I have a 2002 Mazda protege 5, 2L engine, automatic 4 speed transmission (with Manual shifter) (4F27E) with 71000 miles. I started with intermittent losing 4th then after awhile it would not go into 4th. When it was time to go into 4th it would just go into neutral. I could shift over to manual (tiptronic) and shift into 3rd to continue to drive. It comes up with an error code PO 762 or 767. It is hard to tell the difference between 2nd and 3rd. I figured one or more Shift Solenoids were bad so I replaced all 6 of them with no change at all. I tapped into the wires going into the transmission and directly to Shift Solenoids A, C, D, and E and measured when the solenoids were applied voltage. I compared that with a Shift Solenoid Application Chart (see attachment) and mine was correct with one exception - A was supposed to have voltage in reverse and mine did not (can't see that that would make any difference). Solenoid A had 12 volt application voltage and C, D, E had 4 volts. 4 volts was plenty - I made a test on that type solenoid and 2 volts or even less would operate it. At one time I thought the PCM (Powertrain Control Module) was at fault because of the lower voltage on C, D, and E but 4 volts is fine. Besides, these solenoids measure only 3 ohms or less that means if 12 volts were applied it would be drawing 4 amps or more. If anyone has any thoughts on other simply tests I can make before I declare 4th gear (speed or whatever) is totally gone and have to replace transmission. This would be way more than the car is worth. I still drive it and can go 60 mph if necessary, usually just around town.