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post #21 of 45 (permalink) Old 12-05-2011, 12:24 PM Thread Starter
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Thats what im planning on doin, man these efi systems can be a real pita sometimes when you are getting familiar with them! I dont think the actual relay would be in the ecu, the ecu would switch the trigger voltage on/off for the relay. And then the relay would switch the pump power voltage on/off. At least thats what i would assume from past experience...

I did find one "relay" thing that had something to do with fuel pump, however it wasnt the bosch type. Right on the firewall it was a metal rectangle with three wires coming in. One was hot and the other two wwerent. When it was unplugged there was no pwr to fuel pump or injectors. It almost seemed like a big resistor maybe? The microfiche called it... Hold on gotta look it up quick again.

1992 Polaris RXL 650 EFI
1990 Skidoo Formula MX 470
1997 Skidoo Grand Touring 500
1997 Arctic Cat Pantera 580
1979 Ford F150
~360 5.9L, Edelbrock intake, 4bbl carb, 4 speed, divorced transfer case, 3" body lift, 3" suspension lift, 33's, redone interior.
2003 Dodge 3500 srw 6spd

1981 Suzuki GS850L

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post #22 of 45 (permalink) Old 12-05-2011, 12:26 PM
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Just a relay.
Only one on that sled.

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post #23 of 45 (permalink) Old 12-05-2011, 12:34 PM Thread Starter
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One relay for injextor/fuel pump? Or lights/fuel pump? Also, that part i was talking about is called the "resistor ass'y injector. It is #4 in The ecu and ecu harness assemblies of the microfiche

1992 Polaris RXL 650 EFI
1990 Skidoo Formula MX 470
1997 Skidoo Grand Touring 500
1997 Arctic Cat Pantera 580
1979 Ford F150
~360 5.9L, Edelbrock intake, 4bbl carb, 4 speed, divorced transfer case, 3" body lift, 3" suspension lift, 33's, redone interior.
2003 Dodge 3500 srw 6spd

1981 Suzuki GS850L

And, I am a firm believer in the Buffalo Theory!
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post #24 of 45 (permalink) Old 12-05-2011, 12:36 PM Thread Starter
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Looks like we're both typing at the same time lol. Ok well i'll check it out. However last time i tried it with a new relay and there was no change?

1992 Polaris RXL 650 EFI
1990 Skidoo Formula MX 470
1997 Skidoo Grand Touring 500
1997 Arctic Cat Pantera 580
1979 Ford F150
~360 5.9L, Edelbrock intake, 4bbl carb, 4 speed, divorced transfer case, 3" body lift, 3" suspension lift, 33's, redone interior.
2003 Dodge 3500 srw 6spd

1981 Suzuki GS850L

And, I am a firm believer in the Buffalo Theory!
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post #25 of 45 (permalink) Old 12-05-2011, 12:41 PM
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That part (#4) is just what it says, the drop resistor for that injector (left or right) since there are 2 of them.

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w/ Comet 108 Pro-4 clutch & 01 ZR skid

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post #26 of 45 (permalink) Old 12-05-2011, 02:06 PM
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if you look under "electrical" it shows that box you are thinking of with 3 wires. Thats a Charge Indictor Unit. #8 on here
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post #27 of 45 (permalink) Old 12-05-2011, 02:09 PM
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And this onyl shows 1 Relay in the entire system #5. and 1 dropping resister?
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post #28 of 45 (permalink) Old 12-05-2011, 02:10 PM
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So it has to be #5. that is the fuel pump relay.

1993 Wildcat 700 EFI- river runner

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post #29 of 45 (permalink) Old 12-05-2011, 02:48 PM Thread Starter
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Ok. I agree there is only one relay. When I jumped that relay though, the headlights came on. That is why I was confused...

again, heres where i'm at. flashing codes for both injectors, and the fuel pump doesn't come on.

and I was referring to the dropping resistor for the injectors. but that doesn't check out to be bad.

Does the fuel pump ground through ECU? anybody have a wiring diagram for this or know which wires are what from the fuel pump?

There is 4 wires coming out of it. One red, black, and two that are like white/blue or something. those i assumed were for the fuel gage reading. the black turns into two brown wires, neither of those have continuity with ground. If it does ground through the ECU, then if I knew what color to test on the ECU i could see if that wire is bad? idk...

1992 Polaris RXL 650 EFI
1990 Skidoo Formula MX 470
1997 Skidoo Grand Touring 500
1997 Arctic Cat Pantera 580
1979 Ford F150
~360 5.9L, Edelbrock intake, 4bbl carb, 4 speed, divorced transfer case, 3" body lift, 3" suspension lift, 33's, redone interior.
2003 Dodge 3500 srw 6spd

1981 Suzuki GS850L

And, I am a firm believer in the Buffalo Theory!
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post #30 of 45 (permalink) Old 12-05-2011, 02:56 PM
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Ok #3 in the ECU diagram is listed as a lamp Assembly? That cylinder thing?

so can you find that one? and what does that do if you jump it... looking for diagram

4 wires coming out of the Square relay right?

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post #31 of 45 (permalink) Old 12-05-2011, 03:15 PM
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I have the Diagram. Its too big to upload. PM me your email address ill email it to you.

1993 Wildcat 700 EFI- river runner

2000 ZRT chassis/Wildcat 700 EFI motor swap. Stock lol
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post #32 of 45 (permalink) Old 12-05-2011, 05:38 PM Thread Starter
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pm sent.

I'll take a look at whats going on more tonight. The diagram will help alot. thanks man

1992 Polaris RXL 650 EFI
1990 Skidoo Formula MX 470
1997 Skidoo Grand Touring 500
1997 Arctic Cat Pantera 580
1979 Ford F150
~360 5.9L, Edelbrock intake, 4bbl carb, 4 speed, divorced transfer case, 3" body lift, 3" suspension lift, 33's, redone interior.
2003 Dodge 3500 srw 6spd

1981 Suzuki GS850L

And, I am a firm believer in the Buffalo Theory!
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post #33 of 45 (permalink) Old 12-10-2011, 05:14 PM Thread Starter
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Ok. this is still not going well. Does anybody have the complete wiring diagram for this machine, including the ECU pins and everything?

1992 Polaris RXL 650 EFI
1990 Skidoo Formula MX 470
1997 Skidoo Grand Touring 500
1997 Arctic Cat Pantera 580
1979 Ford F150
~360 5.9L, Edelbrock intake, 4bbl carb, 4 speed, divorced transfer case, 3" body lift, 3" suspension lift, 33's, redone interior.
2003 Dodge 3500 srw 6spd

1981 Suzuki GS850L

And, I am a firm believer in the Buffalo Theory!
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post #34 of 45 (permalink) Old 12-11-2011, 08:42 AM
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So you still don't have the pump comeing on at all? You have removed the pump and tested it by itself?
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post #35 of 45 (permalink) Old 12-11-2011, 09:21 AM Thread Starter
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OK, the pump comes on when I test it by itself.

The pump has a constant 12v going to it when ignition is on, I am trying to trace the ground back to the computer now. Because the ECU switches the ground on/off to turn pump on/off.

and computer is still flashing both injector codes.

However, Injectors ohm correctly, dropping resistor ohms correctly.

I still just think it is a bad wire somewhere, just based on the fact that to get it started the first time this year my dad hit it a few times and shook it. Then it worked

1992 Polaris RXL 650 EFI
1990 Skidoo Formula MX 470
1997 Skidoo Grand Touring 500
1997 Arctic Cat Pantera 580
1979 Ford F150
~360 5.9L, Edelbrock intake, 4bbl carb, 4 speed, divorced transfer case, 3" body lift, 3" suspension lift, 33's, redone interior.
2003 Dodge 3500 srw 6spd

1981 Suzuki GS850L

And, I am a firm believer in the Buffalo Theory!
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post #36 of 45 (permalink) Old 12-11-2011, 12:34 PM
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I can say this. You just need to go to town on the wiring harness.

Start tracing the wires back from the Fuel pump. Im sure you will find the go back to the Fuel Relay. Usually on EFI it goes like this.

Trigger wires on recoil 2 of them.. Go back to ECU in the EFI main harness.

Than you need to follow them from the ECU to wherever they are going. Depends on each model i cannot remember off my head. You could figure it out though. Probably go from the ECU to either that drop resistor or that fuel pump relay... if you trace them in reverse from injector harness and fuel tank backwards it will be ALOT easier.

Yeah you need the EFI wiring Diagram.. i would agree it would help


Does the fuel pump ground through ECU?.. YES

1993 Wildcat 700 EFI- river runner

2000 ZRT chassis/Wildcat 700 EFI motor swap. Stock lol
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post #37 of 45 (permalink) Old 12-11-2011, 12:38 PM
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and you said your dad hit it a few times. What did he Hit the ECU? prob just a smashed wire. Thats the only explanation if you jumped the Relay and your lights came on?? could you have jumped the Lighting relay not the fuel relay??

If you jumped the fuel relay.. and the lights came on that would kind of indicate that the lighting and fuel wires run next to each other in the harness. Maybe they rubbed through and lighting current is mixing with EFI signal.. LONG SHOT but just start looking for rubbing. Look at the trigger wiring too by the pickup on the recoil.

1993 Wildcat 700 EFI- river runner

2000 ZRT chassis/Wildcat 700 EFI motor swap. Stock lol
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post #38 of 45 (permalink) Old 12-11-2011, 05:29 PM
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Try unscrewing the grounds, cleaning them and retighten them!
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post #39 of 45 (permalink) Old 11-13-2012, 05:49 PM
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I read your messages did you ever get it running ? What was the problem ?
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post #40 of 45 (permalink) Old 11-13-2012, 06:04 PM
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TPS circuit what is it ? TPS
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