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Car Forum / Honda Cars / August 200691 Accord Transmission Control Unit -- component replacement
I removed the automatic transmission control unit from my '91 accord and opened it up. The capacitor marked C32 which is a 330uf 10v electrolytic has failed and leaked electrolyte onto the board nearby, giving it a black appearance. Also the resistor marked R41 is burnt. It is color coded Brown-Green-"BURNT" and has a gold tolerance band. I guess the burnt band is a Black band so this would be a 15 ohm resistor, just like the one next to it. It and the one next to it measure about 15 ohms. Does anyone know if 15 ohms is correct for R41? I have read on this forum that there are two resistors that fail. Does anyone know which one it is? I can easily replace these 2 parts, but my questions are: What makes these parts fail and is there another commonly-failed part that makes them go out that should be replaced while I have the TCU out of the car? Thanks much for the help! John > I removed the automatic transmission control unit from my '91 accord > and opened it up. The capacitor marked C32 which is a 330uf 10v [quoted text clipped - 11 lines] > them go out that should be replaced while I have the TCU out of the > car? electrolytic capacitors "perforate" with age. the electrolyte breaks down and there is a burn through between conductors. i don't have a tcu handy, but will look in my box tomorrow to see if i can find the resistor value. Chip It seems that electrolytic capacitors do not age well. This begs the question: Should all the electrolytics be replaced to prevent future problems or is this particular one (C32, the 330uf) under more stress? Is this the cap that failed for you? Thanks for your help. John > > I removed the automatic transmission control unit from my '91 accord > > and opened it up. The capacitor marked C32 which is a 330uf 10v [quoted text clipped - 17 lines] > resistor value. > Chip I have a 1990 honda accord and I think I have narrowed the sport light that wont go off, the car starting off and staying in 3rd gear and the tcu red light on to the tcu hvaing something wrong with it. You named all these weird parts I have never heard of and y ou said they were easy to replace so if I took my tcu out and looked at it would the parts needing to be replaced just be obvious and would they be easy to take out of the tcu? And also where do you get the new needed replacement parts? Also where could I find like a replacement tcu except from the honda dealer? I had the same problem on my '91 Accord with the same symptoms you described.. Found a replacement tcu from a local junk yard for like $90. Transmission has been working well since. I remember at that time, ordering a tcu from Honda would have taken 3-4 months because no dealership had the part in their inventory. I believe it might still be the same today. - Dave > I have a 1990 honda accord and I think I have narrowed the sport light that wont go off, the car starting off and staying in 3rd gear and the tcu red light on to the tcu hvaing something wrong with it. You named all these weird parts I have never heard of and y ou said they were easy to replace so if I took my tcu out and looked at it would the parts needing to be replaced just be obvious and would they be easy to take out of the tcu? And also where do you get the new needed replacement parts? Also where could I find like a replacement tcu except from the honda dealer? > I had the same problem on my '91 Accord with the same symptoms you > described.. Found a replacement tcu from a local junk yard for like $90. [quoted text clipped - 3 lines] > months because no dealership had the part in their inventory. I believe it > might still be the same today. i don't know the price but we stock the tcu. it's common. 3-4 months someone was blowing smoke up your a.s. Chip > > I had the same problem on my '91 Accord with the same symptoms you > > described.. Found a replacement tcu from a local junk yard for like $90. [quoted text clipped - 6 lines] > i don't know the price but we stock the tcu. it's common. 3-4 months > someone was blowing smoke up your a.s. I remember even for the '91 Accord LX, there are several varieties of the tcu, and ideally you want to match the code exactly, based on your current tcu. Are you saying that you stock all of the varieties for the '91 Accord LX? If so, that's quite impressive. Let me know which dealership that is and I'd be sure to look you up next time I need a hard-to-find authentic part. :) - Dave > Chip I have two honde TCUs. The circuit board for one is labelled "EAT X4J/A-B" and the other is "X4J/A-E". In both, the R 41 and R42 resistors are the same (15 ohm). I have a 92 Accord with the same problem. In researching this problem, I heard the release solenoid on the shift handle will short out and burn up those resistors. See the following link for a horror story on it. As your email implies, we know if you don't fix the original problem, you can keep replacing computers (TCU's) until your pocketbook quits or you give up. http://www.ripoffreport.com/reports/ripoff49761.htm Good luck! Mac >I removed the automatic transmission control unit from my '91 accord >and opened it up. The capacitor marked C32 which is a 330uf 10v [quoted text clipped - 15 lines] > >John yall's info has been very useful. i too have the problem with the S light on my 91 accord LX. at first it stayed on. i found that if you disconnected the battery that it would reset the TCU and the light would stay off. this fix could last anywhere from 5 minutes to 5 months. so whenever it would get stuck on again i would simply reset the TCU by disconnecting the batt. minor inconvenience. but now rather than stayin on or staying off, it flickers intermitantly. now ill be cruising on the hwy at 65 in 4th and suddenly here comes the S light and kicks me into 2nd. so i took your advice and that of someone at honda. i removed my TCU. took me forever to figure out how to remove the kick plate. opened the box and here is my TCU. smells burnt but not real bad. but none of the transistors or resistors seem to be burned or show any physical signs of trauma. nothing is blacked over, no gunk, no signs of any problems. so now im lost. where do i go from here? thanks in advance guys. Jax |
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