HELP PLZ
Fleet Mechanic
Joined: Dec 2006
Posts: 1,925
Likes: 10
From: Phoenix, AZ
In the picture in this link, it shows where the pcm relay is:
http://ww2.justanswer.com/uploads/er...uel_heater.png
It's the bottom right relay in the underhood fusebox panel. You can switch the pcm relay with the horn relay (if your horn works) to see if maybe your relay is bad.
If your WTS start light is NOT coming on, then there's a 99% chance that you are not getting power to the PCM so you should spend your time trying to get the WTS light to come on first, so you know that you are getting power to the PCM.
http://ww2.justanswer.com/uploads/er...uel_heater.png
It's the bottom right relay in the underhood fusebox panel. You can switch the pcm relay with the horn relay (if your horn works) to see if maybe your relay is bad.
If your WTS start light is NOT coming on, then there's a 99% chance that you are not getting power to the PCM so you should spend your time trying to get the WTS light to come on first, so you know that you are getting power to the PCM.
Thread Starter
|
Fleet Mechanic
Joined: Nov 2007
Posts: 1,263
Likes: 11
From: DARTMOUTH MA
In the picture in this link, it shows where the pcm relay is:
http://ww2.justanswer.com/uploads/er...uel_heater.png
It's the bottom right relay in the underhood fusebox panel. You can switch the pcm relay with the horn relay (if your horn works) to see if maybe your relay is bad.
If your WTS start light is NOT coming on, then there's a 99% chance that you are not getting power to the PCM so you should spend your time trying to get the WTS light to come on first, so you know that you are getting power to the PCM.
http://ww2.justanswer.com/uploads/er...uel_heater.png
It's the bottom right relay in the underhood fusebox panel. You can switch the pcm relay with the horn relay (if your horn works) to see if maybe your relay is bad.
If your WTS start light is NOT coming on, then there's a 99% chance that you are not getting power to the PCM so you should spend your time trying to get the WTS light to come on first, so you know that you are getting power to the PCM.
So hang with me.
So do i need to have the key turned on to the run position to test the fuse box sockets?
Lead Driver
Joined: Oct 2003
Posts: 8,476
Likes: 37
From: Madison, WI
Depends on the circuit. Some fused circuits are dependent on the key in RUN, some are not. Off the top of my head, fuses #9 and 22 are both dependent on the key. I'd have to check the EVTM to know about the sockets for the relays. If you're going to maintain your own truck, a full set of FSMs, esp. the EVTM, is essential. Along with a multimeter and the basics of electricity.
Thread Starter
|
Fleet Mechanic
Joined: Nov 2007
Posts: 1,263
Likes: 11
From: DARTMOUTH MA
Ok
I put a multimeter to the fuses (9&22) and PCM relay
They checked out good.
Then i put the multimeter to socket #22 and that was good
But socket #9 had no power to it.
Same with the relay socket.
With key turned on
I put a multimeter to the fuses (9&22) and PCM relay
They checked out good.
Then i put the multimeter to socket #22 and that was good
But socket #9 had no power to it.
Same with the relay socket.
With key turned on
Cargo Master
Joined: Feb 2010
Posts: 2,526
Likes: 6
From: College Station, TX
Not sure if I understand what you are saying correctly but if I do then your truck will not run until forever without power running through #9. It powers all of the stuffs to do that - PCM, PCM Relay, IDM, IPR, trans something or nother etc.
Thread Starter
|
Fleet Mechanic
Joined: Nov 2007
Posts: 1,263
Likes: 11
From: DARTMOUTH MA
All three checked out good. Then i checked out the sockets that the fuses go into and fuse socket #22 checked out good.
But i checked fuse socket #9 there wasnt any power going to that socket.
So what does that tell me?
Ty for helping
Fleet Mechanic
Joined: Dec 2006
Posts: 1,925
Likes: 10
From: Phoenix, AZ
So you're saying that the socket for fuse #9 has no power when checking for voltage (did you check both pins to make sure you were on the right side? I'm not sure which side is the output side and which is the input so if you're checking with the fuse out, you should probe both pins on the fuse slot.)
If that's the case, like redman84 said, your truck will definitely not run. Fuse #9 is the power fuse for the PCM, so if it's not getting power to that fuse, your computer isn't turning on.
I don't know the wiring too well for this whole circuit, but apparently this fuse "commonly" blows because the transmission wiring harness rubs against the driveshaft/body wearing out some wires and shorting the fuse out.
Now I know you said the fuse was good so that's probably not happening in your case, but it's worth it to check that wiring harness and the front driveshaft area just to be safe.
If that's the case, like redman84 said, your truck will definitely not run. Fuse #9 is the power fuse for the PCM, so if it's not getting power to that fuse, your computer isn't turning on.
I don't know the wiring too well for this whole circuit, but apparently this fuse "commonly" blows because the transmission wiring harness rubs against the driveshaft/body wearing out some wires and shorting the fuse out.
Now I know you said the fuse was good so that's probably not happening in your case, but it's worth it to check that wiring harness and the front driveshaft area just to be safe.
Cargo Master
Joined: Feb 2010
Posts: 2,526
Likes: 6
From: College Station, TX
That is a problem if not THE problem. I don't have a schematic handy at the moment to say where to look next but I bet one of these other fellas probably already knows.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
Cargo Master
Joined: Nov 2009
Posts: 2,558
Likes: 19
I would say to jump a protected 12v to the fused side of the 9 socket and see if it fires, however you have to be 100% sure you are doing it correctly. You don't want to use an infused jumper and wreck more crap. But if it works then you need to trace the fuse 9 power wire back to the positive post on the battery.
Thread Starter
|
Fleet Mechanic
Joined: Nov 2007
Posts: 1,263
Likes: 11
From: DARTMOUTH MA
So im still not getting power to the #9 socket.
As i was taking the wires off the GPR i noticed a wire had a chafed wire.
(The wire going to my fuel bowl heater which i had disconnected months ago.
Could this be the issue?
Lead Driver
Joined: Oct 2003
Posts: 8,476
Likes: 37
From: Madison, WI
It would be an issue if it were touching a ground. Tape it off and see what happens. Follow it back to the harness; it may be chafed further up.
How exactly are you measuring for voltage at the fuse #9 socket?
How exactly are you measuring for voltage at the fuse #9 socket?
Thread Starter
|
Fleet Mechanic
Joined: Nov 2007
Posts: 1,263
Likes: 11
From: DARTMOUTH MA
This is ehat im using<br/>If theeter beeps its good<br/>If not its not. Rite?<br/>It worked for #22 and the fuses.<br/>Not sure if its the correct way thty