hi i have a 2002 mazda protege which says incorrect gear ratio p0730 help please!!! it starting giving me this code suddenly no warning signs etc the gears were not slipping or anything just one night while i was driving i felt the tranny downshift and upshift abnormally it was like the car was confused as to which gear to select!!
things i tried so far: flush out old tranny fluid was using redline d4, fluid was nasty btw. changed the filter under the valve body and put in fresh redline d4 around 3 and a half quarts anyways can anyone assist me with this problem thanks

Check your Speed Sensor.

ok i will 1st thing in the a.m btw your talking about the one by the tranny mount

any more assistance would greatly be appreciated can a shift solenoid cause erratic shifting?

Ok i checked the resistance between the terminals of the input speedsensor got 362 and according to the manual it should be between 250 and 600 ohms anyways what else can i try?

changed the turbine speed sensor whit a foreign used still no good a I got a mech/tranny guy to drive it today he said it feels like one of the shift soleniods is gone but when im checking with my multimeter for resistance it seems ok can that really be a problem??

Yeah is a possibility when you dealing with the tranny.

ok took out all the soleniods test them for resistance and current tested ok one note though soleniods d and e dosent click like the rest of the soleniods there shaped differently mabe they just work another way can anyone shed light on this?? becuz the manual said that all the soleniods sopposed to click when a 12v is applied to them thanks!!

l.f shift soleniods

hey, i am experiencing this problem on my mazda protege,even replaced the transmission and still has the p0730 incorrect gear ratio code,would like to know if you got through with yours.

Really ok well it could be a sensor problem like the tps etc 777-1424 call me or pm ur number we will chat!!

guys this problem could also simply coming from a bad connection at the harness or otherwise the mech is supposed to check the harness for continuity before he makes u buy a tranny it could be that the wires related to the particular sensor have a short or break just my $0.02

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never argue with an idiot they'll bring you down to their level and beat you with experience

Yep I checked all that before I did any Mechanical work but since the p0730 is a generic tranny fault code it code mean as simple as low fluid to slipping but thanks anyways anyone with this problem and would like some assistance sorting it out before they buy or repair their tranny can call me 777-1424 I'll share what i know and how i properly fixed mine!!