HOW TO FIX RAV4 ECM ECU TRANSMISSION PROBLEM. **READ DESCRIPTION!**




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eddie short: I found a place on ebay AUTO MODULE SOURCE they sent me one for $158.00 I installed the new one which lasted about two weeks before it started acting up, the lady I spoke to said there could be a variable solenoid that's bad or something causing the computer to short out, anyone have any experience with that?

Brad Streets: So the scanner is telling me it's a shift solenoid, either #1 or #2, but maybe I should re-solder the resistors on the ECU first to see if codes disappear? Also, does the rav4 have to be re=programmed to turn off the service light, or does it relearn or shut off through the code scanner? It's my friends son's suv, and I'd hate for them to buy a $150 solenoid only to find out they did not need to spend the$$

Ndy Ly: Do a resistors test if ya not sure if it's bad or not...

Jonathan Dragon: Well its been a month now and its working great. So for me that confirmed it. "Bad Solder Joints." Thanks jake moon. Well made video and it saved me time and money. You could probably just reflow the solder for a short fix but I replaced the solder on those resistors in the video. Can't thank you enough....

SuperRucar: Thank you, this video saved my pocket, redid the welds of the items listed, nor had to change anything, just took some oxidations processor and function normally again, was giving the same problems in the gear changes, reduced alone and not advancing to first second, the unit spent on mechanical problems and accused the solenoid b. And the mechanic ever wanted to take off my exchange. Lucky I watched this video before! I'm from Brazil and I have a 2001 Rav4.

bigbad1ton: Fixed mine.

bmhcooray: Hey Jake, I am having this same shifting issue with my 2003 RAV4 - Chili. I took it to a mechanic and after checking the code he said that this was a Solenoid issue in the Transmission. Was this the case with you too, before you decided to take a look at the ECM? Cheers

Sakis Petropoulos: well sorry but there is absolutelly no usefull information in this video excpet the catchy title Nice of you 53.000 suckers including me have been watching your video

Aiman Alhroub: 100/100

Walter Rodriguez: Hi jake, thanks for your information, I could repair my rav4, if any more selfless people like you, our world would be better, greetings from Puerto Rico

Technishun: OK, I had serious reservations on this task. Reading the comments only vulcanized my feelings, but decided it was well worth trying as the ECU was coming out anyway. The PC board looked brand new coming out of my 2003 RAV4, so there was no oxidation - very nice manufacturing quality, I might add. But, being a Sr. Electronic Engineering Design tech, I've come across some 'impossibilities' in my debugging career, so if there are folks who said it work....I'm down with that. I did not stick to the few items mentioned by Jake - heck no. If I have an intermittent, I will reflow the solder on ALL the components, if I have to. But, I decided to stick with the high current items involving ANY of the resistor packages described (1210, I believe: .12" x .10" - BTW, for you DIYR's - Digi-Key Corp is your ultimate friend for finding parts of this nature). And, I continued to reflow the devices connected to said resistors (reflowing all these resistors, of course): all power control IC's (a number of 20-pin (?) IC's), and all power drive devices (black, 3 legged parts with tabs solder to the board). I just shoved it back in place after reworking for a test drive - and IT WORKED!!! Many thanks to you Jake for posting this. Otherwise, I would have spent a couple, or a few Franklins on this fix! One last word to the wise: if you cannot solder, meaning, if you don't have the proper tools to start with (small diameter soldering tip, thin gauge solder, ample visual magnification), and you're not experienced with PCB rework - do not attempt to try this!! Soldering is not rocket science, but debugging your rework error might be.

Aiman Alhroub: Thank you!

Gary Spooner: Repairing circuitry must be left to a professional. Sending that computer to a shop for repair will give you a warranty. You are a cheat trying to figure out what method is used to fix the computer and then blasting it all over youtube. Identifix is another cheat program - soon enough an 8 year old will be able to diagnose a complaint.. Give it time. Eventually, the only expertise available to actually diagnose a problem will be a Dealer and they do not share info at all.. 

Orin green: I hate reading the comments cuz I watched the video and it seems promising then comments are discouraging.

Jake Moon: check engine etc, i would recommend them if you cannot do it yourself. quick shipping and good product.

Jake Moon: Not necessarily. The poor shifting issue will cause accelerated wear of the friction material on the clutch disks so if you drive it long enough it will damage the transmission internal components. The ecm controls electronic solenoids in the trans. The solenoids cause gear shifts by manipulating the pressure and flow path of hydraulic trans fluid to the clutches. Get your ecm fixed first. Then if trans slippage is still present you may suspect the transmission.

Jake Moon: very true. this repair video isnt so much to help you save money as it is to assist people who enjoy the satisfaction of doing it themselves such as i do. if you have to google "how to solder" or have to look up how to remove the ecu from the vehicle then this is not something you should attempt.

Francisco Veliz: Jake hi I live in Chile South America and I have the same problem with the Toyota Rav4 2003. The models sold in Chile are different as those sold in other parts. I own a electronic laboratory of computers so I imagine my technicians can fix. But I can not find where to buy the resistences we explain. I would like to get information please. Thanks. Please your kindly answer to mu email gseguev@yahoo.es Thanks again Gabriel Seguev

Jake Moon: Most problems with an ecu or instrument cluster or other circuit boards are actually quite simple. The most common I've seen is broken solder connections, bad resistors, and bad capacitors. But if it didn't work then maybe I missed something. I doubt it though because its much less likely that the cause of the problem is actually two separate parts of the circuit, since there would have to be no symptoms until both separate parts of the circuit failed. I don't think 50 miles is sufficient IMO

Bay Drifters: Do you know the ohms on those resistors?

Jake Moon: On my Saturn it took about 400 miles to relearn the proper shift timing after I replaced the pressure control solenoid; I was too lazy to put the ecu into quick learn mode with the scanner. But believe it or not, I have been known to be wrong from time to time so until I run into another one to repair myself and verify it we won't know for sure. Unless somebody just pops the cover off of their repaired ecu and takes a look.

TheManAzz: @mangofever233 820 is 82 Ohms, R330 is 0,33 Ohm. On my ecu there were fine, resoldered it and almost rest of the board without luck, any other ideas?

Jake Moon: @TheManAzz hmm...the only thing i can think of at the moment is that the ecu needs time to relearn the proper shift timing etc. as this shifting issue starts to occur, the ecu will increase/decrease the transmission shift adaptive values to try and correct for it. the high resistance to the solenoids will cause the shifts to be longer (the ecu measures the time it takes for the trans to shift by comparing input and

Speedo Tronix: This fix wont work dont waste time. You must replace the solenod drivers in the computer! You do not have to change the resistors!

elio villacinda: ESTIMADO AMIGO USTED POR CASUALIDAD REALIZA ESTAS REPARACIONES A ESTOS EQUIPOS, SI ES ASI A DONDE SE LO PODRIA ENVIAR EL ECU

Jake Moon: way is to simply drive the vehicle. on most cars it takes about 100 miles for the transmission to relearn these values without starting the relearn proceedure using the toyota scan tool. (as far as i know, only the toyota scan tool has this capability) The distance required will vary quite a bit on the type of driving. i would guess it takes about 30 times of stop, acclerate, cruice in high gear half a mile, repeat. so, that is my recommendation to you. i am quite positive this is the

gravey07: What are the beige/tan rectangular individual chips on the board??? How can they be tested? Is there any good websites for learning this kinda stuff?? Thanks

Jake Moon: Im about 90% sure the 820 is .82 ohms and the r330 is .33 ohms. I found that info while searching for replacement resistors. I think they are .5 watt, but may be 1 watt. If your good at Google searching you should be able to find them. They are not common though; I only found one distributor on the whole net.

Jake Moon: You may be able to use multiple higher impedance round resistors to work instead because they are easier to get. E.g. two ten ibm resistors in parallel equals one 5 ohm. But there is also the issue of wattage.

SpeedometerRepair: To get the value of the ohms on the resistors you go as follows: you get the first 2 digits for the value and the third digit determines the number of zeros that you add to the value The ones on the board with the 820 are 82ohms if they were 821 they would be 820 ohms. These type of resistors are harder to find than regular resistor (thru-hole) butt they can be replaced with thru-hole as long as the resistance is the same.FYI they have no polarity.

MsRogeraguirre: hello roger aguirre of Nicaragua I have a 2001 rav4 with faulty ecu with the same fault, I would like to get in touch via email to see if I could provide more information on how to repair my ecu is already the second that I damaged the previous the U.S. for repair. Thanks I hope I can help.

maha77: Does a bad ECM mean the transmission is bad too or just the ECM?

brandon woods: what company did the repair? thanks in advance.

Jake Moon: output speeds) and therefore it will apply the shift solenoid sooner or increase the line pressure or both. if, by resoldering the resistors you correct the high resistance issue, the adaptive values will be far from where they should be. there are two ways to correct this. one costs money-go to the toyota dealer and request that they perform the "transmission adaptive relearn proceedure." i am not telling you to do this because they will charge you at least 40 dollars for it. the free

Richard Rodriguez: I tried it too. Did not work. Drove it for about 50 miles, still nothing. I just bought a refurbished ecu from a local shop and all problems went away. I guess that there is something else to it. I did not expect it to be so easy, so not surprised anyways. Thanks for your effort though.

Jake Moon: to properly flush the trans, drain it, fill it back with about five quarts, then flush while running with the cooler lines disconnected. the fluid that comes out the cooler lines comes from the torque converter though so you only get about half of it flushed anyways so thats why i dont usually bother with it. 50% for drain and fill vs 75% for lots of time doing a flush isnt worth it to me.

Jake Moon: @MrRockinneil "themanazz" has corrected me- he says the 820 is 82 ohms, not .82

Jake Moon: Hey roger, feel free to write me at mangofever23@gmail.com

DAWOOD RYAMI: thank you sir ...

Jake Moon: i think it would be a safe call that this is your problem. if you dont know how to solder just send it in to an ecu repair facility. and repair the ground points as well if they are corroded, e.g. powdery white film covering the solder. it takes a bit of driving once installed for it to start shifting properly unless you get a remanufactured one then they reset the trans adaptive memory for you. also i would just do a drain and fill of trans dont bother flushing anything.

carr33: Just re-touching the solder of only all the resistors indicated in this video and refreshing the ground contacts indicated, fixed my 2001 Rav4 for severe transmision shifting issues. Thanks Mangofever!!!

Tom T: I just happened to find this video... I rebuilt thousands of ecu, ecm, tcm etc. The worst thing you can do is open up the box and mess around with these boards.. The dealer wants some place in the neighborhood of $1,000 with a core exchange.. It's just not worth playing with them...

Circuit Board Medics: Our rebuild service offers a complete solution that is plug and play ready when you get it back. Our technicians are IPC certified with the repairs being performed in an ESD (electrostatic discharge) safe environment. There is no need for programming after the repair, and we offer a 1 day turnaround on the repair. Feel free to check us out on the web (CircuitBoardMedics) to place an order for repair.

Jake Moon: exact issue, the resistor problem. i have had people email me with successful results. but what is more, i thoroughly examined my repaired ecu for signs of new solder and new parts and that is the only thing i saw. although i have been known to make a mistake from time to time, i regularly make repairs to circuits such as these so i'm pretty confident in my findings. if you dont mind, please let me know what you find or if it is unsuccessful. --jake

LETITGO1977: I am in a similar predicament. I am taking over my parents 2002 RAV4. My parents have had it sitting in their garage for two and a half years and are moving away, so I would like to get this up and running as an additional car. Prior to it being out of action, it was shifting harshly but problems were ignored so installed one day while driving. With what you did with the ECM, do you think the ECM repair (in addition to flushing the old fluids) would have this up and running?

Tom T: A rule of thumb is stick to what you know.. The price for rebuilding them is just a few hundred dollars and a pro does the work and chances are they will get it to work again in possible... But if you mess with it most of them won't touch it anymore and even if they do it maybe so messed up it won't work anymore..
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