Po 193

[charles546]

I know im in the wrong forum but couldnt get any help in the freestar forum.have always got help here for my tarus.trying to help freind with van.i cant find the port on fuel rail to get a fuel pressure reading.it is nothing like my tarus.saw astem sticking up on front right of rail but it has somekind of covering over it.didnt want to break something prizeing on it without getting some advice.i know someone in this forum knows how to solve this problem.it is a 2005 freestar with the 3.9 motor.almost forgot that.any help appericated.

Thanks again charles

[65comet]

My last Windstar was 1998 and had the Schrader valve. My 2005 Expedition does not have a Schrader valve. It has a Fuel Rail Pressure Sensor that has an electrical connector that sends to the PCM the fuel pressure and also has a vacuum line that sends the related vacuum information to the PCM for use in determining how much fuel pressure to feed. Hooking up to the ODB II will give you the fuel pressure reading. If you want to use an outside meter, you have to install an adapter underneath the Fuel Rail Pressure Sensor is what I have read. Since I'm not familiar with your year Freestar, I can't say that it is the same.

[shorod]

There is no service/pressure port on the 2005 Freestar according to the factory service manual. In the manual, if pressure readings are required, the technician is instructed to install an "Adapter Spring Lock Coupling (310-100)". A professional scan tool should be able to monitor the fuel rail pressure utilizing the fuel pressure sensor that Comet mentioned above. Considering the description for a P0193 diagnostic code, seeing what the pressure sensor is reading would be prudent.

Description: The comprehensive component monitor (CCM) monitors the FRP sensor circuit to the powertrain control module (PCM) for high voltage. If voltage exceeds a calibrated limit for a calibrated amount of time during testing, the test fails.

Possible Causes:

• FRP signal shorted to VREF or VPWR
• FRP signal open
• Damaged FRP sensor

Diagnostic Aids: An FRP signal high condition can be caused by any number of conditions, including a short on FRP signal to VREF, a more positive voltage level, an open FRP signal or signal return. The FRP signal line is pulled up by the PCM and VREF at the sensor, and down by the sensor through SIGRTN.

-Rod

[charles546]

Thanks guys i knew you would come through with the information i needed.we are going to change sensor first .found one at salvage yard for 15.oo dollars.thought it would be good place to start.just dont know any honest shops around here.

Thanks again charles

will post if problem solved/

[charles546]

follow up on the freestar changed sensor have put probally 500 miles on it. light has not come back on seems to be running fine now.thanks again for the help.still no better place to go with car problems than this site it has great people on the forums.

charles

[shorod]

Thank you for following up on your post with what you've found! Congratulations on fixing the issue.

-Rod