code

[roadkingdresser]

If the battery is bad,will it make the bike throw a code PO374. I tested the battery and it's at 11.27, but when I hit the start button it goes down to 7.23. Cleaned the terminals. If I put a jumper on it -it will start,but throws the code. Thanks. (O7 1200 Sportster)

[Coyote]

That could cause codes.

[fbn ent]

Charge the battery and try it again. 12.6 is a full battery and it shouldn't go below 9V or so when cranking. Either the battery is toast or the charging system is....14V or so when around 2000 RPM.

[roadkingdresser]

Tried to charge the battery,But it won't it won't go up to 12 and won't start the bike without help.Goin to pickup a new battery in the morn. What is the easiest way to get the battery out? Had a bad time just trying to titen the negative post. Helped a neighbor one time with his and dropped the bolt 3 times,never did find the bolts. Some times I think they build these sporties around the battery.

[fbn ent]

Gotta love those engineers....

[kd]

Remove the negative lead from the battery first and tuck it off to the side.  This will ensure you don't ground your wrench when removing the positive lead.  Reinstall in reverse with the negative last for the same reason.  If your wrench grounds out when installing the negative lead there is no spark or bad consequences.  If you leave the negative post on and ground the wrench while working on the positive lead the arc can ignite battery gasses and cause injury from a battery explosion.

[JerseyT]

It's been a long time since I worked on my son's Sporty so my memory is fuzzy, but as i recall, access to the battery neg terminal while the battery is in the frame is difficult.
The trick when removing the battery is to unbolt the negative terminal from the motor ground stud first.  Then, disconnect the positive cable from the + battery post.  Finally,  remove the battery with the negative cable still attached to the Neg battery post.  Reverse that process when installing the new battery.   

[roadkingdresser]

O.K. Got a new battery this morn.Started right up but when I go to throttle it-has a flat spot. Changed the crank sensor and the map sensor.But the PO374 comes up and can't clear it. where should I look next?

[Tynker]

O.K. Got a new battery this morn.Started right up but when I go to throttle it-has a flat spot. Changed the crank sensor and the map sensor.But the PO374 comes up and can't clear it. where should I look next?

Did you clear the code after you installed the new battery

[roadkingdresser]

Tried to but it won't clear.

[fbn ent]

  I would check the connection at the ECM to start with. It may be an issue with the wires to the CKS also. Just shooting in the dark here though.

I see with a quick Google inquiry into the P0374 code that '07 Sportster comes up in the conversations regularly. 

[roadkingdresser]

Well got the p0374 cleared now i got po107. might have to take the tank back off yo get to the plug on the map sensor. I hate this electronic bull crap.

[roadkingdresser]

GOT the PO107 cleared now it's back to PO374. Took the tank off and checked the plug and wires. Checked the plug at the ecm. Checked the wires cks. seemed ok. Not sure whats next?

[Coyote]

Check the 5 volt pin on your ecm and see if it's 5 volts.

[roadkingdresser]

which one would be the 5v pin? is there a searh for the plug diagram on here?

[Coyote]

Did you look in FSGs doc section?

[roadkingdresser]

How do i get there. went to his page porn came up!

[Ohio HD]

How do i get there. went to his page porn came up!

Really?   


FSG's Wiring Porn  

[kd]

How do i get there. went to his page porn came up!

Really?   


FSG's Wiring Porn 

That's Hilarious.   

[roadkingdresser]

That's better

[Coyote]

Wiring diagrams are quite a fetish. 

[roadkingdresser]

Tell me why these motorcyles have to be so damn complicated! Why couldn't they just stayed with points and condensor? I'm getting too old for this "Potty mouth"!

[roadkingdresser]

OK checked the pin this morning .542 volts

[Coyote]

Needs to be 5 volts for the sensors to work. Could be the ecm, short on the wire, bad sensor. Gonna have to disconnect sensors that use it and check.

[FSG]

How do i get there. went to his page porn came up!

Really?   


FSG's Wiring Porn 

    

[roadkingdresser]

Still no luck with this thing.Can't find which sensor is bad. Funny thing about it if it sits for a while it will start up and throttle like there's nothing wrong for a bit then it shuts down. Turn the key off and back on it will fire up,but won't run right.Stihl can't get the codes cleared, it either p037 or p0107. Driving me crazier!   

[rigidthumper]

That 5V R/W wire feeds sensor voltage from the ECM to the Vehicle Speed Sensor (VSS), Intake Temp Manifold Air Pressure sensor(TMAP), and the Throttle Position sensor (TPS).
Key on/run-stop switch in the run position, engine off: While measuring the 1/2 volt @ the R/W wire, try unplugging the VSS, and see if it gets to 5V (+/- .5V). If it does, the VSS may be shorted, causing this issue. If the voltage doesn't change, plug it back in, and unplug the TMAP sensor and repeat the measurement. Repeat this technique for all sensors on a specific wire.
Something has to be killing that signal- you'll find, I'm certain.

[bump]

Check the head temp sensor on front head

[roadkingdresser]

Can i just jump in along side the r/w wire at the plug under the seat with the ohm meter and go from there?

[roadkingdresser]

Well thanks to all ofyou I may have found the problem-speedometer sensor. No one has it so I had to order it. supposed to be here sat. I'll let you know how it works out. Thanks for the help.          

[Coyote]

If you unplug it does your 5volts come back? If so, clear the codes and see if they stay gone.

[roadkingdresser]

I unplugged it and 5 volts came back. Just walked out To the bike and cleared the codes.Shut it off and turned it back on no codes. When I pulled the plug out it was corroded on 1 post. Sprayed some cleaner in plug and the sensor before I took it out,still showed a code. Pulled the sensor out and looked at the bottom of it -had a small bubble on the surface. I'll let you know the new one is now coming fri.

[Coyote]

There ya go. You got it now. 

[roadkingdresser]

Got the sensor today,put it in and fired rite up and acually kept running and no codes.Have to take it for a ride tomorrow.Has a little sputter when I start to throttle it, but revs rite up.Don't know how old the gas may be,put some sea foam in it. Thanks for all the help I really apreciate you guys! Thanks again. I'm sure you'll hear from me again,just hope not tomorrow!

[Hossamania]

 

[Ohio HD]

A great site to contribute a few Shekels to, so it stays around.     

[roadkingdresser]

DONE

[kd]

DONE

   Now have a look around and check out the little extra benefits.

[Ohio HD]

DONE

Your a good man, thank you.