This post is to clear up some conflicting information I have seen on these boards.

For CEL and Emissions purposes you may need/want to add an FTP

You DO NOT NEED TO SWAP FUEL TANKS TO ADD THE Fuel Tank Pressure Sensor

You CAN add a Fuel Tank Pressure Sensor FTP and to the stock fuel tank.

All you need is the Fuel Tank Pressure Sensor, EVAP Bypass Valve, EVAP Canister with valve solenoid on it , and to wire it up.

You could replace the floor harness to a model with an FTP OR wire it yourself (get a service manual)

You may also need to wire up EVAP Canister with valve solenoid on it (wires come from ECU) IF the plug for it is NOT on your engine harness

Post questions if you have them.

 

can you not just jumper a wire so that the ECU thinks you have pressure all the time?

 

more info it would be needed. where is the FTP sensor located, pics welcome

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 2point2 &raquo;</TD></TR><TR><TD CLASS="quote">can you not just jumper a wire so that the ECU thinks you have pressure all the time?</TD></TR></TABLE>

Yes you can, but it is not 100% reliable. A potentiometer can be install at the ECU(and dial in the voltage it needs (0.5V?))BUT the ECU gets picky about having the same voltage all the time, and will throw the code anyway, sometimes.


Modified by 96BlackHB at 2:04 PM 4/3/2006

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by onefstek &raquo;</TD></TR><TR><TD CLASS="quote">more info it would be needed. where is the FTP sensor located, pics welcome</TD></TR></TABLE>

The FTP and EVAP BYPASS are on the front left corner of your fuel tank. They are covered by a plastic splash guard. YOU CAN GET THEM OFF FROM UNDER THE CAR.

FTP=#1
EVAP BYPASS=#2, #10
and all associated hardware



EVAP Canister with valve solenoid on it=#11, #13

 

When the ECU runs the EVAP monitor, it generally looks for a change in FTP output. The ECU shuts down a valve to let pressure build inside the gas tank, which should mean that the FTP changes. If it didn't change, that would indicate that a hole could be present in the EVAP plumbing.

You can try to use an potentiometer, just don't count on it working since it's staying static in value.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EE_Chris &raquo;</TD></TR><TR><TD CLASS="quote">When the ECU runs the EVAP monitor, it generally looks for a change in FTP output. The ECU shuts down a valve to let pressure build inside the gas tank, which should mean that the FTP changes. If it didn't change, that would indicate that a hole could be present in the EVAP plumbing.

You can try to use an potentiometer, just don't count on it working since it's staying static in value.</TD></TR></TABLE>

Good to know the reason for the potentiometer unreliability
Thank you for contributi ng

 

*walks away from thread*

 

If u can get your hands on a 96 ls computer, that will do the trick.....

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by powerfulperformance &raquo;</TD></TR><TR><TD CLASS="quote">If u can get your hands on a 96 ls computer, that will do the trick.....</TD></TR></TABLE>

That is great info for emmisions/obd2 scans!

I would not use it too long on a vtec motor though, who knows how the LS fuel and ignition maps run those motors (run lean?)

 

It you want vtec then u can use a P30 from a 96 del sol Dohc

 

I know this is an old thread but im having the same problem i just swap out the engine harness on my 98 civic and i keep getting the P0453(91) CODE on my car because the engine harness i used was of an 96 ex and it dosent have an plug for the evaporator in the engine bay and my fuel gauge keeps going up and down can any body please tell me what to do .thank you

 

bump...having same problem. pix would be nice and a more into depth on how to fix this problem without a potentiometer or swaping ecu too would be nice.

 

bump

 

bump...no one knows!?....how come them 96 hatch gsr swaps don't throw a code. i know they have to the same ecu when BARing the car.

 

bump...all these ek hatch swaps and no one knows how to fix this?!....someone has to know

 

i am going to keep bumping this subject till i get a answer...all these people doing k swaps and building up b series have no answer? i know someone on earth has to know the answer.

 

99 dx hatch, have run a 99 p75 ecu when I had just a ls swap. I currenty have a ls/vtec and have run a couple of obd2a p72's and I have never run into the issue.

 

super old thread but been stuck with this issue for the last month, 99 hatch with 99 b16a2 code 90 pops up after 200 miles. can anyone help me out on how to fix it? pictures ?

 

i thought it was only when using an integra ecu?
it should be code 91 not 90