2006 f150 fuel pump driver module problems

#2006 f150 fuel pump driver module problems generator#
#2006 f150 fuel pump driver module problems full#
#2006 f150 fuel pump driver module problems code#

The fuel pressure instantaneous spike at the end of my WOT run would make sense if the vacuum would create higher than normal readings. Shouldn't the vacuum in the FRPS cause a high than normal pressure reading on the scanner? I figure the vacuum will pull the diaphragm up, same direction the fuel pressure would push it. If you disconnect the vacuum hose, then the gauge should match the gauge exactly.

Your gauge will almost always show you HIGHER than the FRPS, because of the vacuum hose. I did test the ignition coils and found a few cylinders with an open in the secondary at times. Hesitation was pretty bad, more intermittent than a constant hesitation which would also lead me away from the fuel pump or module. Friday I'll look at the scan tool history. I'd have to look since I think I saved the data.

#2006 f150 fuel pump driver module problems generator#

Tyler wrote: Hey graywave! What were you generator codes? 13.3V sounds a bit low for this system, since desired is usually 14V. I'll just have more info for when I see one of these systems again. The owners of the truck are getting rid of it since it also has body rot and the transmission slipping in and out of gear (unrelated to the hesitation, different symptoms) so I won't see it again. I have a pretty good understanding of the system now. You answered other questions I had and confirmed other observations and thoughts. I've never seen the command signal go over 50%.ДЄll in all my diagnosis was a bit flawed as I didn't know about the O2 readings with this particular system and didn't fully understand this FPDM system.

#2006 f150 fuel pump driver module problems full#

Make sense? Your lowest reading of 67% was actually 43%, which equates to 86%, which is about as close to full fielding of the pump as the FPDM will get. When you saw 86%, you were actually looking at a 14% duty cycle, which equates to a 28% duty cycle of the fuel pump by the FPDM. There's more info about this circuit in here: If the signal were at 0%, 25%, 75% or 100%, then the PCM would flag a FPDM code. The FPDM return at 50% duty cycle is completely normal, no worries there. The O2's also sound reasonable, as not every system will switch to open loop right away upon WOT application. The fuel pressure staying at 37-39 PSI, and spiking after a WOT run, is normal in my experience. Hey graywave! What were you generator codes? 13.3V sounds a bit low for this system, since desired is usually 14V. Not sure if these symptoms line up with a bad FPDM I know these have huge common faults with the Fuel Pump Driver Module Corroding. Depending on if I can put time into this issue, I'd like to T my fuel gauge into the system some place to get mechanical readings. I am wondering what ACTUAL fuel pressure should be under load and at idle. I'm used to looking for 50-60PSI but this system specs at much lower pressures. 86% on the labscope would be 14% command to the FPDM? I didn't try swapping my leads around, thinking that possibly my NEG and POS lead on the scope should be swapped to get a different % or maybe that wouldn't matter.Д«asically I am a little new to this system to be honest. I am thinking that maybe I should be reading this the other way around. Now this confuses me as I was expecting this to be low and INCREASE.

PCM to FPDM Control Signal Starts at 86% and drops as load increases. FPDM Return Fault Signal Wire: 50% at all times. The initial instantaneous romp on the throttle, both Upstream and Downstream O2s will read full lean for a second till the truck starts accelerating.ДЇPDM Fault Return Signal Wire (PIN 30) and PCM to FPDM Control Signal Wire (PIN 62) probed at PCMДЎ. Bank 1/2 Upstream O2 Sensors will NOT read rich during WOT until the FRPS reads 49 PSI. At some point, usually just as I let off the throttle at the end of my WOT run the FRPS will spike to 49 PSI Fuel Rail Pressure Sensor PSI at WOT: 37-39 PSI Fuel Rail Pressure Sensor PSI at idle: 37-39PSI NOTE: Vacuum line connected to FRPS during pressure readings

Last voltage test I saw was 13.3v at idle

#2006 f150 fuel pump driver module problems code#

Only Generator fault code which could be a cause if voltage drops. Slightly Rough Idle - Some light misfires on all cylinders which I can only pick on the the cylinder contribution test on the scan tool. My knowledge is a little low on fords FPDM fuel system. Ive been doing some tests to familiarize myself with fords FPDM fuel system. I have an 2007 Ford F150 which has hesitation and misfire which was not brought here for this condition so the boss may not want me to put much more time into it.