Chasing electrical issue (fuel pump/ECU)

[TallPaul]

ST-Owner Group Members,

Just want to start out by thanking all of those that have provided help already and sent over resources on how to track down this fuel pump / electrical issue I am dealing with on my '09 ST1300PA.

Using the fuel pump troubleshooter guide, I was able to figure out the different relays and which components do/don't have power.

Specifically the brown 12v from the fuel pump is not getting power while the bank relay sensor is getting all proper power/grounds.

Following the answer sheet I had been provided with, it states that my issue is being caused by a bad switch somewhere else on the bike, kickstand or clutch, neutral safety switch etc. I have been checking these but finally determined that the issue is likely the ECM itself.

I see how expensive these things are online and am ready to throw in the towel and pick up a new ST altogether.

The trouble that I am having is the fuel pump is not priming. If I jump the ground cable on the relay, it does get ground and you can hear it prime when I turn the on/off switch.

Is there anyway I can bypass the ECM or any other fixes for this besides replacing the ECM itself? I understand that the ground connector is within the circuitry of the ECM and it is sealed and can't be fixed.

Any help is very much appreciated.

 

[Andrew Shadow]

Remove your air cleaner assembly and check for damaged wires under the throttle bodies, especially the wires to the fuel injectors. Any defect detected with the fuel injectors causes the ECM to disable the fuel pump until the defect is no longer detected. Mice like to eat these wires.

 

[TallPaul]

Remove your air cleaner assembly and check for damaged wires under the throttle bodies, especially the wires to the fuel injectors. Any defect detected with the fuel injectors causes the ECM to disable the fuel pump until the defect is no longer detected. Mice like to eat these wires.

Have the airbox off and inspected the wires. Made sure everything was plugged in but I guess I should do a continuity test on those as well. Thank you.

 

[dduelin]

Just for grins check the condition of the green wire going into and out of the white 24 pin connector located above the left valve cover. A toasted or crispy ground (green) wire is known to cause random electrical problems. When my 2005 ST was exhibiting strange electrical issues including shutting down the fuel pump I eventually jumped the green leading out of the connector to good ground and the fuel pump spun up. Running again!