When I was talking about external electric field and its action on the diffusion current I was talking about Resistance's one but it appears it is an internal resistance no electric field is present like a normal resistor. But reading Fundamentals of Microelectronics by Behzad Razavi and in its introduction of semiconductor, P and N Semiconductors( Or region) acts like a normal resistor (External electric field is applied to make a drift current inside it). But when mentioning about the diode, he only talks about drift current due to internal electric field of the depletion region of the diode. That's why I was asking about the resistance of the P and N region and Im still confused lol...
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