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/