Question for Q45tech about FPCM switch

[ahardb0dy]

I bought a on/off/on switch today and tried to wire it so position 1 was normal, and position 2 was with the lower left wire to ground. When I have the switch on position 1 everything is ok, when I switch it to position 2 I get nothing.

Could you tell me where to hook each wire on the switch please?

I Cut the wire going to the lower left pin, one side I ran to terminal 1 on the switch ( left), the other side I ran to the middle terminal, and the right terminal I ran to a ground, I guess this is wrong? Thanks

[maxnix]

There is a previous post (probably archived) where he discussed the type of switch and how it whould be wired as a theft deterrent device.

[ahardb0dy]

I read that post but I didn't understand what he said, that's why I started a new topic, thanks

[Q451990]

Please post a picture of the switch you bought - or if possible a diagram...

Heath

[Raxephon]

From what I understand of the previous posts, it should look like the following.
Modified by anlasak at 3:49 AM 2/22/2006

[Q45tech]

A toggle switch can have different internal positions.

Normally one would specify SPDT with center off [Noconnection].

THE KEY is to add the CENTER OFF provision

[ahardb0dy]

the switch I bought looks just like the one you posted the picture of. It has 3 terminals, and said on the package and the switch bezel on/off/on.

So how do I wire the switch?

[Q451990]

Does your switch have three pins or four on the bottom?

Heath

[Q45tech]

If in fact the switch is correct type: the center [middle] goes to pump ground terminal, an end terminal to ground and the other one to FPCU.

[ahardb0dy]

ok, So I cut the wire going to the lower left pin, which side are you calling "pump ground terminal" ?

is this correct: one end of switch ( say left end terminal) to the wire coming from the harness , middle terminal to the wire coming out of the plug on the FPCM, and the other end terminal ( right end) to a ground?

Thanks

[ahardb0dy]

can I get some clarification on this please?

[Q45tech]

Many votech schools offer electronic basic courses in schematic reading.......spoon feeding is not my fortay...........must leave something to stimulate mental processes.

Since the pump motor only has 2 terminals and 1 goes to relay then +12, the other terminal must be something else. [-12 or common ground] Important for every human to learn basic skills like electronics, computer construction, and medical- mortuary science.

After all, WHEN next major epidemic occurs [to cull the human overgrowth plaguing the planet] who will restore civilizations toys when Billions die. Before Star Gate there was McGiver [same actor].

[ahardb0dy]

I really love this site, it seems most people on here have some kind of an attitude. You ask a question about something that other people know about and you get a smart a-- answer, or get told to do a search, I bet some people never do searches but I try to. Anyway, I can read a schematic and I read what you said in your last reply I just didn't understand what you meant, the problem is you can ask 10 people what one part or component is called and get 8 different answers, so when you said "pump ground terminal" I wasn't sure which terminal you meant.

As far as the pump motor having only 2 terminals, when I unpluged the harness going to the fuel pump in this car there was like 6 or 8 wires.

I'm sorry if I'm bothering the more experienced members with trival questions and it must kill some of you people to have to answer questions like this, but I can go to the sentra forum I frequent daily and ask any question and get a straight answer with no BS or snotty replies. I don't know does the cost of the car correspond with the hassle in getting a straight answer to a question?

If it takes too much to answer a question than why bother even being here?

[maxnix]

Do you have the schematics? It shoudl be obvious from that. If not, confirm with a DVM. it is hard to determine L from R wire on the internet when it is all text.

Give it a try. You can do it.

[Q451990]

ok, So I cut the wire going to the lower left pin, which side are you calling "pump ground terminal" ?

is this correct: one end of switch ( say left end terminal) to the wire coming from the harness , middle terminal to the wire coming out of the plug on the FPCM, and the other end terminal ( right end) to a ground?

Thanks

I think that's pretty much what you want to do, but the center pin should feed the fuel pump.

OK... here's my guess, not actually having a switch in front of me. You need to verify this with a multi-meter. You can check to see what the pins are doing by doing a continuity check (the setting that makes the meter beep when you touch the leads together).

Connect terminal 2 to the wire that goes back to the (-) terminal on the fuel pump.

Connect Terminal 3 to the wire going into the FPCU.

So when the switch is up (or as it's shown in the picture flipped to the left) the pump runs as normal.

[Q451990]

Now - to bypass the controller.

Terminal 2 is already feeding the negative terminal on the fuel pump...

Connect Terminal 1 to ground... any metal point on the body of the car... not protected by paint.

Then when the switch is down (or in this picture to the right) the pump is grounded directly rather than through the FPCU. It will run in "high" mode and should get you home if the FPCU is fried.

[Q451990]

When the switch is in the center position (straight up as pictured) then none of the terminals are connected to each other. This is the kill switch position that Dennis mentions. The negative terminal on the pump is not being fed by either the FPCU or chassis ground - so it won't work at all.

Good luck!

Heath

[Q45tech]

Your confusion seems to be from working from the easier to get to FPCU connector/ unit vs the top of the fuel pump assembly.

Per schematic you see that the FPCU connector has extra connections [like trimode signal wire from ECU, +12 volts for FPCU, etc.

[ahardb0dy]

Thanks for everyones help, I got the switch working today, turns out I just had to switch 2 of the wires around. thanks again.

[Q451990]

Good news!

Heath