94-95 Mustang 5.0 AODE MS3 Gold Box w/ Microsquirt

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beyondEOD

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Next question on the 86-93 Harness EFISource has the following configuration:
Pin 57(Ing 12V) jumped by a 330ohm resistor Pin 36(Spout)
Pin 36 wired to MS3 Gray 26(Tach)

When comparing the 93 EEC vs the 94 EEC pins 57 and 36 have the same purpose on the harness.

@a91what What is the purpose of the resistor as compared to just jumping with a wire? (Is this lowering the circuit voltage into the MS3 to 5v?
 
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beyondEOD

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that should be ok it just has a higher voltage handling. I would check the spec sheets and make sure it meets or exceeds the 1n4001
1N4001 50V 1A
1N4007 1000V 1A

Looks like it will work. I've read that the 1N4001 would be more efficient but I'm not sure that really matters for what I'm accomplishing here.
 

beyondEOD

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It would appear that the MS3 Gold has the diodes built in to the board if my interpretation of this diagram is correct.

1586723164060.png
 

a91what

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That would appear to be so, it does not appear to be the mosfet body diode as it is not the same. they may be using a darlington array [most likely] those have the diode built into them.
 
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beyondEOD

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AC cycle switch on pin 10 is a 12v+ input signal. I used the nitrous input for this. The wot relay needs a ground trigger, an unused inj output will do just fine. You will want to find the relay and swap pin 87a to 87. This way the MS3 can turn the compressor on instead of off, this is how i did mine.

I like to take the grounds to a common wire that travels back to the battery for the lowest ground offset value.
Found an issue here this relay is part of the 94-95 CCRM and is located on a PCB. How can I make this work?
 

a91what

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Found an issue here this relay is part of the 94-95 CCRM and is located on a PCB. How can I make this work?
Ah ok, have you posted this diagram already? I can take a look at it. If needed I can help you do this with loop function so it's a moot point. Just continue on
 

beyondEOD

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Sounds good. Still installing a relay in-between the MS3 and the ACCS Relay in the CCRM as well?

EECGray MS3Black MS3
WOT A/C Cut​
54​
-​
27​
-​
A/C CS​
10​
8​
-​
-​
Pin/Relay: EEC-10/86, Gnd/30, Gnd/85, MS3-G8/87​
 

beyondEOD

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To power the wideband only when the FP is on. How does this look? Wanting to setup a relay in parallel and protect the MS3 best as I can.

WidebandRelay.PNG
 

beyondEOD

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Okay I'm about to order the parts I'm missing to do these two relays.

Can someone basically triple check I have this diagram setup correctly to run the wideband only when the FP relay is triggered, then the ACCS relay triggers gorund to Flex In when 12v comes in on the stock harness pin 10 from the ccrm.
Wideband_ACCS_Relays.PNG
 

Blown88GT

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You don't need the diodes across the small relays because their coils are so small.
Instead of the fuel pump relay, you can use the EEC Power Relay, then you would only need one additional relay which can be a simple automotive 30 or 40 amp relay available everywhere, no need to order it.
2018-03-10_080526.jpg
 

beyondEOD

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So you suggest that I use the power out from the EEC relay(MS3 power source) to also power the o2 sensor? In essence eliminating the relay on the left of my diagram?

I still need the relay on the right for A/C Control.
 

a91what

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No, the wideband should not be powered when the engine is not running. Unless you want to shorten the life of the sensor.
Do NOT wire it to come on with the ECU, if you need to have it wired to key power for testing install an empty fuse socket that can be used to jumper power to it.

Otherwise the diagram looks fine.
 
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Blown88GT

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I added a toggle switch from 85 to ground.
I keep forgetting this is a Microsquirt on a '95. You need both relays. You don't need the diodes. My MS has a 2N2222 driving the relay coil of the WOT relay. A 2N2222 will sink 1A, relay coil draws 1/3A.
 
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