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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
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!
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 email@example.com
Thanks again Gabriel Seguev
Jake Moon: check engine etc, i would recommend them if you cannot do it yourself. quick shipping and good product.
brandon woods: what company did the repair? thanks in advance.
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: 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.
ANDRE B: 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?
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.
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..
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...
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!!!
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.
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: 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: 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.
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
maha77: Does a bad ECM mean the transmission is bad too or just the ECM?
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.
DAWOOD RYAMI: thank you sir ...
Jake Moon: "themanazz" has corrected me- he says the 820 is 82 ohms, not .82
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
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
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
Jake Moon: 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
TheManAzz: 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: 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.
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.
Marcel Alexander: Do you know the ohms on those resistors?
Jake Moon: Hey roger, feel free to write me at firstname.lastname@example.org
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.
HOW TO FIX RAV4 ECM ECU TRANSMISSION PROBLEM. **READ DESCRIPTION!**4.3
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