have OBD-2 and who wants that? :D in and of its self there is nothing wrong with the 96 OBDII setup. Link to comment Share on other sites More sharing options...
Sir Sam Posted October 9, 2008 Share Posted October 9, 2008 I have a new appreciation for the saying about ASSuming things... I'm retarded. The wiring harness I pulled is from a '96 XJ, I ASSumed it would work just fine on my '95 H.O. that I'm putting in my '90 MJ. Well this doesn't seem to be the case :wall: But in hopes of not making another un-informed purchase/sale, I would like to find out for sure that there is no way I could get the '96 unit to work. As stated, the ECU and complete engnie harness is out of a '96 AW4-equipped XJ, its supposed to run a '95 H.O. in my Comanche. I don't particularly want to re-use my RENIX manifolds on the H.O. motor, I'm aware that is an option. If I'm really not able to splice'n'dice to make the '96 stuff work, then exactly what harness/ECU do I need to look for to make my swap work in the easiest way possible? Thanks guys Why exactly won't it work? if you have the ECU to match it everything else should plugin and matchup on the 95 engine - I am interested to know what is different such that it will not work. Link to comment Share on other sites More sharing options...
Pete M Posted October 9, 2008 Share Posted October 9, 2008 Yeah, while it might be possible to adapt it, I would personally seek out the 91-95 harness. You could be looking at a lot of time to fiddle the OBD-2 in. And even if you're successful, then you'd have OBD-2 and who wants that? :D in and of its self there is nothing wrong with the 96 OBDII setup. Technically you are right. It's just a personal beef with certain vehicles and their OBD 2 systems I've owned over the years. :D Link to comment Share on other sites More sharing options...
jtdesigns Posted October 9, 2008 Share Posted October 9, 2008 Yeah, while it might be possible to adapt it, I would personally seek out the 91-95 harness. You could be looking at a lot of time to fiddle the OBD-2 in. And even if you're successful, then you'd have OBD-2 and who wants that? :D in and of its self there is nothing wrong with the 96 OBDII setup. Technically you are right. It's just a personal beef with certain vehicles and their OBD 2 systems I've owned over the years. :D I like OBD II is really easy to troubleshot by getting a code... Link to comment Share on other sites More sharing options...
Wildman Posted October 9, 2008 Share Posted October 9, 2008 Yeah, while it might be possible to adapt it, I would personally seek out the 91-95 harness. You could be looking at a lot of time to fiddle the OBD-2 in. And even if you're successful, then you'd have OBD-2 and who wants that? :D in and of its self there is nothing wrong with the 96 OBDII setup. Technically you are right. It's just a personal beef with certain vehicles and their OBD 2 systems I've owned over the years. :D I like OBD II is really easy to troubleshot by getting a code... :agree: Much easier to get a code to start trouble shooting, than just replacing sensors :roll: But, I'll agree that the harness you should get for your project should be from the '91-'95 HO era, which would be the OBD I system. Link to comment Share on other sites More sharing options...
A-man930 Posted October 9, 2008 Author Share Posted October 9, 2008 Looks like I've got a line on straight-up trade for a harness and ecu from an AX-15 equipped '91 MJ, couldn't ask for much better! Now, what compatability issues should I expect with this swap (wiring wise)? I'll have a '90 truck with a '95 engine and (soon) a '91 harness and ecu... are there any "extra" plug-ins/sensors/do-dads that'll I'll need to deal with?? Link to comment Share on other sites More sharing options...
HOrnbrod Posted October 9, 2008 Share Posted October 9, 2008 Looks like I've got a line on straight-up trade for a harness and ecu from an AX-15 equipped '91 MJ, couldn't ask for much better! Now, what compatability issues should I expect with this swap (wiring wise)? I'll have a '90 truck with a '95 engine and (soon) a '91 harness and ecu... are there any "extra" plug-ins/sensors/do-dads that'll I'll need to deal with?? Well, 91 was a bastard year in some cases too, the year they went from Renix to OBDI HO. I have found some little things that are not quite the same as the newer OBDI models, but they escape me at the moment. You should be okay, as long as the new harness and ECU match the engine and tranny you have, and the donor harness/ECU was NOT one that had the optional security system installed. I've been working with a guy on NAXJA who is having problems getting spark to the plugs being caused by a security system lockup electronic somewhere. And make sure you get the PDC too. Oh, and you can get the codes on OBDI systems too using the key trick. :cheers: Link to comment Share on other sites More sharing options...
mjeff87 Posted October 9, 2008 Share Posted October 9, 2008 Make sure you have the correct CPS and flywheel to match the harness. Look at the CPS connector on the harness, if it's round it's OBD1 and if it's flat it's Renix. You can't switch them, as far as I know but you can swap flywheels to match the correct CPS for the harness if your's isn't the same. Jeff Link to comment Share on other sites More sharing options...
Boilermaker Posted October 9, 2008 Share Posted October 9, 2008 Well, 91 was a bastard year in some cases too, the year they went from Renix to OBDI HO. I have found some little things that are not quite the same as the newer OBDI models, but they escape me at the moment. You should be okay, as long as the new harness and ECU match the engine and tranny you have, and the donor harness/ECU was NOT one that had the optional security system installed. I've been working with a guy on NAXJA who is having problems getting spark to the plugs being caused by a security system lockup electronic somewhere. And make sure you get the PDC too. Hopefully A-man will be using my old harnesses...ECU definitely matches tranny, i've kept everything together. Doesn't have the security system, should be ok there. I have the entire engine sitting on a stand along with most of the rest of what came out the engine bay in boxes. Is there anything else i can send along to make this swap easier? Link to comment Share on other sites More sharing options...
A-man930 Posted October 9, 2008 Author Share Posted October 9, 2008 What's the PDC? And IIRC the renix flywheel has a the reluctor for the CPS on it (at least that's what it looked like when I had my tranny out a couple of months ago...) what does the HO sensor use? Link to comment Share on other sites More sharing options...
HOrnbrod Posted October 9, 2008 Share Posted October 9, 2008 What's the PDC? And IIRC the renix flywheel has a the reluctor for the CPS on it (at least that's what it looked like when I had my tranny out a couple of months ago...) what does the HO sensor use? Power Distribution Center, #7 in the below. It's an electrical enclosure box that sits on the right inner fenderwell on 91+ HO models. It contains relays and fuses that you will have to wire in on your HO swap. If Boilermaker has the complete 91 harness, it should be included with the harness. Hopefully he'll also include all the sensors and mounting brackets so you can just plug them all in. I highly suggest investing in the electrical 1991 FSM too - it will be your friend. :cheers: Image Not Found Link to comment Share on other sites More sharing options...
A-man930 Posted October 10, 2008 Author Share Posted October 10, 2008 Gotcha. I'll be looking into finding one of those electrical FSMs soon. I talked to boilermaker yesterday and there's still a little confusion about what what exactly I'm going to need to get from him. Mainly its the dash harness that's in question... can I re-use mine or do I need the '91 piece?? And if not, is my '90 guage cluster going to be compatable? Link to comment Share on other sites More sharing options...
HOrnbrod Posted October 10, 2008 Share Posted October 10, 2008 Gotcha. I'll be looking into finding one of those electrical FSMs soon. I talked to boilermaker yesterday and there's still a little confusion about what what exactly I'm going to need to get from him. Mainly its the dash harness that's in question... can I re-use mine or do I need the '91 piece?? And if not, is my '90 guage cluster going to be compatable? I think you will be okay using your original dash harness. Worst case scenerio would be that you would have to match and splice the new harness wires on the the old male bulkhead connector pigtail. You'll need both model bulkhead connector pinout diagrams to do this. Doing it this way you could retain your cluster w. the mech speedo. The fuel gauge (different polarity) and tach are also different in the HO clusters. Link to comment Share on other sites More sharing options...
A-man930 Posted October 11, 2008 Author Share Posted October 11, 2008 I think you will be okay using your original dash harness. Worst case scenerio would be that you would have to match and splice the new harness wires on the the old male bulkhead connector pigtail. You'll need both model bulkhead connector pinout diagrams to do this. Doing it this way you could retain your cluster w. the mech speedo. The fuel gauge (different polarity) and tach are also different in the HO clusters. That is the best news I've heard in my entire life I swear... Somebody else agree with him Quick! lol Link to comment Share on other sites More sharing options...
A-man930 Posted October 12, 2008 Author Share Posted October 12, 2008 I would like one more person to verify what hornbrod is telling me before I let boilermaker know exactly what to send me... just to make me feel at ease Link to comment Share on other sites More sharing options...
ejndssn Posted October 12, 2008 Share Posted October 12, 2008 I would like one more person to verify what hornbrod is telling me before I let boilermaker know exactly what to send me... just to make me feel at ease you know when it feels right you just have to go with it. The information is available somewhere out there... that reminded me of the OZ(over the rainbow) :rotf: what do you have to lose if you give it a shot :brows: maybe a little :headpop: but "you can do it" another movie :rotfl2: good luck and keep us posted :cheers: Link to comment Share on other sites More sharing options...
A-man930 Posted October 17, 2008 Author Share Posted October 17, 2008 Ok, I got the harness earlier today and it looks 10000000% better. Big thanks to Boilermaker! Now I've only got a few loose ends to tie up! :D Here are a couple of plug-ins that I'm not sure about... I'm assuming that a couple of these will sort themselves out when I have it in the chasis, but if anyone has any advice that would be helpfull. Link to comment Share on other sites More sharing options...
FxRacing282 Posted October 17, 2008 Share Posted October 17, 2008 Yeah, while it might be possible to adapt it, I would personally seek out the 91-95 harness. You could be looking at a lot of time to fiddle the OBD-2 in. And even if you're successful, then you'd have OBD-2 and who wants that? :D in and of its self there is nothing wrong with the 96 OBDII setup. Technically you are right. It's just a personal beef with certain vehicles and their OBD 2 systems I've owned over the years. :D i would prefer an obdII over anything, then a carb and then OBDI, ive worked on all and carb is easiest. obdI is a pita and obdII is a joke. a todler can figure it out Link to comment Share on other sites More sharing options...
Pete M Posted October 17, 2008 Share Posted October 17, 2008 I prefer Renix. :D Link to comment Share on other sites More sharing options...
mjeff87 Posted October 17, 2008 Share Posted October 17, 2008 first pic, I didn't use either of those connectors. I think one of them is for the optional underhood light second pic, MAP sensor third pic, looks like the CPS connector to me but I'm not sure. Jeff Link to comment Share on other sites More sharing options...
A-man930 Posted October 17, 2008 Author Share Posted October 17, 2008 first pic, I didn't use either of those connectors. I think one of them is for the optional underhood light second pic, MAP sensor third pic, looks like the CPS connector to me but I'm not sure. Jeff I think you got the second and third pics switched... oh well. That connector I'm holding by the throttle body definately doesn't have a place to connect to. My wiring diagram for the '91 says I should have a MAP sensor. The crank position sensor is right at the back of the head, and I don't see a cam position sensor (only two cps sensors I could come up with :???: ) The only reason I'm asking these questions is I have to make sure this harness will work before I go tearing into doing the swap. I can only afford my truck to be down for so long unfortunately. Thanks again for all the help :cheers: Link to comment Share on other sites More sharing options...
mjeff87 Posted October 17, 2008 Share Posted October 17, 2008 cam position sensor is in the dizzy, the connector for it is in the secondary harness that goes to the alternator and starter, over by the relay center. If that's an HO harness, the CPS connector is round like your third pic. The renix CPS is flat (looks like the MAP connector). Look at your CPS and see what shape your is. Jeff Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now