cmed250f

Well yesterday after a 4 hours drive home i pulled into my driveway and right as i did the check engine light came on.....ran code reader and came back with the code for low voltage to map sensor. i have a edge comp box(just to let you guys know). I started narrowing down the problem and am stuck. i disconnected the edge box still does it.... changed inline fuel filter and one under hood. I have a holly blue lift pump that seems to be working fine can hear it pumping away. I checked the voltage on the map sensor and it reads 5 volts from the orange wire. I removed map sensor and it was very clean didnt need to spray it with break fluid. I have also tried to reset the apps on the truck and still have nothing....the code will not clear as well...im lost right now please dont tell my im in for another vp...any advice is greatly appreciated

BigIron70

While monitoring the scan tool, jumper the (F855) 5-volt supply circuit to the (K37) signal circuit in the Map sensor harness connector
Did the P0238-MAP SENSOR VOLTAGE TOO HIGH, DTC set? Replace the MAP sensor

cmed250f

Im at work right now but will try jumping the power to the signal circuit when i get home...it was reading MAP SENSOR VOLTAGE TOO LOW. i dont exactly know what you mean by it being set...Thats my next step to just replace the thing

got_soot

couldnt this be a apps sensor problem

cmed250f

im gonna check out the apps sensor next they only thing i dont understand is i used to run my truck with the map sensor unplugged like a bunch of people do and the truck ran fine so how would the sensor being bad makeit do this

got_soot

So what did you find out?

cmed250f

well im waiting for a mapp sensor and a apps sensor to come in from my local napa hopefully ill beable to return them if they dont do the trick but i feel as if i should try and replace both of those before i tear down the truck and beat my head against the wall looking for a chafed or cracked wire.....has anyone has similar issues

ps: this might help the truck in park will idle fine and will rev out as much as i wanted just as it normally would do....this problem is only under load....

got_soot

usually napa is pretty nice about taking stuff back for me, also i hope its only a sensor and not a pump.. keep us posted!

cmed250f

hey guys sorry its been awhile the napa by me actually got the mapp sensor in and then they lost it i wouldent belive it but anyways i got some good news replaced the old mapp sensor and truck runs better than ever very happy it was only this ended up being 110 bucks so it was a relief. I guess the sensor didnt only malfunction electrically but physically too

got_soot

well thats good news and glad you fixed her...good luck...