Honda prelude a/t transmission

d4 light indicates electronic transmission failure but this can b as simple as low transmission or old fluid . change fluid if its dark or watery, before you panic.(( use only honda brand atf,)) if that doesnt work the codes need to b considered this can b done by jumping the two pin connector under or behind the glovebox with a paper clip the d4 light will flash once you turn the ignition on to first position' when dash lights first come on . it will flash then stop then flash again you need to count the first and second separately this will give you 2 diget code look it up exp; honda d4 dtc 34 just say google it , but if i were to guess if not the trans fluid the codes will b for sift selinoids easy fix but no fun to change. good luck. you will need a scanner for the check engine light uncommon for both to show up at the same time two diffrent systems ,disconnect the battery for 30second this will reset the ecm, it maybe a false code and it may not return.

Usually it means the speed sensor in the transmission is failing.
The blinking light means your overdrive may not work.

If the D4 light is flashing, you have a transmission control failure and you need to get your transmission and transmission control system checked out.

if your d4 light started flashing, then that means a transmission sensor is failing, which causes your transmission to act funny.ill get back to you with a method on checking them and a list of codes to get you started, but dont go and ask for a new transmission. it might not be necessary.

you have a transmission fault the D4 light blinks to tell you that there is a transmission problem when the light is blinking the transmission computer put the transmission into limp home mode so it will not shift normally and you should try not to drive it very far when it gets to this stage you need to have the transmission codes check to pin point the problem

you have a problem with the linear solenoid on the trans. it needs to diagd properly to c if its broke, or shorted wire, or disconnected

hello, question i need to know in order to help u.
when u fitted box, was this a cable type to help change the gears or is it electronic.
once i know this i can tell you how to rectify or test for a bad transmission.
get back to me.

the trans will actually bolt up to the engine..but it will not work properly without the pressure switch plugged in to the harness... if u notice, there is a hole with no threads in the prelude trans..u couldnt even thread a 3rd gear pressure switch in the trans case..trust me ive seen it b4 at the dealer where i work.. i even went as far as installing the trans and when going back together, saw the difference when trying to plug the harness in...its not the same..i laugh about it now, but was very mad at myself at the time for assumeing the parts guy brought me the right part..the guy with the prelude was about to install my accord  trans in his prelude ...luckily i was able to stop him b4 he installed my trans in his prelude...i laugh about it now

LOOK AT THE TRANS CABLE, IS IT DAMAGED? IF SO REPLACE OR HAVE IT ADJUSTED OR REPAIRED.

run it on d4