ECU fuel pump issue

[fossilrider!]

Hi guys/gals, Steve here in Tn.. I'll try to make this as short/painless as I can. I have a '07 FJR1300 manual trans that developed an issue over a year-and-a-half ago. The reason I am just now getting back on the problem is that I had bypass surgery about the time this issue started, so I've been sidelined since then. The issue is that the fuel pump stopped getting power. So, I pulled the tank and seat, and some of the fairing off and started to search. Fuses are all good, all connections that I have checked are good and clean (bike has always been kept inside). Fuel pump relay is good, but I put a new one in anyway. Checked all the ground "spiders" that I could find. I did all this when the issue started and the bike has been sitting since then. So.... I decided a few weeks ago to just bite the bullet and take it to the dealer, where I have known the owners for decades. When they finally got around to checking it out, the tech called and asked me where the ECU was.? I assumed it was on the bike and don't remember removing it. But after it being 1 1/2 years since I worked on it, who knows? Anyway, after looking all over my shop I remembered that a previous owner had installed a "Power Commander", which I had removed during all the digging I had done. Now, since this is the first time I have ever even seen a Power Commander, I started to wonder how they work. Does a Power Commander actually take the place of the OEM ECU or is it simply an add-on? The little I know about these units is that they just allow access into the system so the settings can be tweaked for more power/better fueling, etc.. In that case, the original ECU would stay in place instead of being replaced by the Power Commander.? If this unit replaces the ECU, I can stop looking for the ECU and just take the Power Commander to the shop. Anyway, I'm sure the folk here can lead me in the right direction. Thanks for any info.

 

[Dan Cooper]

Hi guys/gals, Steve here in Tn.. I'll try to make this as short/painless as I can. I have a '07 FJR1300 manual trans that developed an issue over a year-and-a-half ago. The reason I am just now getting back on the problem is that I had bypass surgery about the time this issue started, so I've been sidelined since then. The issue is that the fuel pump stopped getting power. So, I pulled the tank and seat, and some of the fairing off and started to search. Fuses are all good, all connections that I have checked are good and clean (bike has always been kept inside). Fuel pump relay is good, but I put a new one in anyway. Checked all the ground "spiders" that I could find. I did all this when the issue started and the bike has been sitting since then. So.... I decided a few weeks ago to just bite the bullet and take it to the dealer, where I have known the owners for decades. When they finally got around to checking it out, the tech called and asked me where the ECU was.? I assumed it was on the bike and don't remember removing it. But after it being 1 1/2 years since I worked on it, who knows? Anyway, after looking all over my shop I remembered that a previous owner had installed a "Power Commander", which I had removed during all the digging I had done. Now, since this is the first time I have ever even seen a Power Commander, I started to wonder how they work. Does a Power Commander actually take the place of the OEM ECU or is it simply an add-on? The little I know about these units is that they just allow access into the system so the settings can be tweaked for more power/better fueling, etc.. In that case, the original ECU would stay in place instead of being replaced by the Power Commander.? If this unit replaces the ECU, I can stop looking for the ECU and just take the Power Commander to the shop. Anyway, I'm sure the folk here can lead me in the right direction. Thanks for any info.

First, welcome to the circus.
Sorry to hear of your health and scooter problems.

Realizing that time and distractions can cloud one's memory.
Do you remember where the Power Commander was located on the scooter and where the wiring connections were made when you removed it?

The ECU on Gen 2 FJRs is mounted underneath the bottom of the tool tray below the driver's seat.
There is one large connector on the wiring harness that plugs onto the ECU.
Remove the side panel on the left below the driver's seat and the cover over the airbox intake to see the ECU and its wiring harness connector.
The ECU will look like this.
https://www.ebay.com/itm/364979454814?_skw=fjr&itmmeta=01JDFNJDQPXCV9PC5BS0NWK85W&hash=item54fa78835e:g:1fUAAOSwyBFmgKy4&itmprp=enc:AQAJAAAA4HoV3kP08IDx+KZ9MfhVJKmnuAvMFaGgLEIqQcJcMfCEmsRQWANkIFp3IwPefBmPdkgUE+yZAHW1DeaK7UhIe6NwEb9ZOfyseaHVsoYukNt3qQUNk1v3Y1gKiYNJbNOiqunBR/3H688mdpN6XMce2XbIeTE7Hz01UBlcNjHsL2YzJyKj2+Ph6rftpJArO3AxZQIlvB80rEd4farX5wBQibA+edxIXcSD4fqcM544NYSBf2LfmC1kyoboS591H56Jlw26PZqs1tQNYfZkn4V5to0QNLy8aIMeW/AiC7BPYquh|tkp:Bk9SR_rbyfXrZA
You would probably remember if the ECU was removed since there is some associated disassembly of the tool tray to get to the mounting screws.

If the original ECU is lost or not found this ECU would make a good replacement. If you should have to buy a replacement ECU, one from 2008 - 2012 would be a good choice since it improves some of the fueling issues from the 2006 - 2007 ECUs.

This is not my ECU, and I have no association with the vendor or previous owner.


dan

 

[Dan Cooper]

A couple of other things I didn't touch on earlier.
When you turn on the key does the dash light up and the gauges make a full cycle sweep?
When you press the start button does the engine spin with authority?
Is the Kill Switch in the Run position?
Are you sure you have a known good battery?

If I remember correctly, and I may not, I think there was a recall for the ignition switch on those models. Has that recall been done? Entering your VIN on the Yamaha website will tell you if recalls have been completed or ask the dealer mechanic to check.
There was also a recall for the S4 ground spider wiring modification.

dan

 

[RossKean]

The PC III connects in-line and does NOT replace the ECU. There is no reason why you would remove the ECU. If you disconnected the PC III and didn't reconnect the injectors then the bike wouldn't run. The attached file is the installation instructions for the Power Commander III USB.

Full information here:
https://www.dynojet.com/power-commander-iii-usb-for-2006-2008-yamaha-fjr-1300-419-411/

 

[fossilrider!]

Wow, thanks guys. New battery. Kill switch in on position. When I was working with it (1 1/2 year ago) the engine spun great, and the gauges did a full sweep, but the fuel pump never made an attempt to turn on. The pump would not energize before I took anything apart, that's what started this whole ordeal. When the tech called me about the ECU, he did say there was a recall on a part of the ground wiring but the part (sub-harness?) is on back order. I bought a shop manual and traced the wiring as best I could and, if I remember correctly, I found that a yellow/black wire ran from the relay back toward the pump but it went into the harness and I couldn't see where it ever came out and made it to the pump. About that time is when I got derailed. I take it that the later '08-'12 ECU is a plug and play on the '07.? I see some on ebay that some are listed as '06-'12. I take it there is a different part# for the '06-'07 and the '08-'12.? I will get back to my shop again tomorrow and search some more, but I think if I removed it (which I obviously did) it should be right in the area where the bike and all other removed parts have been sitting for over a year. Very puzzling.? Also, the tank, seat, heat shield (under the tank) tray under the seat, and side fairing and lowers are still off. I told the tech that I just needed him to get the pump working and I can put it all back together. Thanks again for the input and info.

 

[Dan Cooper]

Wow, thanks guys. New battery. Kill switch in on position. When I was working with it (1 1/2 year ago) the engine spun great, and the gauges did a full sweep, but the fuel pump never made an attempt to turn on. The pump would not energize before I took anything apart, that's what started this whole ordeal. When the tech called me about the ECU, he did say there was a recall on a part of the ground wiring but the part (sub-harness?) is on back order. I bought a shop manual and traced the wiring as best I could and, if I remember correctly, I found that a yellow/black wire ran from the relay back toward the pump but it went into the harness and I couldn't see where it ever came out and made it to the pump. About that time is when I got derailed. I take it that the later '08-'12 ECU is a plug and play on the '07.? I see some on ebay that some are listed as '06-'12. I take it there is a different part# for the '06-'07 and the '08-'12.? I will get back to my shop again tomorrow and search some more, but I think if I removed it (which I obviously did) it should be right in the area where the bike and all other removed parts have been sitting for over a year. Very puzzling.? Also, the tank, seat, heat shield (under the tank) tray under the seat, and side fairing and lowers are still off. I told the tech that I just needed him to get the pump working and I can put it all back together. Thanks again for the input and info.

Yes, all Gen 2 ECUs are interchangeable plug n' play. The early Gen 2 ECUs (2006 - 2007) were throttle finicky with somewhat lean fueling maps, which is why some added the Power Commanders. The later Gen 2 ECUs (2008 - 2012)(and especially 2010 - 2012) have better suited fuel maps and may negate the need for the PCs.
Many of the E-Bay vendors are not knowledgeable about the specifics of every part on every scooter for every year of a model run. They list many parts incorrectly for some generations of scooters lumping all years together. Be sure to check the details of the listings about the specific year model a part was removed from and if no specific year is listed, just move on to the next listing.

If the tool tray under the seat is in your shop, the ECU is very likely still attached to the bottom side of it.
The service tech will most likely need the ECU to get the fuel pump running.
If the tank is in your shop, how is the service tech supposed to get the fuel pump running?

Incidentally the fuel pump ground path is through the S3 ground spider and subsequently through the "Dreaded" S4 ground spider. If either of those spiders are damaged / burned there will be problems with the fuel pump and possibly the fuel gauge. There may be other functions impacted further upstream from S4.



dan