Microsquirt installation / wiring.

jgregg13

Well-known member
Supporter 2021
I'm about to install Microsquirt to run a 1994 4.9 EFI engine that is being turbo charged. Using the M5OD trans, so no automatic to worry about. The engine has been transplanted into a 1948 Chev car. I have all the wiring harnesses from the '94 F150. I want to use the Ford harness from the EEC IV and wire the Microsquirt into the back of the 60 pin EEC IV socket. If any of you have done this already, would you have a handy dandy pin to pin list or diagram I could use? If not I'll have to post mine once I get it running.

Vq5s3U7.jpg
 
Pin 1 = KAPWR (keep alive power) = yellow
Pin 2 = BOO (brake on/off) (E4OD only) = light green
Pin 3 = PSOM + (Programmable Speedo/Odo Module) (square wave vss signal from PSOM) gray/black
Pin 4 = IDM (Ignition Diagnostic Monitor) = yellow/black
Pin 6 = PSOM - (Programmable Speedo/Odo Module) (square wave vss signal from PSOM) pink/orange
Pin 7 = ECT (Engine Coolant Temp) = light green/red
Pin 8 = Fuel Pump Monitor (monitors secondary side of fuel pump relay for feedback) = dark green/yellow
Pin 9 = SCP - (data bus -, may not be equipped on MAP vehicles) = pink/light blue
Pin 10 = A/C clutch = pink/light blue (yes, duplicate color)
Pin 11 = Secondary Air Diverter (all models W/O E4OD) = brown
Pin 12 = 4x4 Low Range input (4x4 only) light blue/black
Pin 16 = Ignition Ground (Hall effect ground in dist) = orange/red
Pin 17 = STO/MIL (Self Test Output) = pink/light green
Pin 19 = SS2 (Shift Solenoid 2) (E4OD only) = purple/orange
pin 20 = Case ground = black
Pin 21 = IAC (Idle Air Control) = white/light blue
Pin 22 = FP (Fuel Pump) (Grounds coil of FP relay) = light blue/orange
Pin 23 = KS (Knock Sensor) = yellow/red
Pin 25 = IAT (Intake Air Temp) = gray
Pin 26 = VREF (5v supply to sensors) = brown/white
Pin 27 = EVP (Egr Valve Position) = brown/light green
Pin 28 = SCP + (data bus +, may not be equipped on MAP vehicles) = tan/orange
Pin 29 = HO2S (Heated Oxygen Sensor) = gray/light blue
Pin 30 = P/N (Park/Neutral switch( (C6 only) = light blue/yellow
Pin 31 = CANP (Canister Purge Solenoid) (all models W/O E4OD) = gray/yellow
Pin 32 = TCIL (Trans OD Cancel Lamp) (in cluster) = white/light green
Pin 33 = EVR (Egr Vacuum Regulator) = brown/pink
Pin 36 = SPOUT (SPark OUTput) = pink
Pin 37 = VPWR (Vehicle Power) = red
Pin 38 = EPC (Electronic Pressure Control) (E4OD only) = white/yellow
Pin 40 = PWR GND (Power Ground) = black/white
Pin 41 = TCS (Tran OD Cancel Switch) (E4OD only) = tan/white
Pin 42 = TFT (Trans Fluid Temp) (E4OD only) = orange/black
Pin 43 = A/C Demand (taps into A/C clutch circuit for idle up) = purple
Pin 45 = MAP (Manifold Absolute Pressure) = light green/black
Pin 46 = SIG RTN (Signal Return( (ground path for sensors) = gray/red
Pin 47 = TPS = (Throttle Position Sensor) = gray/white
Pin 48 =STI (self Test Input) = white/purple
Pin 49 = HO2S GND (Heated Oxygen Sensor Ground)= orange
Pin 51 = Secondary Air Bypass = white/orange
Pin 52 = SS1 (Shift Solenoid 1) (E4OD only) = orange/yellow
Pin 53 = TCC (Torque Converter Clutch) (E4OD only) = pink/yellow
Pin 55 = CCS (Converter Coast Solenoid) (E4OD only) = brown/orange
Pin 56 = PIP (Profile Ignition Pickup) = gray/orange
Pin 57 = VPWR (Vehicle Power) = red
Pin 58 = INJBANK1 (Injector Bank 1) (cyls 1,3,5) = tan
Pin 59 = INJBANK2 (Injector Bank 2) (cyls 2,4,6) = white
Pin 60 = PWR GND (Power Ground) = black/white

This is for a 1994 F150 4.9L 60 pin ECM.

Pins 37 and 57 and 40 and 60 are redundant circuits for additional current handling.

-Your harness colors may be different, Ford is notorious for substituting wire colors. The PIN location in the connector is what is important.
 
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