1997 legacy donor. Got to the point where i was testing the harness. plugged in all sensors and the 3 connectors on the back of the motor. applied 12v to the red power wire and power to the yellow keyed power wire. the main relay clicks but the fuel pump relay does not. someone on facebook said that some systems only operate the pump when the motor is kicking over. the ecu pinout i have for the 1997 shows that it will apply voltage for 4 seconds then nothing if no rotation is detected. just wondering what conditions need to be met for the ecu to send power to the pump.
1997 legacy ej22 motor/harness came from a running car.
fuel pump not kicking on
-
Piledriver
- Moderator
- Posts: 22520
- Joined: Sat Feb 16, 2002 12:01 am
Re: fuel pump not kicking on
It needs so see pulses from the crank sensor or distributor as applicable to stay on.
Bosch CIS injection even came with a fuel pump relay that worked the same way.
It was the only "electronic" part of the original systems aside from a couple heaters operating bimetal spings.
Bosch CIS injection even came with a fuel pump relay that worked the same way.
It was the only "electronic" part of the original systems aside from a couple heaters operating bimetal spings.
Addendum to Newtons first law:
zero vehicles on jackstands, square gets a fresh 090 and 1911, cabby gets a blower.
EZ3.6 Vanagon after that.(mounted, needs everything finished) then Creamsicle.
zero vehicles on jackstands, square gets a fresh 090 and 1911, cabby gets a blower.
EZ3.6 Vanagon after that.(mounted, needs everything finished) then Creamsicle.
-
david58
- Moderator
- Posts: 14096
- Joined: Sun Oct 23, 2005 6:14 pm
Re: fuel pump not kicking on
Needs to see ground too.
-
Hegel
- Posts: 58
- Joined: Thu Sep 13, 2012 10:24 am
Re: fuel pump not kicking on
shoot. I just went through the entire ground pinout on the ecu and they are all hooked up. also tried checking the output while the engine turns over. no dice. I decided to send the harness and ecm out to be verified because i could spend days trying to figure out something that they can find in no time.