engine quit. no restart
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New User
Joined: Mar 2008
Posts: 14
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From: Zeeland, MI
engine quit. no restart
Got a 2000 F-450 that just died while idling the other day and hasn't restarted since. It blew the fuse for the PCM power under the hood, and took out #30 under the dash also at some point. Not sure if it was the same time. CPS is new, fluids up, etc. Not sure what to do next. Swapped out the PCM with another with no change. Thinking wiring harness issue, but any ideas would be helpful.
Thanks, Andy
Thanks, Andy
Cargo Master
Joined: Jan 2001
Posts: 2,726
Likes: 5
From: Slatington, PA
Sounds like a shorted out fuel bowl heater. Take a look at the back of the fuel filter housing. There should be a single wire (red, i think) that hooks onto a stud. Unhook that and replace the 30 amp fuse. I'm not sure what the #30 fuse is, I'll have to check that one out and get back to you.
Cargo Master
Joined: Jan 2001
Posts: 2,726
Likes: 5
From: Slatington, PA
The PCM fuse under the hood is tied to the fuel bowl heater and when that shorts out, it kills the truck. Can you give us more details? When you crank the engine, does it sound like its trying to start or is there any smoke from the tail pipe? Does the tach move while cranking? Its possible that the CPS is bad. You could try swapping it with another one.
Double check all the fuses and make sure the fuel pump is running. You should here a hum from the frame rail under the drivers seat when you turn the key to run. It goes for about 20 seconds. Hopefully this helps a bit. If not, there'll be plenty of guys that know more on here in the morning.
Double check all the fuses and make sure the fuel pump is running. You should here a hum from the frame rail under the drivers seat when you turn the key to run. It goes for about 20 seconds. Hopefully this helps a bit. If not, there'll be plenty of guys that know more on here in the morning.
Thread Starter
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New User
Joined: Mar 2008
Posts: 14
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From: Zeeland, MI
Already swapped cps...no smoke...just cranks. Tach moves a little.
The mini 30amp under the dash is connected to the fuel heater, was not aware of a connection from the one under the hood. Not on my schematic that way. I could be wrong though. Wouldn't be the first time.
Gotta go to bed...thanks.
The mini 30amp under the dash is connected to the fuel heater, was not aware of a connection from the one under the hood. Not on my schematic that way. I could be wrong though. Wouldn't be the first time.
Gotta go to bed...thanks.
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Post Fiend
Joined: Mar 2007
Posts: 26,966
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From: Texas
Double check the fuse with a test light or multi meter. Unplug the fuel bowl heater as mentioned above, replace the fuse again, and see it it starts.
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Thread Starter
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New User
Joined: Mar 2008
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From: Zeeland, MI
So...I unplugged the fuel heater. Didn't change a thing.
Problem is, the fuses aren't blowing again. If the fuel heater was shorting out, at least the one under the dash should go...
Problem is, the fuses aren't blowing again. If the fuel heater was shorting out, at least the one under the dash should go...
Thread Starter
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New User
Joined: Mar 2008
Posts: 14
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From: Zeeland, MI
The small red wire on the intake air heater relay...what's that supposed to be for?
If I put 12v to it, the truck will start. The relay toasted? and why would this relay have any effect on starting the engine?
If I put 12v to it, the truck will start. The relay toasted? and why would this relay have any effect on starting the engine?
Post Fiend
Joined: Nov 2007
Posts: 9,549
Likes: 14
From: Payson, AZ
The AIH relay works like the GPR. The wire supplys voltage to the coil so that the PCM can supply a signal to operate the relay which will supply voltage to the AIH coil to heat the intake air. By supplying battery to that terminal you are back feeding it to a circuit that is necessary for your truck to start. That voltage is not getting to that circuit in the correct way because there is an open due to a blown fuse, a relay that is not operating or a broken wire. Sorry, but without a schematic I cannot be of any more help than this. Hopefully someone with more knoledge and a schematic will chime in.
Edit: Besides relays and fuses there may also be circuit breakers to check. Circuit breakers may reset themselves or may have to be removed to reset. If they are tripped the problem causing them to trip needs to be resolved or they will trip again.
Edit: Besides relays and fuses there may also be circuit breakers to check. Circuit breakers may reset themselves or may have to be removed to reset. If they are tripped the problem causing them to trip needs to be resolved or they will trip again.
Thread Starter
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New User
Joined: Mar 2008
Posts: 14
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From: Zeeland, MI
This is getting frustrating. All the fuses and such check out, I've swapped around a bunch of stuff, and nothing. I finally got to the AIH relay after studying my schematic, but it didn't make a whole lot of sense why that would work. Must have a broken wire feeding that circuit somewhere I guess. Time to go digging.
Thanks for the input.
-Andy
Thanks for the input.
-Andy
Senior User
Joined: Sep 2004
Posts: 329
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From: Carroll County, MD
Check fusible links coming from starter relay on the fender. Since the PCM actually switches the ground side of the circuit, by applying power to the hot side of the AIH relay you are powering up another circuit as well. I know the main feed to the glow plugs and the AIH are through a fusible link, the smaller lines may be the same.
Just a thought
Just a thought
