How To TroubleSHOOT a bad ECU / ECM

[@andrewwilson561]

His casual voice after shooting the ecu.... perfect

[@waynesanders1406]

Instructions unclear, there are now 12 holes in my driver's fender and the engine is leaking coolant, and oil. How do I remove the virus from engine?

[@dnrink44]

No 1/2 gas, 1 match, and watch it burn!

[@ibenripped]

I can't stop laughing. Tears coming to my eyes.. Laughing uncontrollably. Best comment of this generation. Thanks for the humor.

[@Atonement-]

Put a mask on the front bumper cover.

[@angushoover8670]

LMAO

[@nicholasjwood8668]

That was freaking awesome! hands down the best diagnostics I've ever seen, I plan to utilize that technique in the near future.

[@AO-qy8fp]

By far one of the best Bleepin Jeep vids I've watched. Gonna take apart my PCM when I get home now!

[@Marktheshark804]

this fucking guy is the best I've never seen something so simplified. Had to favorite this one. LOVE IT!

[@bleepinjeep]

thanks for the awesome comment! glad i could help

[@Tanglerwr]

Nice! Love your solution - there's nothing like a 1911 for "troubleshooting"!!!

[@earlbucklin8323]

you have come a long way.................

[@AnotherOverTaxedTaxPayer]

If my ECM is bad, will the car temporarily start if I spray starter fluid in the throttle body? That is what my car does.

[@jorgelcastrotorres4388]

Mine too...do you know why is that? Is it because you are making the explosion for the ignition?

[@HeyZeus1]

sounds like it may be the fuel pump. or maybe the fuel pump fuse or relay.

[@onemanarmy1980]

CPS

[@applepoop10]

I wish cars still have carburetors and mechanical ignition systems, they were easier to fix and diagnose. I miss the days with things were simpler.

[@cconnon1912]

You have romanticized nostalgia for old cars. They didn’t work well. Cars didn’t Harley last 100k.

[@garyh5225]

​@cconnon1912 you don't know what you're talking about at all

[@michaelhodges452]

Ain't no Norton gonna fix that virus

[@JackStrangelove]

lol

[@sd33zy313]

+Michael Hodges lol

[@AdammP]

Michael Hodges Norton can't fix shit anyway. all it does is slow shit the fuck down

[@Nthstar]

Norton is like a virus in itself

[@longlifeprinters9]

Wow, that was a good one. Especially adding some bullet holes & seeing how it made the jeep barely run & then not run at all. Nothing beats experience & that is what your sharing so we don't have to bang our head against a wall trying to figure out a problem. Thanks.

[@bleepinjeep]

good point on the reflash, ive never owned a car that new so i didnt even think about those new fancy computers! Does anyone know abut what year cars started using ecu's that need to be flashed when swapping?

[@Mikebasshead]

My pcm went out on my 97 jeep zj and cost me 220 dollars and a core charge also my coil shorted out and shorted my pcm out and ihad to get a new one if u get a used one u have to get it flashed to ur vehicle or it will not run right took me months to figure out why my pcm went so if i was everyone with a jeep id go get a new coil before urs shorts out

[@bleepinjeep]

sorry, my best guess would be the 02 sensor, have you replaced that?

[@brianwilsonbeachboys]

How do you know the junkyard ECU is good? Open it up and look for shorts?

[@applepoop10]

Buy it and test it. And its broken, return it. Most junkyards have a 30 day return policy

[@axlegrind4212]

when he starts the motor from under the hood at 2:42 it looks like the coil wire is sparking to the heater hose. weird. and if the engine refused to run in the 'on' position, but runs in 'start', that leads me to thinking the ignition switch is bad.

[@rckymtncwgrl1]

Thank you for this. I've been researching how to diagnose my ECM for over an hour and no one else has showed opening it up and what to look for INSIDE it. THANK YOU! Unfortunately I do not own a pistol so I am not able to recreate the shorts, but very helpful! Hahaha

[@MikeDHasSkills]

I bought the Jeep high performance computer for my '89 mj when the Chrysler dealers had only 12 or 13 left in their inventory. Fortunately i had removed it for troubleshooting prior to it catching fire and burning. I now have it in my '90 mj

[@sherryhenderson4026]

I have a question. I purchased an 04 Jeep Liberty, less than 24 hours I got a no bus reading on my cluster. Replaced the cluster, BCM, and just replace the ecm. The dealership said my network is down, that's what the no bus is. So now after paying for the repairs my jeep won't star. It's completely dead after starting and shutting off! 😭I'm in such need of help

[@bleepinjeep]

sorry to hear that... what is the question? what is the dealership saying now, I would take it back and tell them to fix what they broke.

[@ibenripped]

Get the old parts back and reinstall them. If you have or had security system check for lockout.

[@xunknownx6400]

not sure if you still check this but if i go get one from the junk yard for my 99 will it work? i thought they had to be programed via Vin

[@iwilldo1982]

Believe needs to be flashed or re programed ?

[@bleepinjeep]

wow, could be a ton of things... Is the 86 not carbed?

[@bridgetannsoccio5768]

THANK YOU, That settles it....now to find a junk yard to swap out my recently discovered defective ECM.....no im no mechanic....but I always like to be a little informed before I take my 2004 GJC to the shop. Good Info man

[@sea_bass21]

Also thank you for the help. I had a problem with a harley in a fire and you just confirmed my suspicions.

[@ymp5000]

Was that your magazine falling as you drew?

[@bleepinjeep]

+ymp5000 no, was the holster

[@ymp5000]

BleepinJeep Copy that.

[@codymoore8709]

I know this is a very old video, but hoping you see this. Got an 88 2.5 Comanche, blew the engine on the drive home from buying it so everything worked before that. Swapped a 94 wrangler 2.5 into it, had to Frankenstein a little bit nothing too serious. It cranks but won’t fire. Changed cap, rotor, plugs, wires, ignition coil, distributor and tested the crank position sensor and got 197 ohms so I know that’s good. You think it’s the ECU? Even though it ran fine before? And would I put a 94 wrangler ECU in it or replace the original? Hope to hear from you

[@WorkableWax]

I'm not a jeep guy but it would make sense that this things can take a bullet and virtually keep goin. That's pretty cool

[@trinidadysquierdo7924]

I have a 84 jeep Cherokee 4 cylinder I did the nutter bypass running great so with that said is it possible to remove the computer?

[@stevenlupanko2983]

Sounds like a metal old minelab detector. So hears my issue I got in my car the drivers side of my foot well was waterlogged next I notice a warning light car icon with spanner through it came on the dashboard milometer graphics.keep partly disappearing and I could smell smoke, took it to a backstreet garage he gave it a clean out under the bonnet , unblocked a pipe and got rid of debris. Hes old school doesn't have diagnostics machine or a thinking brain it seemed. He couldn't explain why the revs are so high when I start it up and why it's fluctuating. I think its water that has got into the ecu but.once I start driving it it's not to bad the revs drop back to something near normal but not quite. Just had a mot on it a few weeks before and it passed that. I am just wondering if it's safe to drive and what the worst possible senario is? Do I need to invest in a crash helmet or will the engine just die overtime and how long do you think I could drive it like this? Grateful if you could help sorry I can't divulge the make or model of the vehicle as I don't want to embarrass myself haha.

[@khndenmark]

You will never do that if you knew what a used ECU cost in Denmark, I am crying now ;))

[@bulentkaraca5174]

new ones 187 $ in usa

[@TheCheasequah3]

If you ever need one I've got a shit ton I'm a parts hoarder, would love to come to Denmark, been to Sweden and Norway beautiful place I've thought about moving there skoal brother

[@jimmyblue8259]

A very good video here explaining and showing examples of some of the things that causes ECU problems.

[@noehctuccmliw]

Best computer trouble 'shooting' video 🤠👍🏼

[@jobysims7763]

Does the part number on the pcm have to be the same as the original one . Both are 1999 but different part numbers

[@TheKuza261]

I have a 91 Comanche 4x4 with an AMC 4.0 straight six with a Aison 4 speed. I power washed it a while back and SEEMS since then it shifts at 3000RPM. From first to second and from second to third 3K. 3-4th is as normal. No bucking or jerking. From what I gather it can be a few things. A sensor possibly a TPS, or the TCM. I paid 600$ for it and it ran and shifted mint before all this started. I know the transmission itself it good. I've ruled out bad shift solenoids. Don't know how to proceed please give me you're feedback. Thanks. Joe

[@markyboi79]

I've got a 95 XJ, my check engine light does not illuminate at all bulb is good, cant pull codes via key method, was able to in the past. On petrol it has all of a sudden lost 30-40% power even more noticeable at low rpm's, it runs great on gas (LPG)(nearly double the power and torque)as the injectors are turned off, but on petrol has all of a sudden become awful, really hesitates down low and lacks heaps of power. any ideas, i'm suspecting a faulty ecu... new HP ported polished head from heavy duty casting, edelbrock roller rockers, exhaust and updated non pollution intake, new plugs, leads filters, cap,rotor,coil, ... any ideas welcome\

[@bleepinjeep]

hmmm, not sure bud. If there is no check engine light its not going to have any codes. Here in the states we only run on petroleum, no propane, so I am not sure how that works but I wonder if you could have a clogged catalytic converter?

[@markyboi79]

BleepinJeep just an update, so, purely a coincidence that the CEL light had blown around the same time my issues started, replaced it and was able to pull codes(went to a few places to get the codes read and no body has the correct connector). Has thrown a lean fuel code, I was starting to lean toward a fuel pump issue, drives even worse now. Mash the throttle and it bogs and backfires and carries on. Used to spin the 33 muddies when kicked hard in the guts. Gonna grab a fuel pressure gauge tomorrow and test. Cheers for the reply. Love your videos, there aren’t a whole lot of xj’s left in Australia so it’s hard to get good advice here.

[@edchambers2090]

What could cause a 1996 jeep grand Cherokee Laredo to stail while driving or at a red light

[@ibenripped]

Ed Chambers the answer is a drunk driver.

[@Hill-ij8cr]

Was hopin you could help me out a bit my pcm went out 1996 4.0 the manufacturer says i have to have it reset and all this but they cant do it can you install a junkyard one

[@BUKWulfSh0t]

Hey quick question after getting code 1294 my 97 xj won't start and if it does it shuts off after a few seconds... any idea?? Please, it's my only ride to work

[@Nthstar]

Thanks BleepinJeep Good video Does anyone know if a failing ECM would illuminate the ABS light ?

[@bren4086]

PASTBETTER it could yes, but I test the sensor first

[@bleepinjeep]

I would suspect it just needs a tune up. New spark plugs w/ correct gapping. New cap and rotor, new spark plug wires. If that's not it then my second guess - a vacuum leak.

[@bleepinjeep]

well you didnt say what kind of vehicle you have but the older cherokees are under the dash, big silver thing. And the newer cherokees are on the left fenderwell under the hood, black. Just unplug, unbolt, and put the new one in.

[@jeepinjeffxj]

OK... 97 sport sat for a few months, got start ups and yard trips, and out of the blue a dead (less than a year old) battery. Jumped it just fine but as soon as the cables came off all hell broke lose, chugging and running rough, speaker feed back, jumpy gauges a few other things until death and unresponsive. Does this sound like an ECU or a major fault elsewhere? Just want to know where to start thanks

[@bagabuck1]

I have a pcm from my 1998 cherokee classic I took out the screws but cannot get it open any suggestoins that don't involve shooting it or useing a hammer?

[@jameshorrocks2939]

I check the computer first with a test light at the coil and then at an injector. You should get a pulsing light at the feed wires. That proves 2 important functions are working. The crank sensor, and the computer. Then I start checking voltage at various sensors. If that is good then likely the computer is good. Symptoms will at that point direct you to potential solutions.

[@iwilldo1982]

That sounds like best advice out of everything read or watched here,,thank you brother,,

[@jameshorrocks2939]

@iwilldo1982 be cautious when using a test light at coil and injectors. One runs off negative and the other uses positive. Cannot recall which is which. Juststart out testing of the negative terminal to be safe.

[@alexchuchman7077]

I might need to change the ecm on my 05 vw Passat tdi if I get a used ecu will I need to reprogram it ?

[@CopperheadGarage]

Sell it get a jeep

[@bleepinjeep]

First I would start with a good battery, if under a year it should have full replacement. Then try again and let us know where you stand.

[@jeffreyschnoldt5388]

Question. ? Does the power hit the ECU before it goes to the relay ..example 12 volt to ecu then to fuse box then to ignition coils. Have no spark to coils, have gas but plugs are not firing checked all seems to lead to ecu

[@sinisternm]

repairguide.autozone.com/znetrgs/repair_guide_content/en_us/images/0900c152/80/08/ad/5b/large/0900c1528008ad5b.gif

[@sinisternm]

battery to fusible link that powers ecm then goes to icm(ignition control module) which triggers the ignition coil. the ecm gets info from the crankshaft position sensor to tell it when to fire. i would check all these things.

[@blueteamsix]

Should I take out the PCM before shooting it? And Was is one shot then test then three more and try again. If I don't own a gun will AutoZone shoot it for me?

[@wackpackxj]

"Trouble shooting" GET IT!?!

[@portal2476]

my 1999 jeep is having parasitic draw on the battery can that happen from a bad eco?

[@iwilldo1982]

Believe corrosion in instrument panel or gauges can cause amp draw ,, kill battery charge,,

[@bleepinjeep]

Not if I have anything to say about it!

[@Lonewlf7676]

Nice choice of the 1911. If you're going to shoot holes in things they might as well be big ones!

[@mrfixit-wb5qb]

mine is sealed how can i check the curciut...also thing like my lights ,blinkers,and sometimes my check engine light would alluminate but throw no code when i check it....recently my 99 ram was running like shit didnt throw any code to find out the crank sensor was bad ...i guessing its the pcm...i checked it with my mac tools scanner...couldnt read it though my cousin who had a bigger better scanner at ammco not sure how he know but his scanner was able to figure out wat was wrong...so im guessing the pcm is bad

[@nkhan7804]

Hi sir I have jeep Cherokee 2000 ECU read but no burning componts inside

[@MrDrummerman32]

Before I reset my ECU (94 Grand Cherokee) I was getting codes 12 (I know that one isn't a problem) 27(bad injector driver) and 14 (MAP sensor voltage too low or high) but I'm still having it die occaisonally after ignition, at idle, or when driving. In addition, it will lose all power (in the drivetrain only) occaisonally when under load and come right back. I've reset the ECU and the only codes I'm getting are 12 and 55. DO you think it's the ECU in my Jeep?

[@destinyarnold3188]

hey guys so i have a 94 jeep grand Cherokee 5.2 yes i know its shity motor but i just replaced the ecu and it still wont start what could it be ??????? anything helps thanks ..

[@logandewolfe8461]

Hey guys, I REALLY need some help. I have a 1999 xj 4.0 4wd. A month or so ago my jeep started chugging and stuttering until it stalls out. I got a code and it was the O2 sensor. so i pulled it out, and it worked fine. fast forward a few weeks i replace the bad sensor with a brand new sensor (both up stream and down stream.) same problem again. so right now I am running it with the engine light on and the o2 sensors out. PLEASE HALP

[@williampratt7132]

Matt , ya do a greate job of simplifying almost every procedure, I have been dealing with a shift issue, 3rd to Overdrive lockout. Checked the TV , shift linkage adjustments and pulled the power to the tcu, still no overdrive. I suspect the od lockout solenoid to be faulty. I do know there are other factors the tp sensor and one other. 96 cherokee xj, 4L h.o. .. any suggestions

[@heatherrhodge2588]

OMG Hi-larious! i didn't expect to learn anything from this video after seeing you shoot holes thru your ECM but was happily surprised when that wasn't the case! it helped me seeing your vehicle still ran even with holes blown thru the board! I've been trying to diagnose the cause of a U0107 DTC in my car and all the voltage & continuity checks have been normal. I replaced the TAC module so the only thing left that i can think of is a faulty PCM but before watching this i assumed there would be more issues than just the electronic throttle if that were the case. thx 4 this!! it gives me a lil more confidence in replacing the PCM. only prob now is one of the connectors is stuck in the PCM. I've got the other 4 out but I'm almost wondering if the dealership super glued connector A bc I'd just taken the car in for a PCM recall where they put a cheap little plastic piece over it and i wouldn't put it past them to mess it up thinking I'd be forced back there 2 have them repair it

[@jasonaswader2]

If I have a 2000 IL6 grand Cherokee can I go to junk yard and swap one as well?

[@xDETROITxCITYx]

my 86 XJ is running very very rich, ive replaced all the sensors that i could think of that would work with that. ECM next?

[@frankbighen6260]

Hey Matt!!! How many ecm’s have you changed out? I was told to make sure the numbers match and it’s out of the same exact year . Another gentleman told me it didn’t have to be the same exact year. Any insight on this. Also might try that car computer exchange !! Thanks in Advance .

[@bleepinjeep]

Just this one... I dont recall where I got it from though, it was a long time ago.

[@frankbighen6260]

BleepinJeep hey well my issue turned out to be my throttle positioning sensor. I replaced it and am back running again.

[@reyovick]

Helping a buddy troubleshoot the stalling problem with his Jeep. This video recreated exactly the behavior of the vehicle (turn over while engaging starter then stalls out w/o starter kicking) and confirmed what I had read on forums about it maybe being the PCM / ECM / ECU. Thank you!

[@sea_bass21]

"Lets give it a shot now, see if it works." he says after putting like 5 shots in it.

[@melton7142]

May I add guys that no start is not the only sign of bad ecu. It can be bad fuel economy, Lack of engine power, hard starting, doing all kinds of crazy things. Lastly if you get a computer from a junkyard for an older car, the computer maybe bad even tho the car starts. ECU fail more than you may think and you may not even be aware that its the ecu. I work for a company that test and rebuild ecu.

[@boostjunkieMike]

Awesome shirt, where can I buy it??

[@bleepinjeep]

that was the holster but yeah, I just went with it.

[@mikebarts1678]

Hey Matt! GREAT VID!.....I ask you: does the ECM has anything to do with the cruise control on a 1990 Cherokee, 4.0l, automatic trans? I love my Pioneer....but the Cruise just blinked out.

[@killmypain666]

OK, I've watched the video a few times, but I'm still having problems. Do I shoot it before or after checking for shorts? Also, Should I remove it from the jeep before I shoot it?

[@Mister_anderson257]

hello I have a cherokee xj sport 1998 2.5 TD, this limited does not pass the 2000 rpm, can be the ecu ???? also smoke when I accelerate, greetings from Argentina!

[@roblusignan8386]

You are freakin' brilliant. 'Installed a virus'...nice.

[@xxALEXIZBEASTxx]

i laughed hard when he said he just installed the virus lmao

[@angushoover8670]

Virus comment cracked me up.

[@paulsthormes251]

Good video bad transistor can be repaired with $2 That is the transistor sends power to fuel injectors .

[@mastertek383]

You gave it your best SHOT now let me take a STAB at it

[@OldGriz708]

That reminds me of my first XJ. It was a '98 sport that I swear was struck by lightning ⚡. When we bought it from a neighbor he told me it just needed a fuel pump when they parked it 7 years before that🙄. I ended up replacing almost every sensor on it. The ecm took a dump and we borrowed one from a friend and tried it. It would start and run about 5~6 seconds and for🤨. Took me all damn day to remember his XJ was a 2000 or 2001 and had a chipped key..........

[@PMGaming101]

hahahah missed this video bad ass bro you are always my go to guy for xj info thanks a lot bro Paul from Quebec

[@herreraarmory2586]

Hey what year is that jeep!

[@MADJeeps-jd1sd]

Where is it located in your jeep

[@darkangeldesigns1]

Gotta love a video that starts out with shooting a jeep part! I think my ecu might be bad in mine. I seem to have no electric connection. Acts like battery is dead with full charge. Everything else is good. Had a mechanic swap out my ecu but I think he put in another bad one 🤞 I can get this remedied

[@cbr6864]

Jeep can make a straight 6 that will run 300K without a hitch but can get the dome light to turn on without stalling the engine out at idle.

[@franciscomacias9603]

Mine just went out, it was reading codes 11, 111, 112, 116. The first two are system ok....dunno why it read 2 trouble codes. Hooked up a 4.0 PCM and was able to get codes off my scanner where the old PCM I wasn't able to read or recover codes easily. It's been in the truck since 92. So they don't last forever.

[@plascenxia21]

Is there any way you can help me out and sell me one I can't seen to find one for my xj need help

[@bleepinjeep]

Tell mark at wranglerfix.com that I sent you

[@francinevannorman1649]

Where is the ECU located on my 2005 cadillac SRX 6 cyl????? PLEASE

[@tomcooper920]

Is a 9mm or a 40 better for diagnostics?

[@bleepinjeep]

45 for extra punch

[@valerijjakunin]

For the SBEC the same rules of solution?

[@electriciandallastx9182]

Thanks for the concepts you have contributed here.

[@forcars460]

Ma dude lol the best educational video i hv ever watched *.*

[@foxy2loxy]

AS happy as shooting it would make me, it blows my mind the wiring lenght in the driver door. See i have discovered the alarm runs thru it and when my1985 cherokee has a stalling problem its because of those wires..i have every one nail polished to color. code..and when the drivers door gets swung open by wind or me the stalling atarts again..I love the video ..Thanks

[@walther9161]

Please show where this part is and how to swap... for the novice! Thnx

[@gearedupproduction8290]

Will it run still if it’s bad

[@EthanE3]

You are the Jeep world's Mr. Rogers.....

[@ExploitTheVibe369]

"Let's give it a shot now and see what happens"... you just gave it 4!

[@deborahwadden3733]

LMAO I friggin loved this goes to the extreme but gets the point across depends where it frigged up is what headaches it will give ya

[@mookie0271]

pretty sure the ECU was stuffed as soon as you put a bullet into it, but reality would tell you to just buy an OBD2 scanner or just get a paperclip idf it is the old OBD system and bridge the two terminals, it takes 5 minutes with the scan tools to find out if your computer has had it

[@cindyrella24673]

Is thIs the same as a BCU?

[@bleepinjeep]

Some vehicles have a separate body control module, some are all in one with the ecu, and tcu

[@juansolo1617]

Are you from Virginia? We have the same accent. Just curious.

[@johnvesely1918]

My Jeep sputters randomly when im driving. it mainly happens when i give it gas or driving at a low speed. i cant find the problem would ypu guys know any trouble shoots?

[@bleepinjeep]

.45 acp is the best for ecu diagnostics!

[@RyanNagy]

That was seriously brilliant man. Thanks!

[@DaMalts]

your jeep sounds BA, what kind of exhaust do you have?

[@bleepinjeep]

I just have a gaping hole right in front of the cat, need to get it fixed someday!