Pantera EFI problems - Page 2 - Snowmobile Forum: Your #1 Snowmobile Forum

jKsled · 12-05-2011, 12:24 PM

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.

**RJ Gleason** · 12-05-2011, 12:26 PM

Just a relay.
Only one on that sled.

jKsled · 12-05-2011, 12:34 PM

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

jKsled · 12-05-2011, 12:36 PM

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?

**RJ Gleason** · 12-05-2011, 12:41 PM

That part (#4) is just what it says, the drop resistor for that injector (left or right) since there are 2 of them.

93Wildcat700 · 12-05-2011, 02:06 PM

if you look under "electrical" it shows that box you are thinking of with 3 wires. Thats a Charge Indictor Unit. #8 on here

93Wildcat700 · 12-05-2011, 02:09 PM

And this onyl shows 1 Relay in the entire system #5. and 1 dropping resister?

93Wildcat700 · 12-05-2011, 02:10 PM

So it has to be #5. that is the fuel pump relay.

jKsled · 12-05-2011, 02:48 PM

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...

93Wildcat700 · 12-05-2011, 02:56 PM

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?

93Wildcat700 · 12-05-2011, 03:15 PM

I have the Diagram. Its too big to upload. PM me your email address ill email it to you.

jKsled · 12-05-2011, 05:38 PM

pm sent.

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

jKsled · 12-10-2011, 05:14 PM

Ok. this is still not going well. Does anybody have the complete wiring diagram for this machine, including the ECU pins and everything?

**kccats** · 12-11-2011, 08:42 AM

So you still don't have the pump comeing on at all? You have removed the pump and tested it by itself?

jKsled · 12-11-2011, 09:21 AM

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

93Wildcat700 · 12-11-2011, 12:34 PM

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

93Wildcat700 · 12-11-2011, 12:38 PM

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.

**kccats** · 12-11-2011, 05:29 PM

Try unscrewing the grounds, cleaning them and retighten them!

partybus · 11-13-2012, 05:49 PM

I read your messages did you ever get it running ? What was the problem ?

partybus · 11-13-2012, 06:04 PM

TPS circuit what is it ? TPS