How to wire a SHO motor in something else.

[Off Road SHO]

Wiring the 3.2 SHO motor in The Other Woman

If you’re using the stock wiring harness, most of this information is not necessary. I removed the DIS from the crossover tube and moved it to the wiring box behind the passenger seat; along with the PCM, the new fuse panel and all the relays. Moving the DIS alone necessitated the running of many wires so that it could talk with the Crank Sensor, the Cam Sensor and the Coil Pack

Pin 1 of PCM needs to be hot at all times, preferably fed by the ignition switch or a relay switched on by the ignition switch.

The following needs to be hot in Run and Start:
Pins 37 and 57 of the PCM
The purple wire of both O2 Sensors.
All six fuel injectors on their red wires.
Idle Air Controller on its red wire.
MAF Sensor on its red wire
Intake Manifold Runner Control on its red wire
There are other devices that the red wire feeds power to but are not used on buggies: The CCRM (I used individual relays), The Charcoal Canister Purge Solenoid, The EGR Vacuum Regulator Solenoid

The following pins of the PCM send a ground signal to trip the injectors: Inj 1 pin 58, Inj 2 Pin 59, Inj 3 Pin 39, Inj 4 Pin 35, Inj 5 Pin 15, Inj 6 Pin 12

The Red/Green stripe wire needs to be hot in Run and Start and feeds the following devices in both the 3.0 and 3.2:
Crank Pos Sensor ( Connector 1058)
Cam Pos Sensor ( Connector 178)
Pin 1 of DIS ( Connector 156 )
Ign Coil Pack ( Connector 1018)
Radio Noise Suppressor capacitor ( Connector 1031 )

Pin 46 of PCM feeds Ref Voltage on the Gray/Red stripe wire to the following:
SPOUT #2 and back (to the PCM) on pin 29.
To the IAT Sensor and back on green/yellow wire to pin 25.
To the TPS and back on grey/white to pin 47.
To both O2 Sensors ( via connectors C1009 and C1008) and back on rd/bk and grey/light blue to pins 43 and 44.
To the Knock Sensor and back on yellow/red to pin 23.
To the ECT Sensor and back on light green/red to pin 7.
To Turbine Shaft Speed Sensor and back on grey / black to pin 5.
To the MLPS (on ATX PCM cars) and back on Light Blue/Yellow to pin 30.
The ATX PCM expects to see 3770-4607 Ohms on pin 30 if it is in “Park”
The ATX PCM expects to see 660-807 Ohms on pin 30 if it is in “Neutral”
The ATX PCM expects to see 190-232 Ohms on pin 30 if it is in “Drive”


Hope this helps the people building FrankenSHO's with the 3.2 SHO motor.

Tom

 

[mrecoolgar]

Thanks Tom.
I'm currently doing wiring research for the RX7 project.

 

[NovaSS]

This needs to be a sticky in the frankensho section

 

[Phoenix]

What he said :wave:

 

[93rev2sev]

Thirded.

 

[SHO1]

Forded!

 

[SHOCH]

I'll plead the 5th.

 

[Off Road SHO]

I'll try and add more later on.

Tom

 

[fa SHO]

is any of this info the same for the 3.0 mtx ecu?

 

[Off Road SHO]

I'm sure a lot of it is but I haven't had a need to research it since I mostly deal with the 3.2. The theory of course is the same.

Tom

 

[fa SHO]

anyone have the pinout for the 3.0 ecu?

 

[rbruso]

To the Knock Sensor and back on pin 23.
To the ECT Sensor and back on pin 23.

It looks like there's a typo in this list. Does the ECT come back on pin 7 like an MTX?

 

[firebat45]

anyone have the pinout for the 3.0 ecu?

Here you go!

I don't have the 3.2 diagram handy. It's quite a bit different, since they crammed all the EGR/Tranny stuff in there too. Definitely not pin-compatible, though you could make it work with some pin swapping.

 

[Off Road SHO]

It looks like there's a typo in this list. Does the ECT come back on pin 7 like an MTX?

I will check on it and get back on the thread.

Tom

Edit: Thanks for pointing that out; the ECT in fact reports back on pin 7, not 23. I corrected my original post. Thanks again.

Tom

 

[92sho16]

Alright so if i am using the stock harness which i guess im kinda rethinking but anyway for stock harness it seems like pins 1,37,and 57 are the only ones that need to be connected to +12V?

 

[Off Road SHO]

That is correct. Pin 1 is hot at all times, and 37 and 57 are switched hot while in start or run.

Tom

 

[RedDemonSHO]

hay does anyone have the pinout for the 3.2??? thanks

 

[Bob90lx]

Hope this question is thread appropriate, but when you refer to the red/green stripe wire needing to be hot in run mode, is that a seperate wire from the PCM? I've got the wiring tied in on my project with the stock PCM and SHO ccrm, and the engine turns over but no spark. I checked, and it looks like no power at all to the ignition circuit. I found a red/ green stripe wire that comes off the connector for the dis that mounts to the intake manifold, do I need to run another power wire to that to energize the ignition circuit, do you think?
Thanks again for this particular thread, as well as all other free info you've provided so far!

 

[Fordtaurussho]

doing a 3.2 swap, can i swap the wiring harness from the 95 atx into my 90 sho by hard wiring like you did into the other women?

 

[Off Road SHO]

Hope this question is thread appropriate, but when you refer to the red/green stripe wire needing to be hot in run mode, is that a seperate wire from the PCM? I've got the wiring tied in on my project with the stock PCM and SHO ccrm, and the engine turns over but no spark. I checked, and it looks like no power at all to the ignition circuit. I found a red/ green stripe wire that comes off the connector for the dis that mounts to the intake manifold, do I need to run another power wire to that to energize the ignition circuit, do you think?
Thanks again for this particular thread, as well as all other free info you've provided so far!

Bob,

Not quite sure what you are asking. When I say hot in "Run" or "Start", I mean that the ignition switch causes that. Ignition switches have input(s) and outputs. Usually 12 volts is fed into the switch and then output on the "start" "run" or Accessory pins. So when I say the red w/green stripe wire needs to be hot in "run", you will need to connect all red w/green stripe wires to the run position of your ignition switch.

Luckily, the stock wiring harness bridges all the red w/green stripe wires together (that wire might feed multiple sensors or devices) so that the ignition switch only has to deal with one wire.

Tom