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

beyondEOD · Apr 15, 2020

Ok next battle is finishing up the transmission setup:

1. I need help determining Where the Trans Signal Return is on the EEC Plug. I have looked over tons of diagrams and cannot find any ground information for the AODE Harness and ultimately where they end up when they make it to the EEC Harness.

2. Same thing as above where does the MLPS gnd come into the EEC?

3. For the VSS+ and VSS-, Keith from 64 Bit Tuning has it listed to install a 20-40ohm shunt resistor to reduce noise. I am not familiar with what i need here exactly. If you know what I need please help. Could I use a 10uF capacitor to reduce noise instead?
4. OD Switch setup. It is listed to wire it to ground. Im thinking this wire comes in on the eec plug on pin 41. If that is the case do I connect EEC pin 41 to Micro 34. Then at the switch take the other wire and ground to the chassis near the radio.

TCM Function	94-95 EEC PIN	MS3 Gray	MS3 Black	MicroSquirt	Other
Shift Solenoid 1	51	-	-	8
TCC Lock Up	53	-	-	9
Trans Temp TOT	49	-	-	26
Shift Solenoid 2	52	-	-	7
Trans Sig RTN (Sen GND)	????	-	-	20
EPC	38	-	-	10
MLPS Sensor GND	????	-	-	20
MLPS	30	-	-	29
MLPS VREF				28	Jump Micro 28 to 29 with 470ohm resistor
VSS+	3	-	-	32	22-40ohm 1/4w shunt resistor
VSS-	6	-	-	33	22-40ohm 1/4w shunt resistor
OD Switch	-	-	-	34	Wire switch to ground

64Bit Tuning Guide:

beyondEOD · Apr 16, 2020

Okay decipha at efidynotuning.com confirmed the all signal returns come I to pin 46 on the EEC.

So that answers questions 1 & 2.

Now questions 3 & 4.

a91what · Apr 16, 2020

For #3 I use a 1k resistor, the purpose is to shunt some of the spike. remember that a VR sensor produces an AC wave form and at high speeds this can become too much for the input to handle. The micro has a capacitor shunted internally.

#4 the signal is a ground input, you can either use the sgn rtn or chassis ground. both will work

beyondEOD · Apr 16, 2020

Thanks.

Just to clarify further for the OD switch I will take EEC 36 and jump it to a ground. Then the factory switch will work as designed?

a91what · Apr 16, 2020

beyondEOD said:
Thanks.

Just to clarify further for the OD switch I will take EEC 36 and jump it to a ground. Then the factory switch will work as designed?

That is correct, this is also how i have mine wired.
other things to think about with the micro is tying in the brake light switch to drop you out of lock up and overdrive, this does require a 12v input to be made a ground signal. if you are willing to build a small board with components i can give you plans to do this with a transistor rather than a relay.
Alternatively you can solder the components and tape them then seal it in heat shrink inside the harness.

beyondEOD · Apr 16, 2020

Absolutely I'll PM my email address.

beyondEOD · Apr 17, 2020

Using the transistor setup would this be better than a relay for the ACCS Circuit I posted?

a91what · Apr 17, 2020

Its smaller and wont go bad over time.. no clicking noises.. it's my go too personally. I always suggest a relay because most people understand how they work.

beyondEOD · Apr 17, 2020

I like this better with the transistor.

Blown88GT · Apr 17, 2020

beyondEOD said:
I like this better with the transistor.

Google: "use a transistor as a switch"
BTW, this is how all CPU's work, millions of transistors acting as switches, i.e. ON=1, OFF=0.
Early computers did use relays, then vacuum tubes, then transistors, then integrated circuits.

beyondEOD · Apr 25, 2020

I am finishing up the harness and am wondering why EFI Source has a 330ohm resistor from EEC Pin 57 to EEC Pin 36:

EEC Description	EEC Pin	MS3 Description	MS3 Pin
12V Ignition	57
SPOUT	36	Tach	26

a91what · Apr 25, 2020

Likely using it as a pullup resistor for the signal.

beyondEOD · Apr 25, 2020

Ok good to leave it in there then?

I was going to us 57 to power the micro but ill tap into the other 12v ign source.

beyondEOD · Apr 26, 2020

Got to call it quits tonight/this AM. Here is where I'm at. Getting there....

beyondEOD · Apr 27, 2020

All cleaned up.

a91what · Apr 27, 2020

Looks really good, I am not sure if you posted what kind of connectors you used in the harness? [the 2 pin ones]

beyondEOD · Apr 27, 2020

They are Molex Mini Fit jr connectors

beyondEOD · Apr 29, 2020

MAP sensor adapter to use existing EGR Valve wiring complete. That ebay likely counterfeit O2 sensor plug worked out.

beyondEOD · May 6, 2020

Alright got the MS3 in the car and powered up. No smoke as of now. Did have a small wiring error with the CAN wiring. Switched the wires and the Micro connected. Lost my desoldering tool so I still have not connected the mosfets to take a few of the inputs to ground when triggered. So soon as Amazon delivers I can finish that wiring.

The ToDo List that I need help with:

H/L Fan Control
FP Sensor (on PT4, could not figure out how to assign PT4 to a generic sensor; should I repin to the spare 02 input?)
VSS Configuration
MLPS Configuration
IAT Calibration (assume the generic Ford Cal will work next time i connect to the MS)
CLT Callibration (assume the generic Ford Cal will work next time i connect to the MS)
ACCS Configuration
OD Switch

I have been through the software and have found these holes in my configuration. Might be time for some remote support.

beyondEOD · May 10, 2020

Came up with this mosfet board I found on ebay to handle my ground triggers. I removed the screw terminals that came on the board and soldered wires direct. I'm using this for the following functions.

Wideband turn on (complete the PWR GND of that circuit)

TC unlock with Brake engagement

ACCS

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

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