i have fitted a hks fuel cut defender to my93 wrx. it was fine untill i turned the engine off and back on. I got a check engine light. after about ten mins of driving it goes off again. Why does it do this? the 12v feed is from the cigarette lighter and the earth is to the negative post on the battery.

 

Best bet would be to read the ECU error code

See here

JGM

 

It also depends if you can connected the FCD correctly. Off the top of head there is 4 wires, +12v, Ground, Map sensor signal in(From Map sensor), Map sensor signal out(From FCD to ECU). The FCD then changes the map sensor signal so to make the ECU think there is less boost.

 

cheers mate is there any way of checking that i have got it wired up correctly. any tests i can do

 

Post where you have connected each wire, you have already said that you have connected the +12v to the cigarette lighter.

 

Try powering it from the 12V feed to the ECU, so that it powers up with the ECU.

 

i have connected the 12v feed to the cigarette lighter, the earth to the negative (earth) post on the battery and the two for the fcd to 'cut' in to the pressure wire on the ecu. I have got the fcd set at 6. cheers for your help guys

 

btt

 

ttt

 

Have you definitely got the Map sensor wires to the FCD connected the right way round ie the pressure signal wire should be cut, the FCD should then have a IN and OUT wire, the IN should be connected to the cut wire coming from the loom to the ECU and the OUT should be connected to the cut wire going to the ECU. If this is ok, the next step would be to check the ECU fault as JGM has already said by connecting the diagnostic plugs under the steering column

 

i think that i have and i tried them on both ways yesterday. is there any way of checking that i have got it wired into the correct wire. I can't seem to find the two wires i keep hearing about any chance of a photo mate