hey guys im in desperate need here. my 98 ex is getting a p0452 code. ive replaced the ftps, changed 3 way valve, changed gas cap. wiring or ecu? or anything else? help!!!!

 

Double check the vacuum connections at the tank and at the engine, there should be a diagram sticker somwhere under the hood. Make sure the connection at the sensor is clean, and that it has a ground. (Would be a good idea to check a service manual, but one wire should lead to ground.) If you get ambitious, you could check continuity between the sensor connector and the ecu. If you happen to have a spare ecu handy, swap it out and see if it goes away. Another thought, is it possible your tank has a hole in it? If there is no hissing sound when you take the gas cap off there is probably a leak somewhere.

 

i checked continuity by running a wire from sensor plug to ecu and it beeped, been trying to find an ecu

 

anyone?

 

Did you check all three ftps wires?

 

yep 1-2 was 5.12 v and 2-3 was 3.81, which honda said was ok, and then i checked the continuity from #3 to ground and no beep so that says the ecu maybe bad, but then i checked the 1-2 again and i got .05v and still 3.81 to 2-3 so im alil lost

 

ok i think i found my problem, my car is originally an hx(y5) now its a y8. ecu and engine harness. some of the green ecu wires dont match(c131) should i rewire the green plug from the y5 harness? help

 

Do you think maybe the ECU wasn't replaced? Maybe there was an engine swap but not the ecu. That could definitely throw codes at you.

 

nope ecu was replaced i did it all. i just got another one to double check. that green plug 131 the wires dont match, the ftps wire isnt in the same spot when plugged in. so should i splice in the original 131 plug?

 

Or just switch the wire to the correct hole without having to splice in the entire plug