Stuck Open Fuel Injector (how to fix)

2001 Dodge Grand Caravan 3.3 with a #5 injector control wire shorted to ground.
This is a common issue on the Caravan and Town and Country models. The wire harness right above the exhaust crossover pipe will melt together and cause multiple problems. MAP sensor codes, injector codes, TPS and IAT codes etc. This problem can also damage the computer ground circuit as well as any other sensors on the 5v reference circuit. (Injector control voltage will spike into the sensor ground circuit of the computer).
Symptoms:
- P0205 trouble code (Injector 5 control circuit fires improperly)
- hard staring (long crank time)
- start/stall
- excessive fuel consumption
- poor gas mileage
- white smoke from tailpipe
- fuel odor
- low power
- misfire
Fix:
- repair melted computer harness connector near exhaust manifold crossover pipe (common problem)
Testing methods shown:
- how to test a fuel injector
- how to test for a short to ground on a fuel injector
- how to test for injector control
Related videos:
- How to test a fuel injector circuit with basic tools
• How to test a fuel inj...
- Fuel injector failing when hot (fixed with snow)
• Lexus fuel injector fa...
- How to test a fuel injector (open winding case study)
• How to test a fuel inj...
- Stuck Closed Fuel Injector (how to fix)
• Misfire from a stickin...
Playlist:
- (Chapters 17, 18 and 19) Fuel Injector Testing
• (Chapters 17, 18 and 1...
For more information on this topic, I have written a “field manual” called Engine Performance Diagnostics which is available at www.scannerdanner.com as an eBook or paper book.
Want even more diagnostic training? Whether you are a DIY trying to fix your own car, someone looking to become an auto technician, or a current auto technician that wants to get more into diagnostics, subscribe to ScannerDanner Premium www.scannerdan... There is a 14 day free trial.
On ScannerDanner Premium I will bring you right into my classroom at Rosedale Technical College. You will find page for page lectures taken right from my book as well as exclusive classroom type case studies. What is so special about these classroom case studies? I pull live problem vehicles directly into my classroom and we troubleshoot them in real time, using and applying the theory and testing procedures we learn during the classroom lectures. There is no better on-line training of how to troubleshoot automotive electrical and electronics systems anywhere!
Disclaimer:
Due to factors beyond the control of ScannerDanner LLC, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. ScannerDanner LLC assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. ScannerDanner LLC recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of ScannerDanner LLC, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not ScannerDanner LLC.

[@thewibb]

Just found your page today while troubleshooting some things on my 04' Cavalier. Just wanted to say that your work is impressive. You are very thorough and obviously know your stuff. I wish more people were willing to share their knowledge as you do, we'd all be better off. Impressive!

[@VonBraun87545]

You have a very logical and simplistic approach about how you analyze and explain an electrical problem so that everyone can easily understand your explanation. You are a very good teacher. Two thumbs up!

[@theloosemoose8200]

It would be nice if all mechanics took the time to educate themselves like this. most mechanics don't know 1/2 of the stuff on your channel...

[@BassRocket]

Thankfully this gentleman takes the time to provide some good info for the technicians who care to understand how to test multiple diagnostic procedures. Learning basic fundamentals of electrical systems is important if you want to build a process of diagnosis.

[@todpatn9782]

I just wish I could just a smidlit

[@photondebuger45]

I went to school for this too and went for 5 years and yeah it’s funny when you tell them that they as in people hound you to help them only to tell you I don’t think that’s it and you do what they want doesn’t fix the car and you shoe them the problem and are just like oh….. oh what??? You wasted my time and effort and I was right and you weren’t, get the hell of my property and don’t call me again for your car problems. And or you have the ones like you are saying that know nothing and tell you if you spent years learning it that anybody can do it but not do it themselves like ok… do it then 😂😂 some logic on peoples on mechanics is ass backwards. But yeah there are some that are truly bad and crooked that’s true but some aren’t tho. I’m here trying to really see if a car I’m working on if it’s pcm really went bad on an injector because I refuse to believe that…. Even tho I have the wire intact and the injector actually does work but no signal…. I still refuse…

[@werksalot]

Hi Scanner Danner , I'm new to your channel . I watched this video because I have a 2002 pt cruiser with a p0304 and a p0204 code . I tried swapping injectors and I cleaned the spark plug for cylinder #4 . Cleared the code and the p0204 came back but not the misfire code . After watching your video I tried the procedures you used and it worked great . I found 4 wires in the main harness going to the PCM that were bare . Two of which looked like someone had stripped the wire off of them . But the wire from injector #4 looked worn from rubbing together in the harness which had a lot of oil residue in it . This section runs over the top of the Transmission housing right where it mates to the Engine , so it probably gets a lot of heat . So I said all of that to say thank you for your instructional videos . Car is running like it should now . Thanks again . I Will be watching .

[@tooljunkie555]

Thts a good mechanic. Wish all mechanic is were good like that

[@LayZeeDawg]

The replacement harness is part number 4868408AC and is slightly less than $200.00. (WIRING FUEL RAIL) There is also repair kit for this item for less than 35.00 part number 5017114AA with the connector that goes behind the PS reservoir and either crimps or can be soldered into the harness.

[@watlinsd]

Mr. Danner, you have some lucky students receiving this level of instruction. Your videos prompted me to get a scope for the 10% of the issues I can't figure out with other methods (I cheaped out and got a Pico 2205A, can't justify the cost of their cool automotive versions, but the 2205A works great with attenuators). My car is working fine now, so I am gathering all sorts of wave forms now to save in my "good" library. I have learned that my injector voltage wave forms looks way different than what I normally see in your videos, but I think that is a function of my car being GDI. Either way, it is interesting when I get similar results to what I see in your videos or when I do come across differences. As we used to say at the dealership, "Fix It Right the First Time". By the way, you need to make some sort of "Zener Dump" t-shirt to sell on your website in addition to your book.

[@ScannerDanner]

+S Dub lol on the Zener Dump idea. I am working on some merchandise. Anyway, yes, the GDI will look very different! I don't have anything on this channel on GDI yet but I do on my Premium channel. It was a 2 or 3 part series I did with my class on testing these systems with a scope. There is a 14 day free trial if you want to check it out. Thanks!

[@joemondalto8089]

Hi Scanner Danner, I have a 98 infiniti q45 4.1 V-8 Had issues with two injectors and two coils at different time over a months period that were causing misfires. Changed them out and that fixed the problem. Driving home one day i notice a incredible amount white of smoke coming out of the exhaust and felt a misfire. My sons friend suppose to be a mechanic, so we purchase 8 new coils and 8 rebuilt injectors online which were installed along with new spark plugs and map sensor. Problem with white smoke still the same. Happen to check the oil dip stick and found it to be over fill with a strong gas smell and 2 .5 gallons of mixed oil and gas when i changed the oil plus almost 8oz. of gas at the air filter canister . Changed the oil and filter,wiped out the gas at air filter area, started back up to trouble shoot but could not run for long ,afraid neighbors might call the fire department because of the smoke. Try a couple more times two weeks later and the same thing 3 gallons of mix oil and gas and constant flooding of gas at the air filter canister. Thought maybe the fuel regulator vacuum hose might be sucking gas back into the intake?. Removed hose and it look dry to me. Just cranking the engine floods out the air filter canister. Whats next. Thanks Joe

[@remodz6385]

I also had this same exact problem on my 01' grand caravan 3.3 a couple summers ago. Wife left for 5 mins, came back and said the car was smoking a bit, she parked it in the driveway and I could see the smoke trail from where she came all the way down the street! Pulled a code, and it said "injector 5 open/grounded circuit." It was a Sunday, and I needed to get it back up and going. when I found that harness melted, I knew I would be sitting down for the next hour or two replacing about 12" of harness. It wasn't fun. Rerouted the repaired harness and it's still holding up 2 years later. Very very common on these, the harness literally sits on the exhaust heat shield.

[@ksauto1]

I mean put the test light to power and then check the computer to see if it was trying to control the ground. It would really suck to do the job of replacing the wire, getting everything done, then having to go back and tell the customer the computer was also fried, or worse yet, shorted out the new wiring. Again thanks for all your great info!

[@russbroka2919]

Appreciate the great video. My wife drives the exact same car. It started running rough and was giving a P0204 code. I found your video and started looking into the problem. I found the injector wiring harness fried almost exactly like in the video. I pulled the harness off, separated the wires and band-aided it with electrical tape. I checked continuity on the harness to make sure no wires were touching. I re-installed harness and switched injector #4 with the one next to it. Fired up the car and was still getting P0204 code. I then pulled the pin on the connector to the PCM for the #4 injector, plugged it back in to the PCM, fired up the engine and got 13 volts to ground on my multimeter. I then swapped the leads and read from battery + to the control wire pin and got 0. If I was understanding everything correctly on the video this would mean the Injector driver in the PCM is faulty? Is there anything else I should check prior to condemning the PCM? Thanks again!

[@Mark33090]

Great video. I am amazed that it ran at all with the harness in that condition...

[@genek3961]

You helped me with the Chrysler Town and Country I'm working on. Harness was bad also and it shorted out #2 fuel injector driver. I did the test like you stated and when engine was running there was no ground in the wire side and light would go out. When I back probed the opening where I removed the wire for the injector there was 0 volts coming from that driver and vehicle voltage from the other injectors.

[@MrZeddy100]

Wow mate that's exactly what has happened to my voyager, mine was injector 6. Great pickup, now I gotta fix it!

[@buckyflex1]

I NEVER leave comments on vids but i had to this time to give u props man this is a perfect example of how to do an instructional video. any DIYer knows how priceless finding the right forum thread post or youtube vid can be when ur up shitz Creek n how much time is waisted sifting thru crap before u find something useful so thank you man. you got right down to biz, you were through but kept it moving at a nice pace, and most of all u were strictly biz no needless yappin. nothing pisses me off more than when I'm in the middle of a project and get in a jam n i click on a vid hoping to get the info I need n the guy spends the 1st half of the vid givin his life stroy or babbling about his new camera or y he's in the driveway instead of the garage or whatever no1 gives a shit just get on with it! thanks again man n keep up the good work!

[@ScannerDanner]

+buckyflex1 haha I may be guilty of that is some of my other videos, but thanks so much for your comment. It means a lot

[@ScannerDanner]

Still a good reminder 6 years later. Thanks!

[@JeffTheFlashlight]

this video is exactly what happened to my wife's van. Except her harness is not as bad. I'm just gonna shrink tube it up. Thanks for you excellent video.

[@superdave3438]

2006 Ford Ranger , 2.3 engine. With key off engine off, # 4 cylinder filling with fuel and emtying entire fuel tank. Pulled codes, P0232. Started diagnosis by pulling wiring schematics and readinf description and operation and code description. I attacked inertia switch. Found someone pulled inertia switch and twisted wires together and the skinned green wire with yellow stripe, they ran jumper wire . I bought new inertia switch and connector from Ford. installed and it fixed P0232 code. Pulled codes after running engine and got code for O-2 sensor. Noticed very oily around o2 sensor. Pulled and replaced sensor vert oily and fouled. Replacing o2 sensor fixede that code. Still have #4 cylinder filling with fuel. When start same smoke seen in this scanner Danner you tube. This mor5ningt day after Christmas I will drive back to my friends shop. and use this KZbin. Hopefully today I solve the saga. Thank you Scanner Danner. I am retired college instructor and Master Tech but tired being sick. Have to get out and exercise My brain. I say thank you Paul Danner for inspiring me to not just roll over and die but get back in game. Helpiong friends with shops. PS been in many conferences with you before I had to retire because of cancer. Hope to visit you again. SuperDave.

[@billrimmer5596]

Was able to fix an 01 Caravan 3.3 with hard start/no start issues when hot. Using the Vantage Pro and all the information learned on this channel and the Premium channel. The injector harness was all melted together. Separated and taped wires and problem solved. The injector drivers and computer still good. Thank u Paul!!

[@ScannerDanner]

+Bill Rimmer awesome Bill! Thanks so much!

[@shawnakirsch4536]

Repaired upper wiring harness. Still having the same #1 open circuit. not pcm! guess ill check lower wiring harness.

[@BillB]

I wish I could find a mechanic like this guy.

[@ScannerDanner]

Thanks man. Keep watching, my content had always been good, just now starting to get better at editing and shooting video :)

[@sundayzakhele6974]

Hi my kia rio got 1 and 2 injector wire a not working

[@dxta7360]

Nice video. I have an Infiniti V8 I have being battling with since last week. Engine was misfiring, with gasoline smell in the cabin, and exhaust pipe. Although the smoke was not white here, but black. I have replaced all ignition coils, it works awhile, but no progress. I have gotten the electrical wiring diagram of the car which I'm following holistically. I have done the following: 1. Voltage tests on the fuel injector power red wire harnesses to the injectors. I have battery voltage( this happens only with the injector connectors unplugged from the injectors. But immediately all injector connectors were connected, I realised that all the ground wires on the injectors were also having battery power, which is not supposed to be so. I suspect there's a short to power or ground somewhere on the Injector circuits. Even with the ECU unplugged, and ignition turned ON, both positive and ground wires on the injectors were showing battery voltages. But immediately I disconnect all injector connectors from the injectors, everything returns to normalcy. I suspect there's some kind of short to power or so on the chassis? Could you helped pls?

[@ScannerDanner]

@ScannerDanner Ok just rechecked diagram. The ASD powers the Ignition coil, Alternator field, Injectors and Uptream and Downstream O2 heaters. All of these circuit are ground side controlled by the computer EXCEPT the downstream O2 heater. It has a direct ground to the block. So if you want to do the injector control wire test like I did in the video with the engine not running (no power on ASD circuit) you would have to unplug the downstream O2 sensor to eliminate the back feed. make sense?

[@todpatn9782]

I wish I just had a smidjit of what he knows. But I do know to watch and listen to him.

[@careyautorepairs]

Who needs a spanner when you got Scanner Danner. Love your videos Paul.

[@tonydiaz1224]

My respect to you excellent explanation very professional full skilled. that was exactly the problem that I had .

[@ford3809]

Never knew white smoke could be a stuck injector. Awsome information, extremely informative. I got something to do on my car now.

[@spreplayz]

Because it's not,this guy is full of it.

[@ford3809]

@@spreplayz that caused white smoke on my car, changed that injector and no smoke.

[@Kevin_Yagoonie]

​@@ford3809how did you know what injector to change? My trucks blowing a bunch of white smoke and has a jumping idle

[@ford3809]

@@Kevin_Yagoonie get a long screwdriver, put the tip on the injector and put the other end to your ear. You should hear constant clicking clearly. All them should click at the same rate assuming the engine rpm is constant. If one is not clicking, or clicking erratically, that's your problem.

[@ford3809]

@@Kevin_Yagoonie mine was not clicking cause it got clogged. My tank was full of debris, that was the cause of the original problem.

[@ScannerDanner]

@frosty9595 your not bothering me at all! You are forgetting that this ASD relay powers multiple circuits in parallel. It is not just for the injectors, this is where the backfeed will come from. It will travel through the O2 heater directly to ground or through the fuel pump or Alternator field winding....I need to double check the diagram to answer for sure

[@sporktek]

I'm getting a p0201 (injector control open or shorted to number 1) - stated with sudden onset rough running but no codes. I had a leaky fuel rail so I pulled the plenum and replaced the fuel rail and did the plugs and wires. Plugs were real bad so I thought I had it. Replaced the injector o rings and the plenum seals too. Reassembled- running rough still and now throwing p0201. Tested and found continuity to ground at the injector connector. Disconnected upper PCM connector, still have continuity to ground. Tested at cavity 13 in PCM connector, with injector unplugged, continuity to ground there too (expected - just the other end of the wire, after all). Inspected the injector harness, really bad melted. Repaired by carefully separating each intact conductor and taping. No shorts now in this harness. Reassembled to vehicle and road test, still rough running. Still showing continuity to ground at injector and at PCM #13. Disconnected injector harness. No longer showing continuity to ground at injector connector. Still showing continuity to ground at cavity 13 on the PCM connector. Showing continuity to ground on two blades (unknown numbers, can't find a diagram) in the engine harness side of the injector harness connector. One blade is in the corner of the connector, the other showing ground continuity is up and over one space. I disconnected the coil pack supply connector and the water temperature sensor connector, cut the zip tie securing the harness and fished it out under the cross over pipe and brought the whole end of that branch of the harness up between the crossover pipe and the battery for easier access. I stripped the tape and other shielding from the harness down almost all the way to the main branch of the harness on the transaxle bell housing and found no evidence of melted, worn or wires otherwise shorted together or to the engine/chassis in this span. I gave all the bundles significant tugs and wiggles and noted no change in continuity to ground. So, to recap, getting continuity to ground, PCM plug is disconnected, two blades (corner and one up and over) in the injector/map harness connector on the engine harness side, and of course from the PCM connector cavity 13 to ground. Would I be correct in assuming that there must be a short in the engine harness where it runs over the top of the bell housing? The loom there appears to be intact and shows no outward signs of internal melting. Does the injector driver wires take the shortest possible path when in the main harness? That is, do the wires just go directly down to the bell housing, them come back up at the branch without going down toward the starter and oil pressure sensor? Also. This may be of help: this car has a leaky oil pressure sending unit and it has soaked up through the harness and is coming out in the PCM connector a little. I have heard of this happening. Could engine oil contribute to insulation failure in a harness and cause a short circuit? Also, this vehicle has an ATF leak which currently soaks the lower portion of the harness below the PCM. This looks to be below the place where the injector/map/coolant temp/coil branch departs, but fluid can migrate also.

[@sporktek]

Ended up being damaged PCM. Injector driver circuit burned out due to shorted harness. I opened the PCM up, discovered an area of darkened/smoke infiltrated potting gel near the external connector, I cleared the potting gel from this area and discovered one transistor in a cluster of six (presumably output transistors for the injector drive) was badly burned, split open and causing charring/discoloration of the nearby gel. Replaced the PCM with a salvage unit, normal engine operation resumes. I plan on trying to repair the PCM if I can get the board out of the casing. The potting gel is a real pain in the ass though so I doubt I'll invest much effort into it. The salvage replacement cost me $45.

[@digging6068]

This could be a problem I have with a 92 model efi302 in a f150. It has set for 15 years because no local mechanics could diagnose the problem with it. Rough idle, running very rich, and the last time I drove it , it went through 16 gallons of gas in 75 miles! We have been considering a bad brake booster, and you can hear the brake booster sucking air, but further research has showed that the diaphragm in the brake booster will go bad if to much gas is sucked back through the vacuum lines if the vehicle is running rich. I intend to get it back on the road and running as a work truck, so hopefully this will give me something new to look at!

[@ScannerDanner]

good luck, let me know

[@Edi-01]

How did the truck start if all those wire harnesses were all mess up and broken lucky the car even started l had the same problem mines were different ones from the fuse box goin inside the car dashboard all burn and still worked fije until 3 month ago finally had to inspect and fix it ur the man bro good Job

[@vunit8213]

Scannerdan thank you for this video! This is exactly what my Escalade is doing!!!! Now off to try and find the wire! Hopefully I can follow your video so I can finally put an end to this nonsense!

[@ScannerDanner]

You will not find this exact problem on your Caddy (a completely melted and destroyed harness). It is going to look more like this video at the time stamp shown kzbin.info/www/bejne/q6rRlImwlK10qqMm45s This one is a shorted reference circuit, not an injector control wire but it is the same concept for finding the harness issue.

[@ScannerDanner]

@frosty9595 Two things, first you are correct in that if the injector has a 12v feed and you touched a test light (connected to B+) on the control wire that it should not light. If it did (as in the video) then you have a shorted control wire. Second, Chryslers do NOT have power to the injectors with the key on. The ASD relay controls power to them and operates off of the same driver in the PCM as the fuel pump relay. So there MUST be an RPM signal for power to the injectors.

[@ScannerDanner]

sounds like it my friend, just make sure you check that injector resistance if the driver ends up being the problem. watch my Ford COP video for what can happen with a shorted output

[@CHIBA280CRV]

Wow what genius engineered that design !

[@ChadFreeman757]

No one. The engineering behind the engine, the ignition system, the fuel system, the monitoring system, & the wiring came from different individuals. That’s why this happens. It’s common on 01-05 vans & the harness was rerouted after that.

[@ytoal]

Good work at showing all how to diagnose! Chasing a P0204 on a 2004 Ranger V6, this may be the issue

[@ScannerDanner]

do you have a ton of white smoke?

[@ScannerDanner]

Thanks man, for sure you have to think about the variables. They can burn you if your not careful.

[@Luisvegabroker]

I also troubleshooted a common problem of the o2 sensor wires frying on the exhaust manifold on these Jeeps plus the common pigtail connector bad connections at distributor harness

[@stuiecrosbie8560]

cheers, all four injectors click and don't skip a beat, I may have them sonically cleaned to rule that out, over here in the U.K there's a company you post them to, and they clean them and send back..giving the before and after results

[@ScannerDanner]

@foxholewilly Because it was the ground side of the injector that was shorted. So this just kept the injector on all the time. No increase in current flow from that. If the power side shorted to ground then it would have blown a fuse.

[@thesetruths1404]

Hi I have a 2007 Liberty 3.7L V6, 117,000 miles. Owned it since 67,000 miles. It operated perfectly for the first 30,000 miles and then it started getting a #1 Cyl misfire code P0301. It also seldomly gets a #1 cyl fuel injector circuit open P0201. It must be a very mild fault as the misfire freeze frame data shows it always happens at less than 350 rpm and when cleared it comes back immediately at next startup, cold or hot. So it seems to only happen once on startup as its moving up to regular idle speed. The miss isnt noticeable when driving or idling. Its getting 15.5 mpg fuel mileage. Doesnt burn oil. Doesnt smoke. Has great power. I've changed plugs and coils but no difference. Cleaned air intake, air filter, and ran cleaner through system. I've cleaned and inspected the injector plug and all wires but no difference. Dry / wet compression test of #1, 3 and 5 cylinders all read good: 160 / 175 psi. I'm wondering if there's a mild wire defect for that injector, or just a flakey connection somewhere. Has anyone tried to use a new set of compatible gauge wires and run them to a place closer to the injector control? I can't see where the wires go though. I'm not sure if I should just live with this, or troubleshoot it more. I don’t care about the engine light as we don't have emission requirements. Now that I know the compression is good, I'm not so worried about it. Any suggestions of what to do next? Thanks!

[@zackk695]

There’s mechanics that can do any repair and then there are those that can diagnose anything. I will pay you to come to Houston and work on my 05’ Duramax. It’s an injector problem stuck wide open so we can’t figure it out in a balance test. I bought 4 injectors and replacing them tomorrow just guessing. So tired of this crap and just want my baby running right. The old injectors are made by Standard through O’Reillys and I heard they’re good and now I’m replacing 4 and replaced 2 others about 6 months ago. I’m going with Bosch reman now

[@kristofvandenelshout5]

0:47 backprobe red lead to ECU connector injector control wire (ground) + black lead to “+” battery terminal Injector circuit open: 12,6V. Injector switch closed: 0V. Load uses up all the voltage.

[@ScannerDanner]

@Gizmopflege Not sure about the cat. The owner said that this was an intermittent problem for awhile. Good chance the cat. will need replaced. I'm not going to worry about it unless it sets a cat. code.

[@gsrturbo3786]

love the videos very informative. best automotive guides. Found out tho test light will not pick up every driver depends on manufacturer.

[@ScannerDanner]

@davymatheny These TBI systems should be spraying a lot. If you are not used to looking at them, you may think it is too much. It is possible the one that is spraying less is the problem. It would help to know your fuel trim numbers (block learn and integrator for your car). This would tell us if it is a rich or lean condition that you are dealing with.

[@markfothebeast]

Surprise, surprise. Another Caravan electrical problem. I completely tested the entire wire harness on an 04' Caravan with the NGC system. Fixed all the weakspots. One being the harness near the side exhaust manifold (which wears from heat), this also runs to the MAP, temp sensor, and ign coil. The other weak point is (on 2004+) near the PCM under drivers fender where the harness enters near the transmission range sensor. This can cause all sorts of goofy issues.

[@halleffect1]

great explanation regarding the ASD relay. that's the kind of stuff that always gets me.

[@ScannerDanner]

@ScannerDanner So with just the key on, there will be no 12v available to the injectors. This is why you could get an inaccurate result with the test light. It will back feed through the un-powered injector and find a path to ground through another circuit that is in parallel to the injectors. Resistance through this path will determine brightness of the test light bulb. Also it would depend on the test light you are using. Hope that makes sense.

[@ScannerDanner]

could be a lot of things, I need more info than that to help. Things that come to mind, distributor, weak coil (arching inside of the cap), low fuel pressure, plugged exhaust, secondary ignition problems (plugs, wires, cap and rotor)

[@alexandrecoderre9499]

Amazing stuff here. Thanks sir. Helped me diag my jeep 6.1 injector problem. Im subscribing right now. Great info here for an aprentice mechanic like me. First comment ever on youtube, i couldnt not thank you. Very well explained.

[@ScannerDanner]

My editing and filming has gotten a lot better :-)

[@monchologringo3754]

Really professional video, got the point, no only change parts....

[@ScannerDanner]

Only when possible my friend. Most of these are done in the field and I am not there when the new part gets installed.

[@holmesteang3152]

Dude thank you for this video my car is doing the exact that. I took my car to a shop because I was stumped. I replace tons of parts and all that shop did was undo all the parts I replace. Didn't solve a darn thing and the screwed me over with the bill smh. Again thanks bro I'm going to trace my injector wire on my car. I know one of my injectors stuck open just now sure which one.

[@ScannerDanner]

The worst case scenario for any shop is to get a car with a problem, that a bunch of parts have been replaced on. Especially in today's market that is flooded with bad new parts, right out of the box. I'm sorry you had that experience, but now that you found me, make sure you're doing the testing first before replacing parts! Otherwise you absolutely will be creating problems.

[@ScannerDanner]

Thank you. This problem ended up frying the sensor ground circuit in the PCM. We ran a jumper wire to ground to get it to run again. He is still driving it that way :) Not the right fix but whatever.

[@jasong6615]

So I tested my injector driver 2 and the pcm is not sending a signal, already replaced the injector harness, other injectors are getting a signal, do you run the jumper wire from the injector 2 driver wire or a different one?

[@steveschaible6722]

Please, how do you run a jumper wire to ground? Could you explain that a little more. From where to where? Thanks!

[@ScannerDanner]

@@steveschaible6722 do you have high sensor ground voltage after this repair?

[@BrianMann216]

nice video I have seen a few of those injector harness having problems like yours and also just underneath the plenum rubbing on the rail.

[@CapeFrank57]

Mr Dan, Same car just 2004 3.3L just a little different scenario showing code P0201 injector circuit open cylinder 1 car runs rough can not go over 2800 RPMs replace the injector replaced wires checked wire harness but no smoke coming out the exhaust can you lead me in the right direction what I have to look for thank you for your time and all your great videos very helpful to a garage mechanic Frank

[@ScannerDanner]

@davymatheny So you have either an injector problem or a torn injector o-ring (although this usually causes large drops of fuel within the spray pattern). If it is the injector, I don't think cleaning it will help. I have never cleaned an injector for spraying too much fuel. Replace it

[@justsaygold]

Very good video wish I had a mechanic like you to check a code on my GMC savana. Pretty sure it's a bad wire somewhere throwing a p1810 that is driving me nuts.

[@onecleangrill6644]

dan i wish i could drop off my dinosaur (91 cav) to you . im going crazy trying to figure out why i have no fuel prssure ,new pump,new regulator, no gas smell (leak down) cars old but belong to dad once again you are one the best on here you really care about teaching and doing it correctly (no mickey mouse stuff) your in the right field buddy and i will continue learning from you thanks dude

[@ScannerDanner]

@juanstrongman Do you mean your are still getting gas in the oil? Or there was gas in the oil? The stuck open injector would certainly have caused that. Something else to consider if you are still running rich is the MAP sensor may have been damaged from the injector voltage spikes back-feeding into it. Check MAP volts. KOEO should be around 4.5 VDC (depending on altitude where u live) and at idle should be around 1 to 1.5 VDC

[@train4905]

Superb sir,thankyou steve from the uk.

[@thebloody100th]

Excellent video, I learned a lot from this thanks for putting this up.

[@ScannerDanner]

@ScannerDanner In fact I almost can guarantee that this is your problem especially because you also have a TPS code. All the injectors, the TPS and the MAP share this same harness connector. Pull away all of the tape and you'll find what I'm talking about. You cannot miss it!

[@duanelange7410]

Hi ScannerDanner, love your videos. I had one of these in our shop a few months back with the same problem with the harness melted. I fixed the harness but the injector was still not firing correctly with the new harness. It was firing, but not completely. The driver in the PCM was grounding the injector enough to light a noid light but the ground was not good enough to handle the electrical load of the injector. I am now using the lab scope more at work but I often wonder what that would of looked like on the scope. Would that bad ground in the PCM show up even before the harness was fixed? Could I have seen it and known that the shorted harness had taken the driver out?

[@michaelschmidt7014]

I have a 2003 T&C 3.8L with the exact problem. From what I can tell either '04 or '05 the changed the location of the gang plug to the left side of the engine near the air filter hence no heat to melt the wiring insulation. I have a NEW wiring harness for the 2003 I am going to install a heat shield on the harness for protection. Getting these 'cursed 10 pin gang plugs apart is a nightmare.

[@ScannerDanner]

@busjockey1 no. its been redesigned. any revisions that i do automatically update everyone's copy. as far as new chapters go we will cross that bridge in the future

[@Spida69]

That's good shit brother.!!!!!!! Very detailed process eloquently explained. Good job! ;0)

[@ScannerDanner]

@howwefeel Did you watch the whole video? That is the same exact system in this video and the same exact harness shorts out. Find the bulk connector that all of the injectors plug in to and you will find your problem.

[@alwayslearning6355]

Hello Paul. From what I understand, current follows the path of least resistance. If you had an amp clamp on the control wire at the computer, would you still see amperage? My thinking is that you will measure current before the short not after the short. Thank you for continuing to help us.

[@ScannerDanner]

Yes an amperage measurement can also be used as a guide and in this case it would have been zero amps measured at the ECM

[@alwayslearning6355]

@@ScannerDanner Thank you so much for your help.

[@stuc6807]

I got a P0204 this is great info, missed this, though its on a common rail diesel with a feed voltage of 85-120 volts, Im sure its a wire issue as thats what the code points to, I just hope so because my brother just payed £5k-$8 grand for the vehicle a month ago with no engine light, Im going to do checks on the weekend of the circuit, its just a different kettle of fish than a petrol/spark engine

[@Rosman1974]

where is the video of you replacing the intake manifold harness?

[@ahfelgazzar]

Great video! At the end where you touched the circuit with the test light in an engine-off state, I didn't understand why isn't it a valid test. Where is that ground coming from if the circuit is disconnected?

[@alexmessina7652]

Ahmed El-Gazzar it can feed back thru the inj and potentially thru other components on same fuse and feed circuit. If there is a potential grnd somewhere it will find it, unless the inj circuit is completely isolated. Need to study wiring diagram to kno this. I think what Paul is saying is that if start the engine and therefore have a live 12v feed thru inj circuit you eliminate the risk of a misleading backfeed. If u wanted to use this method (ie engine off) and be more certain u cld see if u got the same result on a known good inj as with suspect inj ... if light is on for both it wld be and inconclusive test and u wld have to try KOER.

[@jpboileau]

That's some good stuff, bro! Thanks!

[@ScannerDanner]

Thank you!

[@immingark]

Thanks I have more ideas in what to look for.

[@ScannerDanner]

@stuie crosbie i meant headgasket not headset

[@davegengenbach5998]

This is awesome stuff, thanks for sharing your knowledge, loyal subscriber now.

[@ScannerDanner]

Thank you!

[@Mark1944089]

I had a feeling it was back at the Injector Wiring Harness side, PCM control everything in modern day vehicles

[@user-pt5nx1np5t]

02:30 😷 Paul you killed 99% of the mosquitoes in USA 😂

[@orakzaihangu]

3.2 porsche cayenne 2005 ignition coil no 1 was faulty and drive around 30 km and it was fine but little bit misfire. when I replaced the new ignition coil the car start but not move and I diagnosed by computer show these 3 codes p0261 , p0264 and p0267 which mean cylinder 1 ,2 & 3 injectors circuit low. please guide. I need to open the injectors or there is any short way .thanks

[@DrftJnkies]

I need you as my mechanic. Spent countless money in my town mechanics and im still with my existing issue.

[@tedkay]

Scanner Danner ! you the MAN!! just stumbled on this one ! nice!~

[@brianhenderson1702]

I have injector 1 problem P0201. I removed Injector 1 wire from PCM connector like you did but mine wouldn't start like yours did in the video to test it?

[@cowboycartelproductionscow2021]

What if every single injector is showing open circuit. Because that’s what’s going on with my 09 rt challenger. The dealership has already replaced my injectors, fuel pump, computer, spark plugs, coil packs, cam/crank sensors.

[@fast68chevy]

wow IMHO this is pretyt high level tech here,. and alot due to the acces to the scope machine screen deal in which we dont have one of and i dream wish that we did and that i need to and want to learn to use so badly some day somehow wow... great vid and info here, i am currently right now dealing with our 97 F150 pickup 4.6L that three injectors driver side are dumping raw fuel into those cylinders and overheating the cat converter and no idea why, brand new injectors and jut swapped replacement engine from a 98 car into it. did scrape damage slightly the wiring harness on pass side upper firewall when engine was going down into compartment, was tight fit no clearance flexplate teeth to the harness so im going to start there and also run obd II connector PCM info too. wow look at that caravan injectors wiring harness in this vid.. wow...!!

[@Luisvegabroker]

I had my friend help checked all ignition wires while under a load and pulled one wire at a time from the cap and determined the bad wire misfire ....check engine light has been reset , will see what happens now , the codes are gone and driveability without the misfire is is back to normal .

[@ScannerDanner]

I've never seen a stuck open injector that wasn't electrical in nature. Stuck closed, yes, stuck open, no. I'm sure it is possible, just never seen it. I have a video on a stuck closed injector, check it out.

[@stevenrushing334]

Thanks for the great video. I need you to work on my car.

[@Filmaker25]

Great vid Dan. I was wondering however if you get gas smell after the car has sat for awhile when you start it up is that the injectors. I have the 2000 neon. I know this is another vehicle. I have in fact changed out the gas cap, which I'm sure you have heard that can trigger an error code. But would the gas cap cause a fuel smell on start up?

[@luckyfreeman5079]

it looks like 2nd row top connector on the pcm 2nd row from headlight back starts with #1 injector then according to your diagnosis the 5th down is Injector #5 so must be 12345 then 6 on second row of top connector...

[@erickrayos]

great, my e46 m3 may have stuck open injector as well as it keeps flooding cylinder 5 and has almost the same smoke as this one had (mine looks a lot more of a pulse but the same white smoke) and it smells like fuel on my exhaust and my oil starts to smell like fuel which I will be changing before I even try turning it on next time. will be back here to update.

[@ScannerDanner]

any codes? vehicle speed sensor comes to mind. I have seen a VSS cause similar symptoms on a honda before.

[@hellzone100]

2:22, that's just the result of a car that's been neglected LOL

[@treborhi]

at 5:53 you said the computer is able to recognize a fault because it has an output state monitor that watches the voltage level. When the injector is on, the voltage should be low. When the injector is off the voltage should be high. So, I would think a solely mechanical problem with the injector, such as stuck close of stuck open, would not generate a P0200 code. Is this true? I was just gonna change the injector and hope for the best but it seems this code is more indicative of wiring troubles or PCM trouble than a bad injector. I've been getting the P0201 code intermittently for the past several days. It only comes on when I first start the engine. When I start-up cold, the check engine light (CEL) doesn't come on and the engine runs fine. I'll drive to my destination without any issues. But when I return to the car and start-up fully warmed-up, the CEL comes on and the engine runs rough (obvious misfire) and will continue to run rough until I get home. Sometimes I just get the P0201 code and other times I get both the P0201 and the P0301 code. When I get home, I use the scan tool to clear the codes from memory, so I can see what happens at next start-up. I've never had a situation where the CEL came on while I was driving. I find that strange. I would think a loose wire or bad connection would more likely come loose when the engine is running and vibrating. Thus, I was thinking that these symptoms more likely point to a bad PCM. But, I don't know how to verify that. Any thoughts? Update: I swapped the No. 1 and No. 3 cylinder fuel injectors. Afterwards I started getting codes for the No. 3 cylinder. So, apparently I have a bad fuel injector.

[@half_r_mk5]

Amazing work. Thanks for sharing this.

[@TriciaShade]

wires were not burned out like the video above but were melted together in some areas, when I pulled them apart they showed no signs of bare wires, are they still bad? Do they still need to be replaced? We also checked the voltage at the injectors when we changed them and they were ready properly. By the way your video was great!

[@ScannerDanner]

probably not. Did you check that for a headset problem?

[@CoolasIce2]

Good shizzle. It would be of help to post the wire diagram somewhere to go along with the video.

[@sxikho6184]

I'm getting P0201 through P0204 on my car. It's 4 cylinder, but the car runs fine. I've only had one problem happen with it releasing raw fuel and smelling like gas and it was for like... 30 seconds.

[@ScannerDanner]

If you need help, post your questions here. Thanks! You will be expected to at least have a voltmeter and test light to follow suggested tests. scannerdanner.com/forum/post-your-repair-questions-here.html

[@wyrdo1501]

dealing with a stuck open injector, if i pull the control wire from the computer and start the engine, and its still stuck open would that basically tell me i had a short to ground without using the test light? assuming the injector itself is still good.

[@lauramendoza8779]

Nice video good job explaining skills