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914World.com _ 914World Garage _ I dont hate wiring

Posted by: grasshopper Nov 27 2005, 02:42 PM

well, i figured out all of my wiring porblems that i had been bitching about for the last two weeks or so today. All at one time..... At first, there were no blinkers, no brakes, erractic headlights, no reverse lights, and no power to the relay board... well, today i pulled the connector out of the igition switch, and connected a 74 switch, put the key in, and everything worked.... everything I didn't think that so much was dependent on that...... the only thing that is preventing my engine from running now is the fuel pump. This is a FI 1.8 engine. I'm thinking its the dual relay, but i'm not sure... i made a jumper wire from the big black wire with the red stripe on it, to the positive side of the battery, and the fuel pump fired right up, so thats why i think its the dual relay... Also, if i pry the cap off of the little round relay on the relay board and push the contacts together, it runs the pump... something isn't telling that little relay to click...what is it??? thanks to everyone that has helped

Posted by: Long Prong Nov 27 2005, 02:44 PM

turn your car on...not start just on

and stick your finger in that AFM and push the flap up....

the fuel pump wont run if the flap is completly closed.

Posted by: Aaron Cox Nov 27 2005, 02:46 PM

QUOTE (Long Prong @ Nov 27 2005, 01:44 PM)
turn your car on...not start just on

and stick your finger in that AFM and push the flap up....

the fuel pump wont run if the flap is completly closed.

b

yup

fuel pump runs while cranking.....
unlike priming itself like djet

Posted by: grasshopper Nov 27 2005, 02:47 PM

i had my dad hold the fuel pump, while i was cranking it, and he said it wasn't doing anything

Posted by: Headrage Nov 27 2005, 02:48 PM

Isn't there a fuse back on the relay board that feeds the relay?

Maybe?

Posted by: grasshopper Nov 27 2005, 02:51 PM

there are two fuses back there, but i dont know if they controll anything

Posted by: Long Prong Nov 27 2005, 02:53 PM

hold the AFM flap up, not the fuel pump....

the 1.8 ECU tells the fuel pump to turn on only when air is coming into the engine, i guess to try to prevent running rich at crankover and to prevent a backfire...also would work good in a wreck too i would imagine.

Posted by: Mueller Nov 27 2005, 02:57 PM

are you getting power to the injectors?

when the AFM opens, the dual relay (near the battery) powers up and provides power to the fuel pump and the injectors.....

the injectors fire when the coil collapses and the ECU grounds one side of the injectors....

Posted by: ejm Nov 27 2005, 03:51 PM

QUOTE (grasshopper @ Nov 27 2005, 04:42 PM)
... Also, if i pry the cap off of the little round relay on the relay board and push the contacts together, it runs the pump... something isn't telling that little relay to click...what is it???

With L-jet the dual relay runs the pump, not one of the relays on the board.

There is a wire from the dual relay that goes to the relay board at T12/12 to power up the fuel pump. The relay on the board won't run the pump because its looking for a signal from a D-jet ecu.

Check out the http://www.pelicanparts.com/914/parts/Electrical/914_electric_74_AFC-B.jpg

Posted by: bmunday Nov 27 2005, 03:52 PM

Keep going man... When your done you can come over and help me out. You da man!!!

Posted by: grasshopper Nov 27 2005, 04:49 PM

QUOTE (Mueller @ Nov 27 2005, 12:57 PM)
are you getting power to the injectors?

just checked, and no ..... what now??

Posted by: scotty b Nov 27 2005, 05:01 PM

Congrats and thanks for the info. I had no idea the switches were wired so radically different. something to put in the mental file. I think

Posted by: grasshopper Nov 27 2005, 05:27 PM

anyone?? ok, i get power to the points, and i can get the dual relay to click..... is it supposed to click when i turn the switch on??? now im thinking it has something to do with the AFM.... i can tell where the power ends.... help