found a very helpful thread on this subject. things are looking toward pin 63 not supplying ground to activate the side of the relay that turns on the ecu. I guess its a very common problem when the caps start to leak in the ecu...
Sorry i ghosted for a bit. Got sidetracked working on other stuff for a bit and had to take a break on the dsm. I replaced the diode on the ecm power side of the mpi relay, bench tested fine, put into the car and..... nothing. hopefully i can find a little extra time this week to finally...
Terminal 10 on the mpi relay has nothing to do with the fuel pump, only ECM powerup. you are going to be looking for power on terminal 3 with your ignition on. completely separate relays, just under the same roof.my fuel pump does not engage until the motor starts to crank.
The pump should only kick on when the engine starts cranking. I had what I thought was a similar problem as well. Installed a new pump, had it switching on and then lost it .Took the pump back out and reallize I didn't tuck the wires in the tank well enough and the sender pinched the wire. The...
Sounds like you have the same problem i do. Something probably spiked voltage and took out the diode. When pins 10(+) and 8(-) are energized they run power to the ecm via pins 4(+) and 5(+) to actually get it to turn on and route power to the necessary sensors. the relay is repairable, but you...
Resurrecting a 92 1G that has been a relic of the yard for the past decade. Previous owner almost killed me when i figured out the fuel pump was shorting out in the tank with a hot wire with no inline fuse coming off the fuse panel to the pump to ramp up pump voltage. tank was shot, pump was...