FTP Sensor P0452
 

I'm getting a p0452 fault on my 2002 Escape 3.0 V6 2WD. From what I've read, that seems to indicate low FTP signal below .22v. As I thought I understood it, the FTP sensor has 5 v applied, and the output voltage from the FTP to the ECU goes down as tank static pressure increases. Conversely, I had read that the voltage from the FTP to the ECU goes up as tank static pressure decreased (for the vacuum leak test measurement). Now, I read elsewhere, just the opposite (voltage out of the FTP increases with pressure increase and visa versa). Anyone know which, for sure?

I read that the approximate voltage at atmosphere (engine not running, vent valve open, etc) is about 2.5 v. Considering that, I'm guessing the "less than .22v minimum" signal back to the ECU might look more like either the signal wire shorted to the frame somewhere or the signal wire open (maybe corrosion in the connector).... Any thoughts?

Also, does anyone know where the FTP sensor is located on the Escape and how to access it?

Thanks,
Dave

How are you getting these measurements?
Are you using a scan tool?

The fuel tank pressure sensor is located under the rear of the vehicle. It could be mounted to the top of the fuel tank using an "O" ring, but is more commonly mounted inline in the vapor line between the fuel tank and the evap canister.

I got the code from a code reader. The p0452 code it listed as "FTP Sensor below minimum output, less than .22v".

Dave