Obd2 scanner
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Well after all that...it would appear pin 71 on the PCM harness has no power when truck is on..don't know if I'm hitting the right pin or if my probe is getting in there to make a connection.....but no power when I tried
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Even though you may have moved on, no one answered this yet, so for the sake of clarity and for future readers, the answer is that is the power feed cable to the Intake Air Heater (IAH).
About 14-15 years ago, a popular internet vendor, who lives in sunny and warm Florida, came up with the idea to remove the intake air heater from the cold side air feed in the cast intake Y (aka "spider"). He profited from his idea by finding and selling a threaded plug to screw in the hole that the IAH formerly occupied. Eventually, he commissioned his own desing plugs to be CNC machined, and since then, many other vendors began selling plugs, some adding useful features like sending units for boost gauges.
Lot's of folks who read forums remove the intake air heater. I'm not one of them, so I can only guess that they do so under the belief that this cylindrical air heater somehow blocks air from getting to the engine. Perhaps, a previous owner of your truck held the same belief, and the result is that disconnected power wire. However, it appears that the IAH itself is visible in the top of the photo, so perhaps it was screwed back in place prior to sale, but not connected. There should also be a ground wire, and a spacer between the two.
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Thanks y2kw57..... some one did answer me about this on page 2 I think and said it was the aih connection...I would like to dig in more about this as I know really nothing about diesel motors. The aih is not something you normally find on a gas motor... when and hopefully I get this dam truck running I'll be asking more about this.
More Turbo
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If it's the AIH, it's been damaged or replaced. The AIH has a Insulator and the Nut is Captured to the on the Wire Connector.
More Turbo
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If it doesn't have power, check the PCM Relay and Base by jumping #30 and #87. The PCM should power up if you have determined for a fact the correct pin does not have power.
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Ok pirschwagon...first thank you for all your help and time. I know nothing about electoral wiring out side of installing a stereo and amp.guess I'm getting a crash course lol. I'm sure you got better things to do. You ever make to Denver beers and shine on me...
That being said. I don't know why i didn't think of the paper chip idea. Guess it's just frustration about this happen right after I bought the truck. I'll do that tonight or in the morning. I did check the PCM relay outlet and it does read 12v. Not sure how to check the relay itself but I did just buy it last night.
When you say "jumping" you mean run a piece of metal from pin 30 to 87 and then test 71 with my paper clip post��And see if it has power?
I have a PCM harness diagram you posted on page 3 of this thread but I don't know were to start counting from. The bottom left or top right.my harness sits up and down the picture is side to side. In reality I checked going both ways but I'll like to get it right when I go to count pin 30 and pin 87.
That being said. I don't know why i didn't think of the paper chip idea. Guess it's just frustration about this happen right after I bought the truck. I'll do that tonight or in the morning. I did check the PCM relay outlet and it does read 12v. Not sure how to check the relay itself but I did just buy it last night.
When you say "jumping" you mean run a piece of metal from pin 30 to 87 and then test 71 with my paper clip post��And see if it has power?
I have a PCM harness diagram you posted on page 3 of this thread but I don't know were to start counting from. The bottom left or top right.my harness sits up and down the picture is side to side. In reality I checked going both ways but I'll like to get it right when I go to count pin 30 and pin 87.
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Ok let me see if I'm understanding things
Power goes to my PCM relay from there it goes down to s123 connections. I'm told that from there it feeds the fuel pump relay and something else(don't know what it is but I guess it not important). It also feed pin 71 and pin 97 on the PCM harness. So I should be getting power to both those pins? If not I go back to the s123 connection and test the fuel relay connections for 12v power. If I get power to the relay than I have a break between the s123 connection and the PCM harness. If I don't have power to the relay than I have a bad connection at the s123 connection...
Ok...I been sitting in my truck think about this and reading and staring at diagrams...I think I might be getting this...lol
The PCM relay supplies power to the s123 connection...from there it goes to the fuel pump relay,aih,glow plug relay,and the IPR, as well as the PCM...now we know from yesterday's test that I'm getting 12v to the GPR and the AIH. Ill check tomorrow but I'm sure the fuel pump relay and IPR will both test 12v also if that's the case than my break would be between the s123 connection and the PCM harness..(see diagram on page 3)
Power goes to my PCM relay from there it goes down to s123 connections. I'm told that from there it feeds the fuel pump relay and something else(don't know what it is but I guess it not important). It also feed pin 71 and pin 97 on the PCM harness. So I should be getting power to both those pins? If not I go back to the s123 connection and test the fuel relay connections for 12v power. If I get power to the relay than I have a break between the s123 connection and the PCM harness. If I don't have power to the relay than I have a bad connection at the s123 connection...
Ok...I been sitting in my truck think about this and reading and staring at diagrams...I think I might be getting this...lol
The PCM relay supplies power to the s123 connection...from there it goes to the fuel pump relay,aih,glow plug relay,and the IPR, as well as the PCM...now we know from yesterday's test that I'm getting 12v to the GPR and the AIH. Ill check tomorrow but I'm sure the fuel pump relay and IPR will both test 12v also if that's the case than my break would be between the s123 connection and the PCM harness..(see diagram on page 3)
Logistics Pro
Joined: Apr 2011
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Your ses light most likely is due to the aih being disconnected, granted you may still have other codes that will pop up but you can clear that code by hooking it up, at least until we get your truck running
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Well after everything I been through..ripped out the wheel liner,pcm,check all relays fuses. Ripped apart the dash following wires check leads for power....
....it was the dptuner and it has to be plugged in for the truck to run...unplug it and it will not start or anything as soon as I plugged it back in.....bam wait to start light and the monster can alive...I must of accidentally unplugged it Sunday when I picked it up to take a picture for a friend. I will secure it tomorrow to prevent it from coming unplugged again.
Thanks to you guys for all the help and suggestions..I now know more about this truck than I though I'd ever know..learned a few new things too about diesel mechanics and electrical wiring.
....it was the dptuner and it has to be plugged in for the truck to run...unplug it and it will not start or anything as soon as I plugged it back in.....bam wait to start light and the monster can alive...I must of accidentally unplugged it Sunday when I picked it up to take a picture for a friend. I will secure it tomorrow to prevent it from coming unplugged again.
Thanks to you guys for all the help and suggestions..I now know more about this truck than I though I'd ever know..learned a few new things too about diesel mechanics and electrical wiring.
Hotshot
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From: Puget Sound
That's a real problem. The truck should run without anything plugged into that connector. At some point, you will need to do some troubleshooting because there is an extremely high chance your truck is not running right - and the tuner is masking the symptoms.
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Might be. I'll contact dptuner see if they have any insight as to why this has happened. I can't be the first to experience this. Everything check out on the snap-on tool. Running strong and solid. I remember now talking on the phone and picking up the controller and taking a picture to send someone...I then though this cool by I'm not going to use it unless I'm pulling or hauling heavy loads. So I plugged it with the truck running and that when the trouble started so maybe I shorted it out unplugging
Logistics Pro
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Might be. I'll contact dptuner see if they have any insight as to why this has happened. I can't be the first to experience this. Everything check out on the snap-on tool. Running strong and solid. I remember now talking on the phone and picking up the controller and taking a picture to send someone...I then though this cool by I'm not going to use it unless I'm pulling or hauling heavy loads. So I plugged it with the truck running and that when the trouble started so maybe I shorted it out unplugging
NEVER EVER ( I cannot stress this enough ) EVER unplug any electrical component like a chip, pcm, ect while the truck (or any vehicle) is running!!! Bad juju will visit you most likely and I suspect there now will be some
Hotshot
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From: Puget Sound
Ahh... good tidbit of information for troubleshooting. You broke it.
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Well still troubleshooting this..waiting to hear from dptuner. I have talk to a few people and I'm hearing diffenrt things..
Just to set the record straight I never physically unplugged the chip from the PCM all I did was unplug the controller to the chip. I wasn't sure if the chip plugged into a slot or if it was soldered to the PCM so I didn't want to go pulling around on it so I never physically disconnected the chip from the PCM just the little LCD controller.
What I'm being told is since I unplug the controller the chip doesn't know what setting to be in. So it doesn't know what to tell the PCM to do. PCM doesn't know what to do PCM won't start the engine. By plugging the controller back into the chip Its telling the chip what setting to be and it can then tell the PCM what to do.
I'm also being told that I should be able to unplug the controller without any affect on the PCM and the PCM should just revert back to its stock setting.
I have put 150 miles on the truck since getting it started and have no issues.... except now my Pyro meter doesn't work..but that's not computer related. Might've just hit or broke cord ****ing around under there.
Just to set the record straight I never physically unplugged the chip from the PCM all I did was unplug the controller to the chip. I wasn't sure if the chip plugged into a slot or if it was soldered to the PCM so I didn't want to go pulling around on it so I never physically disconnected the chip from the PCM just the little LCD controller.
What I'm being told is since I unplug the controller the chip doesn't know what setting to be in. So it doesn't know what to tell the PCM to do. PCM doesn't know what to do PCM won't start the engine. By plugging the controller back into the chip Its telling the chip what setting to be and it can then tell the PCM what to do.
I'm also being told that I should be able to unplug the controller without any affect on the PCM and the PCM should just revert back to its stock setting.
I have put 150 miles on the truck since getting it started and have no issues.... except now my Pyro meter doesn't work..but that's not computer related. Might've just hit or broke cord ****ing around under there.
Hotshot
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From: Puget Sound
Ah... that's a different thing then. Whew. Anytime something is in doubt with the truck, with the keys in your pocket - disconnect the actual chip from the PCM. This way, you are troubleshooting the truck in a known configuration, and you're not adding more connections (possible fail points) between the brains and the truck.