Question about Ford Cars & Trucks
SE edition Canadian parts equipped with ax4n trans, 3.9 liter engine
There's a website that has all this information about all this and manuals everything totally free there are many actually but I personally like few reliable-store for eg . .. let me know if u need help
Posted on Feb 25, 2019
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Posted on Jan 02, 2017
i will try to help. 171/174 indicates lean condition in engine. the mass air flow sensor is located in the rubber tube going to throttlebody. you can try to clean it. using mild carb cleaner safe for sensors, remove sensor from tube. spray clean the tiny wires located in the cylinder. do not touch them, they are very delicate. these engines are also notorious for leaking intake gaskets and faulty pcv valves. these will all set these 2 codes. feel free with anymore questions.
Posted on Nov 15, 2008
I had the same problem and apparently fixed it by mistake. I replaced the cruise control deactivation switch under the master cylinder, hoping the cruise would be fixed. Some how with that the "trac off" light went out and gave me the ability to turn it on/off from the button again. The part was $30 from the local dealer and easy to replace. Before you run out to replace the switch check the connections on the old one. It plugs in upside down which may accumulate water from puddles and things causing connection issues ( a known problem ).
Posted on Sep 23, 2009
SOURCE: getting p0193 code for my
P0193 is "Fuel Rail Pressure Sensor Circuit High Input"
Meaning: Car's computer is reading input voltage from the FRP (Fuel Rail Pressure) sensor as
voltage out of the acceptable range, because the voltage is too above the acceptable range.
assuming you are running gasoline...
check for fuel in the vacuum hose of the FRP sensor after running engine at idle for 2 minutes. if not, check fuel pressure. Check fuel pressure by connecting a fuel pressure gauge to the Schrader
connector on the fuel rail, which you will find under a small (black, usually) plastic protective cap.
If the fuel pressure is indeed too high, your fuel pressure regulator has gone bad.
if fuel pressure is good, check voltage between Sensor connector Vref (Pin#3 LB (light blue)) and
Signal Return (Pin#4 GY/RD (gray/red)), which should be 4.0V-5.5V with key ON.
The acceptable voltage range from the FRP sensor to the car's computer is 4.0-5.5 volts.
What the P0193 code is saying is that the voltage from the FRP sensor is over 5.5 volts,
and therefore it's "High Input."
If voltage from the FRP sensor is bad (out of range high, presumably), then replace the FRP
sensor and reset the OBD-II code.
If the voltage output from the FRP sensor is also good, the car's computer is kaflooey, so
you'd need to replace the car computer (which is costly), so replace the car's computer as a
Posted on Jun 21, 2011
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