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Old Mar 26, 2022 | 04:39 PM
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Default ECU flash
I have a 2007 Sportster 1200 needed an ECM so bought a parts bike. All I had to change was TSSM and ECU as long as I had the key fob should work correct? Have tried this the bike will start but die after 3 seconds not sure what is going on. The security light seems to stay on but the bike will start so I do not think that's my issue
 
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Old Mar 26, 2022 | 05:11 PM
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OK rest of the story why were you buying a Used ECM and TSSM ? And trying to put it on your bike?
 
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Old Mar 26, 2022 | 06:30 PM
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My ECU was bad. The ECU I purchased also came with a FP3 so I didn't want to flash it is why I changed TSSM.
 
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Old Mar 26, 2022 | 06:59 PM
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Originally Posted by dcaplinger
I have a 2007 Sportster 1200 needed an ECM so bought a parts bike. All I had to change was TSSM and ECU as long as I had the key fob should work correct? Have tried this the bike will start but die after 3 seconds not sure what is going on. The security light seems to stay on but the bike will start so I do not think that's my issue
You need to password learn it. Here you go. PS you will need to assign your fobs if using your old ones and you changed the TSSM. I highly advise having the bike on a tender or trickle charge when doing this (or remove the headlight fuse)
 
Last edited by Ed Ramberger; Mar 26, 2022 at 07:13 PM.
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Old Mar 26, 2022 | 07:05 PM
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Thank you. This is needed even if everything coming from same bike.
 
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Old Mar 26, 2022 | 07:45 PM
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Originally Posted by dcaplinger
Thank you. This is needed even if everything coming from same bike.
Well if the ECM is for an 883 and you installed it in a 1200, the fueling is completely off and it could start and die. My answer was based soley on your description of the issue assuming you have already ensured all other things are equal.
 
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Old Mar 27, 2022 | 10:12 AM
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Yes all other things are equal. Should have the right map or tune on it. So I shouldn't have to get it reflashed? An ECU can be installed in another bike as long as the tune is the same and it will work? I know in a car you have to get an ECU flashed to match the VIN due to the other modules such as BCM for it to work.
 
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Old Mar 28, 2022 | 03:52 PM
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It was the password learn. Bike starts now thank you. Now I'm getting a problem where the bike will idle all day but give it any gas and it dies. Have replaced tps sensor already. Maybe vacuum leak? If I move the map sensor my idle changes on a vehicle that is typically a vacuum. Not sure yet any suggestions?
 
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Old Mar 28, 2022 | 05:16 PM
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Originally Posted by dcaplinger
It was the password learn. Bike starts now thank you. Now I'm getting a problem where the bike will idle all day but give it any gas and it dies. Have replaced tps sensor already. Maybe vacuum leak? If I move the map sensor my idle changes on a vehicle that is typically a vacuum. Not sure yet any suggestions?
Check ECM Codes. Document them. Clear them. See which ones return (if any)
 
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