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FREEDGUY 
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 Topic: 5.4 Codes ??
Posted: 31 Dec 2019 at 4:29pm |
Somewhat of an update to my "check engine light" question. Ended up taking the truck to a independent shop to "read" codes that weren't in the "light" perimeters. 2 codes came up, 1 being a evap canister issue( was all for that because I can only trickle fuel int the tank), the other was an ECU communication errror  .I purchased the $322 part through Rock Auto(genuine Motorcraft part) and after the install and clearing of codes and new scanner diagnostics, it's looking like an ECU issue  . Can someone tell me what an ECU is,what does it do, and is it expensive?? The independent says its a "dealer only" fix ?? The code on the scanner(Snap on) was 466 ? Thanks
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fixer1958
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Posted: 31 Dec 2019 at 6:11pm |
ECU is the 'engine control module' or computer. I can't find what 466 is. P0466 or just 466. Just 466 would be pre OBD2 which is 1995.
Checked back in the posts and it's an 05 5.4 correct?
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desertjoe
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Posted: 31 Dec 2019 at 6:16pm |
Hey Freedguy,,,I ain't very much into them fords,,,altho ole Shameless does constantly accuse me of it,,,  An ECU is a Electronic Control Unit,,same as an ECM (Electronic Control Module) and I think even some other acronyms but they all equate to the High Dollar Computor that runs the whole show in your trk,,,,!!!! I really think the Evap cannister is next to the radiator and shouldn't have anything to do with addin gas to tank,,,??? Was I you,,I would take the trk to Oreillys or Autozone and have them run THEIR OBD reader on it to see if they come up with anything other than the ECU and not quite as expensive,,!! Good Luck,,, 
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fixer1958
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Posted: 31 Dec 2019 at 6:44pm |
Joe the Evap cannister up by the radiator was pre civil war era. It's back by the fuel tank. Slow fuel fill is the tank vent is plugged for whatever reason. Regardless of where you get the 'computer' it still has to be programmed and it ain't going to get done by just a scanner...You have to buy the software and have the hardware to do it and not likely to get it at harbor freight. 
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HD6GTOM
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Posted: 31 Dec 2019 at 6:45pm |
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I just talked to my son who buys ford pickups. He had that code a year or 2 back. He found a corroded wire in a harness. Good luck with her. Dag nab persnickety females.
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steve(ill)
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Posted: 31 Dec 2019 at 8:00pm |
P0466 is not a big problem... Light on dash, but not operational... something is plugged in the gas tank vent system...that's why you cant fill the tank and that's why you get the light... can be check valve , carbon filter plugged, hose damaged, etc... Forget it... What the P0466 code meansThe EVAP system controls fumes from the fuel tank, stores them in the charcoal canister and directs them back into the engine where they can be burned like fuel. The EVAP system’s components include the gas cap, fuel lines, purge valve and charcoal canister, system pressure/flow sensors, electrical wiring/connectors, vacuum lines, fuel tank and fuel vapor hoses, among others. A code is set in the PCM when a sensor in the system sends voltage that’s outside of normal parameter |
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desertjoe
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Posted: 31 Dec 2019 at 8:21pm |
UMMmmmm,,,,me thinks I mighta missed this one,,,,, OH well,,I didn't charge anything anyway,,,,, 
"Pre civil war" ,,,Fixer,,,chit i ain't that old,,,,am I,,???
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jaybmiller
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Posted: 01 Jan 2020 at 6:37am |
1st problem....'trickle' gas in !!?? Yeesh, sounds like the plumbing is blocked or pinched. I'm trying to understand how the EVAP code comes up for them, but I'd do whatever to get gas in FAST or normal speed.....gas should flow fast and furious into the tank !
2nd problem ECU is the MAIN computer, and 'comm error' sounds like it's not 'talking ' to other computers in the truck. Newer rides have several. ECU is usually the ENGINE computer, the dashboard will have one, the 'infotainment' unit is another,security a 4th, sigh.... They all 'talk' to each other,on a 'bus'. If, IF, the diagnostice were proper, it'd say EXACTLY who isn't talkin to whom.... If you've wiggled or removed ANYTHING, unplug and reconnect 2-3 times, be SURE locking clips are locked.Also look for pins NOT properly seated in the connectors.
I KNOW that if you're a contractor and wire up your high powered stereo you can blow up the dash computer($$$$) and fry a lot of wires under the dash.....
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Ted J
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Posted: 01 Jan 2020 at 9:19am |
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"Allis-Express"
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steve(ill)
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Posted: 01 Jan 2020 at 9:22am |
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why do you think you need a new ECU ? Exactly what is the truck doing and what is the code you get ? The truck is RUNNING if you are getting codes ? Anything related to the gas tank fill / vent system is not part of the ECU, if in fact you have a problem.
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Like them all, but love the "B"s.
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Red Bank
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Posted: 01 Jan 2020 at 10:39am |
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Disconnect batteries for two hours. Hook back up and drive it a couple of days and get the shop to recheck the codes.
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FREEDGUY
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Posted: 01 Jan 2020 at 4:18pm |
 fixer1958 wrote:
ECU is the 'engine control module' or computer. I can't find what 466 is. P0466 or just 466. Just 466 would be pre OBD2 which is 1995.
Checked back in the posts and it's an 05 5.4 correct?
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Correct, 5.4. yes, PO466 is the code that came up on the scan tool. Said EVAP can/solonoid,ECU error/fail to set light. 2005 model year truck.
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FREEDGUY
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Posted: 01 Jan 2020 at 4:29pm |
steve(ill) wrote:
P0466 is not a big problem... Light on dash, but not operational... something is plugged in the gas tank vent system...that's why you cant fill the tank and that's why you get the light... can be check valve , carbon filter plugged, hose damaged, etc... Forget it... What the P0466 code meansThe EVAP system controls fumes from the fuel tank, stores them in the charcoal canister and directs them back into the engine where they can be burned like fuel. The EVAP system’s components include the gas cap, fuel lines, purge valve and charcoal canister, system pressure/flow sensors, electrical wiring/connectors, vacuum lines, fuel tank and fuel vapor hoses, among others. A code is set in the PCM when a sensor in the system sends voltage that’s outside of normal parameter |
The problem is, the light DOESN'T come on (it works because it lights up on the key cycle). This is a code that was "sniffed out" by a diagnostic scan to look for an intermittent cylinder drop in O/D. The $327 canister was replaced yesterday morning and I can attest that there is NO more filling restriction in the tank . Stiil came back with the PO466 code after replacement/code clearing . Only option according to the mechanic was an ECM ? Thanks,you certainly know what is going on with my particular vehicle and I GREATLY appreciate you and ALL of the other replies !!
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FREEDGUY
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Posted: 01 Jan 2020 at 4:36pm |
steve(ill) wrote:
why do you think you need a new ECU ? Exactly what is the truck doing and what is the code you get ? The truck is RUNNING if you are getting codes ? Anything related to the gas tank fill / vent system is not part of the ECU, if in fact you have a problem. |
That is what came up on the mechanics code reader,there are 2 seperate sources for this code,1 being the evap canister, the other being the ECM, both under the same "address".Yes truck runs, but chasing an elusive cylinder drop  . The canister was replaced yesterday yet the code still returns after being cleared by the scan tool.
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steve(ill)
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Posted: 01 Jan 2020 at 4:50pm |
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I would forget about the ECM and not replace. The truck STARTS so the ECM is talking... If you have a miss fire, then you need to look at the plugs, coils , coil boot , electrical plug onto the coil, electrical plug onto the fuel injector and possibly the injector... If you have no FUEL codes, I would concentrate on the plugs and coils..... codes will eventually show up when bad enough... If someone has a REAL GOOD code reader, they can see electrical miss fires for each cylinder REAL TIME.. I think its called Mode 6 or Mode 8.
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steve(ill)
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Posted: 01 Jan 2020 at 4:52pm |
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The charcoal canister was PLUGGED and not letting the vent BREATH and that stopped the filling of the tank... Now that that is fixed, you have a MINOR problem with a hose, check valve or gas cap that is continuing to give "the code".... but its not a RUNNING problem.
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Like them all, but love the "B"s.
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FREEDGUY
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Posted: 01 Jan 2020 at 5:24pm |
fixer1958 wrote:
Joe the Evap cannister up by the radiator was pre civil war era. It's back by the fuel tank. Slow fuel fill is the tank vent is plugged for whatever reason. Regardless of where you get the 'computer' it still has to be programmed and it ain't going to get done by just a scanner...You have to buy the software and have the hardware to do it and not likely to get it at harbor freight. |
Mine is above the spare tire, 3' long,8" around, runs width wise under the bed
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Red Bank
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Posted: 01 Jan 2020 at 5:42pm |
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I have the same truck you have and I was chasing a skip. I ended up changing the spark plugs and two ignition coils. I need to change the evap canister because of slow fuel fill ups. If you can find an independent shop that has the Ford IDS laptop they can pinpoint the misfire cylinder and reset the KAM which is keep alive memory which is what disconnecting the battery would do which is why I recommended it. The ecm will go through a relearn when you reset the KAM. Sometimes that’s the only way to clear the codes.
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FREEDGUY
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Posted: 01 Jan 2020 at 5:51pm |
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I will definitley take the time to unhook the battery. The plugs and boots were changed a month ago (plugs were shot at 160,00;I bought it with 120,000),pretty sure they had been changed though. The rear D/S coil had been replaced at some time because it has different #'s on it at a smaller "peg" that holds the boot spring,had to "pinch" the spring to make it stay on the peg to install back into the hole.
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Red Bank
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Posted: 01 Jan 2020 at 5:55pm |
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I had forgot you had changed the plugs. I have the Ford IDS and like everything else I wished you were close by I would check it for you lol. Did you install the motorcraft or the champion plugs?
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FREEDGUY
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Posted: 01 Jan 2020 at 6:02pm |
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MOTORCRAFT everything, even the canister (Rock Auto).
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LouSWPA
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Posted: 01 Jan 2020 at 10:25pm |
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Did the cylinder drop issue start before or after the plugs were changed? I can tell from experience what Steve and Red are telling you is good advice, forget the 466 for now, that is not likely your cylinder drop issue. The coils, and/or the plug boots are notorious for nagging 'miss' issues. I really, really doubt your problem is the control module. also, as Steve says, could be an injector.
Clear the system like Red says, and then have a Ford dealer scan it. Ya, you will have to pay him, for the scan, but you are not required to have him do the repair.
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jaybmiller
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Posted: 02 Jan 2020 at 6:05am |
It is highly unlikely to be the ECM. They are built tough and frankly, NOT prone to 'random' partial failures. Dang thng would be $$$$$$ from Ford ! If you're truly convinced it's 'bad', goto wreckers and get one from the SAME year/model/drivetrain.Guy next door 'parts out' pickups,usually sells engine AND ECM as a package,but again ultra rare to have an ECM 'paritally fail'. Electronics generally dies, not OK, not, ok, ok, not.... If you know which cylinder, swap the parts with another,see where the next fault comes from. If the opriginal cylinder, swapped part is OK, so swap another, retest...
I hear about bad coil packs, new ones ! Could vene be a bad plug, yeah I know 'new' BUT that doesn't mean 'defective'. I'd also unplug, grease, connect EVERY pair of connectors 'under the hood'. My 77 F100 had the nasty, random habit of dieing..fun on the highway. Replaced 'everything under the hood' ONLY to discover one pin in a firewall connector wasn't properly seated........
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bobkyllo
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Posted: 05 Jan 2020 at 6:26pm |
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Do not unplug all the connectors just to grease them. You very possibly could create more troubles then you have already.
You need to find a guy that has a scan tool with the ability to watch for miss fires or cylinder contribution problems.
Another thought that comes to mind is a bad injector. You might do an injector balance test hook up a fuel pressure guage and then one by one fire each injector. When you do this record the pressure before and after you fire each injector.
If that leads you to no good answer then the next thing is to watch some live data with the vehicle running. Is one bank running rich versus the other. That will all be found through the long and short term fuel trims. It's possible that you. Have a bad intake gasket. That would cause pirate air to get into the motor. That air was not accounted for by the vehicle and the computer will try and correct for it. The tool you'll need there is either a propane bottle and blow some propane around the intake and see if your motor responds to it. Another way is with a smoke machine.
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TimNearFortWorth
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Posted: 05 Jan 2020 at 6:39pm |
As a wrench buddy of mine says that owns his own shop; any codes coming up on a 5.4 should all just say"you are screwed" . . . . Have yet to hear much good about that engine used in trucks.
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