H22 ECU Problem... My buddy and I finished doing a shell swap from a rusted eg to a better one and we cant remember which wire is the ground wire for the fuel pump because the ECU isn't telling the fuel pump to turn on and I need my car before work on thursday. Its an OBD1 93 Eg coupe. The fuel pump works because we can mainly turn it on. The thermostat is grounded and we changed out the main relay and checked all the fuses. We also added another ground wire to the trans because we thought maybe that was it. We know its not a bad ECU because we trued another ECU and it wont turn om either. Could anyone help please.

 

The fuel pump trigger wire from ecu to main relay is at a7 green/yellow wire.

Do you have 12 volts to the ecu a25 and b1 yellow/black wires?

 

Did you ever resolve this????? Having same issue, same set up

 

Yeah it was the fuse box

 

I guess I'll try that next...sometimes there is a 30 second delay with the key on before the pump kicks on and CEL goes off. Then sometimes it's like a 15 minute delay before it finally kicks on and primes .