so I'm riding my bike today and she starts to cut out randomly. Engine light comes on and goes off a few times.
get home check the codes:

P-Codes
P0107 MAP sensor failed low/open
P0118 ET Sensor High
P0134 Front Oxygen Sensor Inactive
P0154 Rear Oxygen Sensor Inactive
P1353 Front Cylnder No Combustion
P1356 Rear Cylinder No Combustion
P0031 Front HO2S low/open

U-Codes
U1301 ECM Serial Data High

Checked both the (+) and (-) cables to make sure all connections are good.
seems like one of my sensors has a short causing all these codes.
I was told that the speed sensor is a known problem for shorting.
Anyone got any ideas where I should start?

bike is a 2013 Street Glide
mods: air intake, exhaust, Cobra Fi2000 tuner and cams.

none of the mods are new they have all been installed for years.

thanks

 

Check your system relay, and by check it, I mean replace it and see if that helps.

Y/GN wire is from system relay, directly powers several things, and also ECM

 

Thank you, I will give that a try.. do you happen to know approximately where on the bike it is located?

 

In the fuse block.
You might start by pulling the left side cover off, pulling off the fuse block cover, and one at a time (unless you have a good memory and/or can read that small print on the fuse block cover) pull every fuse and every relay, clean them, put a dab of dielectric grease on them and put them back.
.

 

if the map failed, the engine would run off the burned in fuel curve and basically the engine would go into limp mode. that pretty much tells the ecu to ignor other input. i run gravity and gravity never fails but of concern is the data buss, without it working, the systems can not communicate. i rarely fool with the stuff to really remember the modes of h/l on the buss. going from other systems, i believe it to be a high signal from ecu to an addressed sub-component allows it to communicate, this way, the ecu controls which component is talking and not walking around in a crowd of data.
it could be almost anything from bad connection to failing component. the fsm electrical will be your friend.

 

Update:

I have replaced the system relay and so far so good. I have done 150 miles without any problems.

although if its a bad connection or failing component it could come back.

thank you for all the help so far

 

Glad it's working, if something comes up, just update this thread.

 

Update: So it wound up being a bad engine temperature sensor. Ever since I replaced it back in September I haven't had anymore issues.