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fxdf
08-07-2016, 03:11 PM
Im replacing the E C M on my fat bob do I have to replace any of the other modules if they are not bad. Someone was telling me if I changed the ecm I needed to also change the bcm because the two were married at the factory for my bike.

reggie rides
08-09-2016, 09:54 AM
Im replacing the E C M on my fat bob do I have to replace any of the other modules if they are not bad. Someone was telling me if I changed the ecm I needed to also change the bcm because the two were married at the factory for my bike.

You can learn the password for the new ECM.. here is the procedure..


Harley ECM Password Learn Procedure

When installing a new ignition(ICM) or ECM on a security-equipped Harley there is a "Password Learn" procedure that must be performed. This applies to all Twin Cam and V-Rod models with factory security but may also apply to Twin Cam's with EFI. The TSM/TSSM and ECM have "learned" passwords that synchronize the control module with several other components. Once you remove a component from this chain the module shuts down and won't start. This is reported to only occur with EFI models but the new 2004 carbureted models demonstrate the same shut-down when changing the ignition module.

Once you have installed the ignition module and reconnected the battery, perform the starting sequence as normal. The engine will cough once in an effort to start but will fail when the module shuts off the fuel.

Special Note: During the Password Learning procedure the ignition will remain in the "On" position for an extended period of time (30+ minutes). While "On", power is supplied to the headlight and running lights thus draining the battery. If the battery charge drops below a certain level during the Password Learn procedure the process will cease and you will have to start over. To avoid this connect a trickle charger to the battery throughout the procedure.