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The connectors for the ECU itself is on the firewall, top passenger side, and accessible from the engine bay.

The ECU can be electronically accessed from the OBDII port, but IIRC only using the ConsultII program or the autoenginuity.

Why exactly are trying to find this information out? I may be able to help you out alittle further or point you in the right direction.

Also, which model Sentra do you have?
 
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