External fuel pump
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Senior User
Joined: Apr 2012
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Thanks for offering assistance. The internal pump is working fine.
All this is normal. Are you sure your in tank pump is not running? There is a possibility that you simply have a failed pump. If you apply 12 VDC to the pink/black(+) and orange(-) terminals, the pump should run and deliver low pressure fuel(around 6 psi) to the frame mounted high pressure fuel pump.
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The diode is gone. I've checked all the way back to the rubber grommet.
Since it's job is simply to prevent current from going in both directions, does it matter what size diode I use?
Since it's job is simply to prevent current from going in both directions, does it matter what size diode I use?
Fleet Mechanic
Joined: Mar 2014
Posts: 1,926
Likes: 116
From: Saskatchewan Canada
And I already gave you an idea as to what would work should you decide you must replace this.
I know you are struggling with this and chasing electrical issues can be a very trying chore for those who are not comfortable with it, but you seem to be circling and guessing and I can tell you right now that chasing this perceived diode issue will not resolve your inability to read codes. There is a lot going on in this thread, 287 posts and counting and you just acknowledged post 151?
Cargo Master
Joined: Jun 2013
Posts: 3,176
Likes: 15
From: Somewhere n North America
You must have had this harness fairly disconnected when your engine was rebuilt.
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I'd say you have a lot of nerve questioning what I indicated. I, in fact, did trace the wiring all the way back to the rubber grommet that attaches to the fire wall.
That was NOT hard to do since the entire set of wires runs clear and easy to reach on the drivers side of the engine. I'm not sure why you'd find that hard to believe. The diode is NOT there.
With regard to the particular diode that you indicated will help, I had missed that when I read your post, but see now that you recommended a 1N4005 and/or 1A and over 50 PIV should work. Thanks for the recommendation.
[QUOTE=NotEnoughTrucks2014;16427168]I find that very unlikely and what would this grommet reference? I suggest you reread my prior post.
That was NOT hard to do since the entire set of wires runs clear and easy to reach on the drivers side of the engine. I'm not sure why you'd find that hard to believe. The diode is NOT there.
With regard to the particular diode that you indicated will help, I had missed that when I read your post, but see now that you recommended a 1N4005 and/or 1A and over 50 PIV should work. Thanks for the recommendation.
[QUOTE=NotEnoughTrucks2014;16427168]I find that very unlikely and what would this grommet reference? I suggest you reread my prior post.
FTE Legend
Joined: Jul 2010
Posts: 32,875
Likes: 48
From: Northeast, OK
Sqauvry- I don't have my knickers in a twist, or however you said it. I'm trying to be be real. You already volunteered that you are "actually disabled due to a multitude of physical factors that precipitates some serious memory loss, ability to concentrate, etc.". Given that, I think you need to slow down and concentrate on one thing at a time. Let the guys give you advice, heed all of what they say, and after getting all of the ideas on the table then, and only then, do something.
For instance, they are telling you that the diode is buried and you will only be able to tell if it is there/good by using your DVM. But you go looking for it visually.
Further, they are telling you it isn't likely the diode is preventing you from getting codes. In fact, the way you are trying to read the codes is suspect.
So, I think you need to focus on one thing at a time. Get consensus as to what needs to be tested and how, and do that - and only that. Report back and then get consensus as to what to do next.
For instance, they are telling you that the diode is buried and you will only be able to tell if it is there/good by using your DVM. But you go looking for it visually.
Further, they are telling you it isn't likely the diode is preventing you from getting codes. In fact, the way you are trying to read the codes is suspect.
So, I think you need to focus on one thing at a time. Get consensus as to what needs to be tested and how, and do that - and only that. Report back and then get consensus as to what to do next.
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Hi Vince -
I do not know how it went missing. I think it wasn't there when I bought the truck back in 2009. Nonetheless, I am moving forward, or trying to, and will replace the diode with something akin to what NotEnoughTrucks2014 recommended.
I traced back the wires to the ECM connector - wires 36 and 21. As I understand it, one of those wires runs directly to one side of IAC connector, and the other one connects to the diode along with another wire that runs directly to the other connection on the IAC connector.
In the meantime, I disconnected and covered the one wire that runs to the missing diode; that wire was connected together with the other wire running from the computer and shouldn't have been.
I do not know how it went missing. I think it wasn't there when I bought the truck back in 2009. Nonetheless, I am moving forward, or trying to, and will replace the diode with something akin to what NotEnoughTrucks2014 recommended.
I traced back the wires to the ECM connector - wires 36 and 21. As I understand it, one of those wires runs directly to one side of IAC connector, and the other one connects to the diode along with another wire that runs directly to the other connection on the IAC connector.
In the meantime, I disconnected and covered the one wire that runs to the missing diode; that wire was connected together with the other wire running from the computer and shouldn't have been.
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Gary- I appreciate your post and I apologize if I seem to not appreciate the help I am receiving. I do. But I must say that I don't understand a lot of what is being said. As an example, what does it mean to find the diode using my DVM? I haven't a clue as to what you are talking about.
You guys have a ton a knowledge that comes second nature to you and you can converse with each other and each can nod with understanding. I am not a trained mechanic and am doing all of this for the first time in my life. My learning curve is enormous and I am reading posts and ingesting as much as I can. But half of the time, I have no clue about what anyone is saying.
Some, like Vincent and ctubutis have taken time to walk me through step by step and for that I am grateful. But others aren't as clear in their explanations and I am having trouble wading through it all.
Still, I will slow down and try harder to put together that wealth of information shared.
Steve
You guys have a ton a knowledge that comes second nature to you and you can converse with each other and each can nod with understanding. I am not a trained mechanic and am doing all of this for the first time in my life. My learning curve is enormous and I am reading posts and ingesting as much as I can. But half of the time, I have no clue about what anyone is saying.
Some, like Vincent and ctubutis have taken time to walk me through step by step and for that I am grateful. But others aren't as clear in their explanations and I am having trouble wading through it all.
Still, I will slow down and try harder to put together that wealth of information shared.
Steve
Sqauvry- I don't have my knickers in a twist, or however you said it. I'm trying to be be real. You already volunteered that you are "actually disabled due to a multitude of physical factors that precipitates some serious memory loss, ability to concentrate, etc.". Given that, I think you need to slow down and concentrate on one thing at a time. Let the guys give you advice, heed all of what they say, and after getting all of the ideas on the table then, and only then, do something.
For instance, they are telling you that the diode is buried and you will only be able to tell if it is there/good by using your DVM. But you go looking for it visually.
Further, they are telling you it isn't likely the diode is preventing you from getting codes. In fact, the way you are trying to read the codes is suspect.
So, I think you need to focus on one thing at a time. Get consensus as to what needs to be tested and how, and do that - and only that. Report back and then get consensus as to what to do next.
For instance, they are telling you that the diode is buried and you will only be able to tell if it is there/good by using your DVM. But you go looking for it visually.
Further, they are telling you it isn't likely the diode is preventing you from getting codes. In fact, the way you are trying to read the codes is suspect.
So, I think you need to focus on one thing at a time. Get consensus as to what needs to be tested and how, and do that - and only that. Report back and then get consensus as to what to do next.
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Cargo Master
Joined: Jun 2013
Posts: 3,176
Likes: 15
From: Somewhere n North America
Hopefully you have a Radio Shack or Radio Parts supply company close to you where you can find a diode, definitely get that fixed, and put the diode in in the right direction electrically. (We can cover that when you get the diode)
Last edited by vjsimone; Jul 16, 2016 at 09:29 AM. Reason: Adding text
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Senior User
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Radio Shack is closed. But I'll find a diode in the range recommended. I am sorry if I appear to be a knucklehead. I don't understand this stuff so well.
Cargo Master
Joined: Jun 2013
Posts: 3,176
Likes: 15
From: Somewhere n North America
"Put the diode in in the right direction electrically." (We can cover that when you get the diode)
FTE Legend
Joined: Jul 2010
Posts: 32,875
Likes: 48
From: Northeast, OK
You could possibly detect if that diode is there by unplugging the IAC and the ECM and using the diode check function on your multimeter across the red and grey/white wires at the IAC. Should be able to read that diode across there without any interference from other circuitry.
Like Chris says, probably have not unwrapped the harness enough to find it. Very unlikely it's not there. If it does have to be replaced, something simple like a 1N4005 would work. Anything 1A and over 50 PIV should work.
Like Chris says, probably have not unwrapped the harness enough to find it. Very unlikely it's not there. If it does have to be replaced, something simple like a 1N4005 would work. Anything 1A and over 50 PIV should work.
Methanoholic
Joined: Mar 2009
Posts: 6,442
Likes: 8
From: Maine (NorCal Native)
Gary- I appreciate your post and I apologize if I seem to not appreciate the help I am receiving. I do. But I must say that I don't understand a lot of what is being said. As an example, what does it mean to find the diode using my DVM? I haven't a clue as to what you are talking about.
You guys have a ton a knowledge that comes second nature to you and you can converse with each other and each can nod with understanding. I am not a trained mechanic and am doing all of this for the first time in my life. My learning curve is enormous and I am reading posts and ingesting as much as I can. But half of the time, I have no clue about what anyone is saying.
Some, like Vincent and ctubutis have taken time to walk me through step by step and for that I am grateful. But others aren't as clear in their explanations and I am having trouble wading through it all.
Still, I will slow down and try harder to put together that wealth of information shared.
Steve
You guys have a ton a knowledge that comes second nature to you and you can converse with each other and each can nod with understanding. I am not a trained mechanic and am doing all of this for the first time in my life. My learning curve is enormous and I am reading posts and ingesting as much as I can. But half of the time, I have no clue about what anyone is saying.
Some, like Vincent and ctubutis have taken time to walk me through step by step and for that I am grateful. But others aren't as clear in their explanations and I am having trouble wading through it all.
Still, I will slow down and try harder to put together that wealth of information shared.
Steve
When these folks say something you do not understand ... STOP, Ask, They will GLADLY explain, They are here because they do know and like not only to pass their knowledge on but help people just like you!
Remember, The only dumb question is the unasked one!
A dumb question to some, is a smart question to others!
Steve, This is a long help thread, it has lots of overwhelming info even for some that have been fixing stuff all their life ... So don't count yourself out, you're hanging in there pretty darn good!
-Enjoy
fh : )_~