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Discussion Starter · #1 · (Edited)
I spend lots of Time and Hours looking for information of this pinout for 1st gen A, so here it is, hopefully this help someone else guide them putting megasquirt in their 1st gen.
This particular ecu is for a member here , that was sent to me .
its a microsquirt ecu.
The ideal is to use stock harness and create a plug and play unit for the car and can be interchangeable from megasuirt to factory ecu for emission purposed .

1st you will need a dummy ecu to removed the ecu connector or just buy one from diy autotune.
Hand tool Wood Pliers Kitchen utensil Brush


now you need to label the ecu connectors base off workshop manual
Hood Automotive lighting Automotive parking light Motor vehicle Font


Here is the ecu pin out for the 88-89GT
Handwriting Font Material property Writing Paper


finished product will look like this -well yours will probably looks 10x better
Wood Electrical wiring Gadget Cable Camera accessory


ECU PIN / MICROSQUIRT HARNESS

1N- VR2 + DISTRIBUTOR G1 SIGNAL +
1P- VR2 - DISTRIBUTOR G1 SIGNAL -
1Q- VR1 - DISTRIBUTOR NE -
1T- VR1 + DISTRIBUTOR NE +
1X- IGNITER SIGNAL
2A- VOLTAGE REF-5V
2C- GROUND SENSOR (E2) TIED TO 2R(E2)
2D- O2 SENSOR INPUT
2G- TPS SENSOR
2I-COOLANT TEMP SENSOR
2J-INTAKE TEMP SENSOR
2O- FUEL PUMP RELAY
2Q-IDLE SPEED CONTROL
2R-GROUNF(E2)
3A-GROUND (E1) SERVICE
3C- INJECTOR 2 & 4
3E- INJECTOR 1 & 3
3G- GROUND (E1) SERVICE
3I- POWER (MAIN) RELAY

final product
Wood Bicycle handlebar Wood stain Hardwood Bicycle part
 
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