Car jerks, then N light flashes while driving

Car jerks when put on Drive. While driving, when car jerks, the N light flashes and car appears to be in a "limp mode". I borrowed a couple of OBDII Code Readers but both says can't connect. I jumper-ed pin 1 and 4 on the 16-Pin DLC connector, and I got continuous blinking on the Engine Light, but the N light gives 2 long and 2 short pulses [Code 22]. Is it correct to say that the fault is the crankshaft position sensor? Is there a way to test this sensor first before attempting to replace it?

In another jerking instance, I got the following codes after jumpering 1and 4 pins: Engine Light=14, N Light=14, 22, 44. Which is the most probable cause of the fault?