Probe project wiring noob

[Bob90lx]

Hey all;
I'm looking for someone experienced in wiring the SHO into other applications to help me with a few questions, if you don't mind.
I'm getting ready to try and wire my SHO out of a '92 mtx into my '90 probe LX. The probe originally came with a vulcan 3.0. Probe wiring diagram can be found here http://forums.probetalk.com/showthread.php?t=1701298756 (adobe required). I'm pretty sure the diagram for the 3.0 is around page 99-100. My idea so far is to reuse the probe ircm, since I'll be tying into the probes cooling fan, and main fuse box. I'm also using the probe transmission.
Could someone give me a hand in figuring out which wires require special attention from the sho ecu? I don't see any labelled vehicle power on the probe ecu, and the closest I could find is the pin 1 labelled room fuse. I'm assuming that probably means it gets power via the room
fuse in the fuse panel? I noticed there are 3 seperate pins on the SHO PCM labelled vehicle power. I believe they are 1,37, and 57. Can I tie the room fuse wire into pin 1 on the sho, and just splice off that wire for 37 and 57 as well?
Also, any idea which pins I should be running to my ircm from the PCM? Any and all help is greatly appreciated, as I'd really prefer not to toast a PCM or icrm. Thanks!

 

[firebat45]

I forget which pin off the SHO runs the IRCM, but I can offer some advice on the power wires.

Pin 1 needs power at all times, even with the ignition off. Pin 37 and 57 need to be on with the ignition on. I don't know if either of those correspond to the room fuse. I'll post some pinouts of the X2J for you when I get a chance, my DVD is at a different house.

 

[rubydist]

you should use the SHO pcm and modify wiring to the Probe chassis, not the other way around. the pcm is programmed for the proper spark timing and fuel delivery for that engine, and the 3.0 vulcan and the SHO motor will be significantly different in that regard.

 

[Bob90lx]

The plan is to use the SHO PCM. And the probe ircm. The SHO just wouldn't run off the speed density program of the Vulcan PCM. It seems plausible that I'd be able to use the engine management of the SHO PCM with the accessories managemet of the probe ircm, though. Am I way off base here?

 

[LOUDSHO92]

I would not use the Probe tranny as the SHO MTX transmission is the upgraded version of the Probe tranny.

The SHO's CCRM are year specific so it might be better to use the SHO CCRM and see if you could get it to turn on the Probe fans.

 

[firebat45]

I would not use the Probe tranny as the SHO MTX transmission is the upgraded version of the Probe tranny.

The SHO's CCRM are year specific so it might be better to use the SHO CCRM and see if you could get it to turn on the Probe fans.

Actually, if he's going to be rewiring (and he will) it's probably best to replace the CCRM with relays. That way parts are available at every automotive store and one failed relay won't require the replacement of the whole lot. Failing that the SHO CCRM is a better choice than the Probe one.

 

[Off Road SHO]

Yeppen, what FireBat said. Just figure out what high amperage devices you need to feed and buy a separate 20-40 amp relay for each. The SHO's PCM will send out a ground on the related pin to trigger the relay. It's best to be free of the CCRM's if you're doing the custom jobs.

Tom

 

[Bob90lx]

I would not use the Probe tranny as the SHO MTX transmission is the upgraded version of the Probe tranny.

The SHO's CCRM are year specific so it might be better to use the SHO CCRM and see if you could get it to turn on the Probe fans.

The probe tranny allows me the benefit of reusing 3 mounts, a stock speedometer that actually works, and probe driveaxles.
Perhaps you can help me understand the relationship between the PCM and CCRM a little better. How many pins from the PCM actually send signals to the CCRM? And which ones would they be? The wiring diagrams between the probe and sho CCRM look basically identical. They have the same model number, with the exception of one letter at the end being different.

 

[Off Road SHO]

I don't have the EVTM to the 92 SHO but in the 91's it went something like this:

EECIV Pin CCRM Pin

1 8 Both Hot at all times

41 11 Fuel Pump

54 22 May be AC cutout relay

55 14 May be fans

19 5 Both to fuel interupt switch in truck

There are more wires connect to both devices of course. You need to find the EVTM to the 92 SHO and the year probe you have.

Tom

 

[Bob90lx]

Well thanks for all the help and input so far guys, I appreciate it. I use relay logic and controls all the time when wiring boiler/heating systems. This seems similar, but much much more complex.
I've never wired up an engine before, but it's all mounted up and I've come to far to turn back now!
:thankyou:

 

[warmonger]

forget stock ecu's and go megasquirt. if you've been on probetalk you've noticed how strong the support for megasquirt is there. if you're using the vulcan 5 speed maybe look into swapping in 1g gt internals. They'll handle way more than a unboosted yamaha can dish out.

 

[EZ56]

Funny, I'm on PT as well. I've owned probes for about 5 years now

 

[Bob90lx]

Funny, I'm on PT as well. I've owned probes for about 5 years now

Cool, man. Then you're well aware of lance humberts sho probe from years past. That's why I know it can be done. The question of whether I can do it remains to be answered...
I post more on PP, but I've been pretty quiet about my project on those forums. I'd rather make a post of a running SHO probe video, than another "SHO swap" thread. There are a ******** amount of those on both sites as it is.

 

[Bob90lx]

Oh. My. God. I can't believe what I found tonight. I feel so stupid that my nervousness of tackling electrical systems has made me overlook such a stupid thing. After discussing this a little I looked into the function of the room fuse. For the last long while my cars stereo and interior lights haven't worked. The room 10A fuse was blown. Ugh, I'm stupid. Oh well, at least I found it. Better late than never.
I think I am going to trace out where the outgoing wires from the high amp side of the CCRM relays go for the Taurus and the probe seperately, then using the Taurus CCRM and ECU, splice the appropriate wires to the cooling fan, etc. and try to have the Taurus CCRM running the probe accessories. The configuration of the pins are literally identical between the two CCRMs so I'm thinking that it may not be as big of a headache as I thought.
I have a donor Taurus sitting outside my garage, so alot of the wiring will be just carefully labelling the wires to the pins they connect to, and reattaching them in the probe.
Does anyone have a specific pin out diagram for both the EEC and CCRM for a 92 MTX? It's my understanding that there are small differences between them year to year, and I haven't yet located one specifically for a 92 mtx. If not, no worries, I'll just suck it up and order the shop manual off eBay or something.

 

[warmonger]

i'm on PP and PT and mx6.com. i've had 16 total. good luck with this!

 

[probe_racer]

question so do the 1991 to 1995 taurus have the same ecu and ccrm??? since it seems that they can be interchanged on mtx sho's.

it seems this sho probe projects are more complex than anticipated.

thanks for any input sho gods

 

[LOUDSHO92]

The ECU's can inter change but the CCRM's can not.

 

[firebat45]

question so do the 1991 to 1995 taurus have the same ecu and ccrm??? since it seems that they can be interchanged on mtx sho's.

it seems this sho probe projects are more complex than anticipated.

thanks for any input sho gods

1989 to 1995 MTX SHOs can all use the same ECU pinout. ATX SHOs use a different ECU pinout. There's a couple variants of each, you want the X2J if at all possible. CCRMs are not compatible across all years, another reason to just get rid of it completely.

Here's a pinout of the ECU, sorry it took me so long to get it uploaded:

 

[jelloslug]

A quick note about the EEC wiring: even though it's not listed pin 34 on any MTX EEC is for the Fuel Flow connection on the digital cluster. This is what supplies the MPG readings to the digital cluster computer.

 

[Bob90lx]

sorry to revive an old thread. but im having some issues, and i thought i could really use some input. I labelled the connectors that connected to the engine before pulling the SHO out of the Taurus. Now I've got a connector on the wiring harness, and apparently no male end to plug into anywhere. It's going back a year now to when I pulled it out, so it's impossible to remember exactly where it came from.
I did a continuity check on the pin in the connector, and it goes back to the PCM at pin 18. The diagram above in this thread shows this being a PK wire, and in fact it's a grey wire. It's listed as the Octane adjust switch. What purpose does this serve, and where should the connector be that it plugs into? Im basically trying to methodically go through the list on the PCM pin out diagram and check off all of the pins that are accounted for. The SHO has ALOT more complexities and options than the probe, and all I need the PCM to do is basically run the engine. That said, I guess I'm also looking for some info on which pins are neccessary, and which are not for the operation of the engine?
Any and all help that anyone could provide would be much appreciated! :thankyou: