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

beyondEOD · Mar 26, 2020

Alright here is is. I now have an EFI Source 86-93 MS3 Gold Box with the Microsquirt to run the AODE.

Build Details:
1995 Mustang
AODE
GT40p Heads
Anderson B-31 Cam 218/228 109ICL 112LSA
Explorer Intake
65mm TB, SN95 MAF, Stock Airbox, K&N Filter
BBK Shorties
VRS Catted X
Ford BB302 30lb Injectors
Carter 255lph Fuel Pump

Electronics:
EFI Source 86-93 MS3 Gold Box
EFI Source Gold Box I/O Expander (Microsquirt with custom connector to fit in the gold box)
14point7 Spartan2 Wideband

Goals:
1. Get the wiring squared away.
2. Get the car started and tuned via Speed Density
3. Work in MAF Correction.
4. Nitrous

Steve, @a91what has been a great help thus far getting my many questions answered. I look forward to working with him to make this car a success.

Keith over at 64bit has successfully completed this setup on his 1994 Cobra. I hope I can follow in his steps and get this thing working. Major props to him for putting out the information on how to get the AODE/4R70w working with the Microsquirt. https://www.facebook.com/64bittuning/ . Keith has pictures of this setup on his Facebook Page and has developed a harness to make this happen.

Microsquirt AODE/4R70w configuration by 64bit: http://www.msextra.com/forums/viewtopic.php?f=138&t=70238

beyondEOD · Mar 26, 2020

Reference Materials for the 94/95

94-95 EEC Pinout Courtesy of Tom Moss

94-95 Alternator & Starting System Courtesy of Tom Moss

TFI Module Pinouts Courtesy of Tom Moss

94-95 Fuel System and Alternator Diagram Courtesy of Tom Moss

beyondEOD · Mar 28, 2020

MS3 Gold with the Microsquirt installed in the case.

beyondEOD · Apr 2, 2020

In order to wire in the new GM style MAP sensor I wanted to try and use the existing EGR Valve wiring and plug. I exhausted my search for the correct male plug to interface with the female EGR electrical connector on the factory harness. I think I found a solution that will work.

I'm going to use the plug from a Standard SG24 Oxygen Sensor. I plan to cut the sensor off and splice it to my MAP harness.

beyondEOD · Apr 7, 2020

Okay I need some help with the wiring:

Here is where I'm currently at with my wiring plan. Please let me know if you see any issues and I also have some questions:

1. How to control the A/C? How should it be wired.

2. For the High and Low fan control do I have that wired correctly?

3. Bond all grounds together, Separate power grounds from sensor grounds, Run a new ground from the engine or battery?

4. Transmission wiring, I'm missing some of the harness connection locations. Anyone know the pin locations or do I need to run a supplemental harness?

EMS Function	94-95 EEC PIN	MS3 Gray	MS3 Black	MicroSquirt	Other
Injector 1	58	-	10	-
Injector 2	59	-	8	-
Injector 3	39	-	6	-
Injector 4	35	-	35	-
Injector 5	15	-	23	-
Injector 6	12	-	11	-
Injector 7	13	-	7	-
Injector 8	14	-	34	-
Wideband 1	-	31	-	-	14point7 Spartan2
ACT	25	34	-	-
ECT	7	33	-	-
TFI PIP	56	20	-	-
TFI Spout	36	26	-	-
TPS	47	32	-	-
TPS VREF	26	30	-	-
SIG RTN	46	18	-	-
Fuel Pump	22	27	-	-
Switched 12v	37	24	-	1
E Fan Low	55	-	32	-
E Fan High	32	-	33	-
Ground	20, 40, 60	17,19	14-20	19, 22-23	To Battery
WOT A/C Cut	54	-	27		Swap Relay Pin 87a to 87
A/C CS	10	8	-	-	Flex Input
IAC	21	-	29	-
MAP VREF	26	30	-	-	Using EGR V Wire
MAP SIG	27	35	-	-	Using EGR V Wire
MAP GND	-	18	-	-	Using EGR V Wire
MAF VREF	26	30	-	-
MAF SIG	50	29	-	-
MAF RTN	9	25	-	-
MAF GND	-	18	-	-
CAN H	-	13	-	2
CAN L	-	14	-	3
Fuel Pressure	-	7	-	-
Sensor Grounds	-	18	-	18, 20	To Battery
TCM Function	94-95 EEC PIN	MS3 Gray	MS3 Black	MicroSquirt	Other
Shift Solenoid 1	51	-	-	8
TCC Lock Up	53	-	-	9
Trans Temp	49	-	-	26
Shift Solenoid 2	52	-	-	7
Trans Sig RTN	?????	-	-	20
EPC	38	-	-	10
Shifter Position 6	?????	-	-	20
Shifter Position 7	?????	-	-	29	Pin 28 to 29 w/470ohm 1/4w 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

MS Pin Outs
	MS3 Gold	MS3 Gold	MicroSquirt
	Gray	Black
PIN
1	IAC2B	Spark Output G	+12V In
2	IAC2A	Spark Output D	CANH
3	IAC1A	Spark Output C	CANL
4	IAC1B	Inj Output J	VR2+
5	Knock	Spark Output A	SPAREADC2
6	PT5+	Inj Output B	FLEX
7	PT4+	Inj Output C	FIDLE
8	Flex	Inj Output D	FP
9	Launch	Inj Output I	INJ 1
10	Nitrous	Inj Output A	INJ 2
11	Table	Inj Output E	SPK B
12	Data	Alt Field	SPK A
13	CAN H	Spark Output H	RX
14	CAN L	Ground	TX
15	PT5-	Ground	BOOT LOAD
16	PT4-	Ground	ALED
17	Ground	Ground	WLED
18	Sensor	Ground	Sensor Ground
19	Ground	Ground	Serial Ground
20	Crank	Ground	Sensor Ground
21	Crank	Alt FB	VR2-
22	Cam	Boost Valve	POWER GROUND
23	Cam	Inj Output F	POWER GROUND
24	12V	Spark Output F	MAP
25	Knock	Spark Output E	CLT
26	Tach	Spark Output B	MAT
27	Fuel	Spark Output I	TPS
28	O2 Bank 2	Spark Output J	TPS VREF
29	Spare ADC	F-Idle	SPAREADC
30	TPS	Nitrous Out	OPTO+
31	O2	Nitrous Out 2	OPTO-
32	TPS-SIG	VVT	VR1+
33	CLT	Fan	VR1-
34	IAT	Inj Output H	O2
35	MAP	Inj Output G	TACHO

From Keith at 64 Bit Tuning

Blown88GT · Apr 8, 2020

1. Here's your A/C control.

AC Issues (No power to compressor)

Hello Fellow Corralers, I have the Megasquirt PNP Gen2 for my 93 Mustang The issue I'm running into is the air conditioning system. I am not getting power to my compressor unit. I've reviewed schematics/wiring diagrams and I've been able to trace it down to A/C Wide Open Throttle unit (btw...

forums.corral.net

2. Can't tell you about the e-fan. I use a separate PWM controller (DCC).

3. Location doesn't matter. Ford used the chassis at numerous locations. All have a green screw.

4. I have a T5 manual transmission.

a91what · Apr 8, 2020

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.

beyondEOD · Apr 8, 2020

Okay I changed the spreadsheet to reflect the following:

-AC Cut will be on Spark Output I, swap relay pin 87a to 87. (Where is this relay located? I noticed a relay setup on the fan motor that is sealed, is this it?)
-ACCS will be on FLEX pin 8.
-Will run a new ground straight to the battery.

a91what · Apr 8, 2020

beyondEOD said:
Okay I changed the spreadsheet to reflect the following:

-AC Cut will be on Spark Output I, swap relay pin 87a to 87. (Where is this relay located? I noticed a relay setup on the fan motor that is sealed, is this it?)
-ACCS will be on FLEX pin 8.
-Will run a new ground straight to the battery.

I will have to confirm but is the flex capable of a 12v+ input signal?
I am not sure where that relay is on your car, on the 87-93 it is on the passenger side under the MAF

beyondEOD · Apr 8, 2020

I'm checking with EFISource on the FLEX input as well

beyondEOD · Apr 8, 2020

The Fans in the 94/95 cars are controlled by the CCRM box. I am trying to figure out how the Microsquirt SN95 kits are controlling the fans and then replicate that.

beyondEOD · Apr 8, 2020

@a91what @Blown88GT

Found this over on DIYAutotune. It is talking about MS2 but would this work for the MS3 and could you advise what the wiring would look like for this?

"If you have an MS2, you can use the two stepper IAC outputs to drive the relays – just wire the two IAC1 wires across the coil of the low speed fan relay, and the IAC2 wires across the coil of the high speed fan relay. The ECU did not control the fans on ’93 and earlier models."

Blown88GT · Apr 8, 2020

beyondEOD said:
@a91what @Blown88GT
....The ECU did not control the fans on ’93 and earlier models."

That's because the fans on ’93 and earlier models are not e-fans.

a91what · Apr 8, 2020

Looks like high and low speed will turn on with a ground trigger from the ecu. all your digital outputs will do this

low speed to pin55
high speed on pin32

The rest will be done in the software, again any of the ign or injector outputs are capable of this along with many others. If needed I can give you exact pins to use on the ecu.

beyondEOD · Apr 8, 2020

I currently have it on the black plug VVT and Fan. Will that work?

beyondEOD · Apr 10, 2020

FLEX cannot handle 12v in. How about Launch in?

a91what · Apr 10, 2020

Nope..... like I said only 12v input is nitrous in. Now you could use a relay and have the 12v on pin 10 trigger it. Then use pins 30 and 87 to pull flex or launch to ground.

beyondEOD · Apr 12, 2020

a91what said:
Nope..... like I said only 12v input is nitrous in. Now you could use a relay and have the 12v on pin 10 trigger it. Then use pins 30 and 87 to pull flex or launch to ground.

Alright let me try here.

Relay 86 to EEC ACCS 10
Relay 30 to ground
Relay 85 to ground
Relay 87 to MS3 Flex In

Do I need a diode in here to isolate?

a91what · Apr 12, 2020

you do not, however a diode is never a bad idea.

1N4001 will do fine for isolation.

You should also be placing a freewheeling diode on any inductive loads, like across the idle valve.

beyondEOD · Apr 12, 2020

I only have 1n4007 diodes

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

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