Re: 1993 Honda Accord Automatic Transmission Control Unit Circuit Diagram
 

I don't find any other components to be in bad shape but thanks for the
advise.

Rocky Dada

Re: 1993 Honda Accord Automatic Transmission Control Unit Circuit Diagram
 

I don't find any other components to be in bad shape but thanks for the
advise.

Rocky Dada

Re: 1993 Honda Accord Automatic Transmission Control Unit Circuit Diagram
 

I don't find any other components to be in bad shape but thanks for the
advise.

Rocky Dada

Re: 1993 Honda Accord Automatic Transmission Control Unit CircuitDiagram
 

'Curly Q. Links' wrote:
> RockyDada wrote:
>> Thanks a lot for the quick response back. Luckily, I had access to
>> another such unit with the same resistor in good condition. It is
>> exactly the same as the one to it's left. The resistor is a 15 ohm, 5%
>> tolerance, 1/2 watt resistor. I plan on getting it from the local
>> Radio Shack store and work on it tonight. Will let you know how it
>> goes.
>>
>> Regards.
>> Rocky Dada
>
>
> ----------------------------------
>
> While you're in there, why not replace some to the capacitors? They're
> famous for eventually exploding, and then it's even harder to figure out
> what they were unless you find the right web page. You can spot the bad
> ones (which have been running HOT) because the plastic label has
> regressed, leaving the top of the caps naked.

yes, but only if they show signs of distress. generally, the quality of
honda componentry is very good, and one of these factors is capacitor
size. in the past when i've replaced them, i've had difficulty sourcing
some of the same types honda uses, and if i do find them, the
replacement has physical size issues.

>
> What wrecked the resistor in the first place?

good question! i believe that resistor is in the output chain, so i'd
definitely check for correct operation of whatever it's supposed to be
driving.

Re: 1993 Honda Accord Automatic Transmission Control Unit CircuitDiagram
 

'Curly Q. Links' wrote:
> RockyDada wrote:
>> Thanks a lot for the quick response back. Luckily, I had access to
>> another such unit with the same resistor in good condition. It is
>> exactly the same as the one to it's left. The resistor is a 15 ohm, 5%
>> tolerance, 1/2 watt resistor. I plan on getting it from the local
>> Radio Shack store and work on it tonight. Will let you know how it
>> goes.
>>
>> Regards.
>> Rocky Dada
>
>
> ----------------------------------
>
> While you're in there, why not replace some to the capacitors? They're
> famous for eventually exploding, and then it's even harder to figure out
> what they were unless you find the right web page. You can spot the bad
> ones (which have been running HOT) because the plastic label has
> regressed, leaving the top of the caps naked.

yes, but only if they show signs of distress. generally, the quality of
honda componentry is very good, and one of these factors is capacitor
size. in the past when i've replaced them, i've had difficulty sourcing
some of the same types honda uses, and if i do find them, the
replacement has physical size issues.

>
> What wrecked the resistor in the first place?

good question! i believe that resistor is in the output chain, so i'd
definitely check for correct operation of whatever it's supposed to be
driving.

Re: 1993 Honda Accord Automatic Transmission Control Unit CircuitDiagram
 

'Curly Q. Links' wrote:
> RockyDada wrote:
>> Thanks a lot for the quick response back. Luckily, I had access to
>> another such unit with the same resistor in good condition. It is
>> exactly the same as the one to it's left. The resistor is a 15 ohm, 5%
>> tolerance, 1/2 watt resistor. I plan on getting it from the local
>> Radio Shack store and work on it tonight. Will let you know how it
>> goes.
>>
>> Regards.
>> Rocky Dada
>
>
> ----------------------------------
>
> While you're in there, why not replace some to the capacitors? They're
> famous for eventually exploding, and then it's even harder to figure out
> what they were unless you find the right web page. You can spot the bad
> ones (which have been running HOT) because the plastic label has
> regressed, leaving the top of the caps naked.

yes, but only if they show signs of distress. generally, the quality of
honda componentry is very good, and one of these factors is capacitor
size. in the past when i've replaced them, i've had difficulty sourcing
some of the same types honda uses, and if i do find them, the
replacement has physical size issues.

>
> What wrecked the resistor in the first place?

good question! i believe that resistor is in the output chain, so i'd
definitely check for correct operation of whatever it's supposed to be
driving.

Re: 1993 Honda Accord Automatic Transmission Control Unit Circuit Diagram
 

Well folks, it did not work out even after replacing the resistor. I
guess I will have to bite the bullet and buy a new (or used) TCU since
I don't see any other obviously distressed components. If it's an IC,
I would definitely not know how to diagnose or fix it. Thanks for all
your help though.

Regards.
Rocky Dada

Re: 1993 Honda Accord Automatic Transmission Control Unit Circuit Diagram
 

Well folks, it did not work out even after replacing the resistor. I
guess I will have to bite the bullet and buy a new (or used) TCU since
I don't see any other obviously distressed components. If it's an IC,
I would definitely not know how to diagnose or fix it. Thanks for all
your help though.

Regards.
Rocky Dada

Re: 1993 Honda Accord Automatic Transmission Control Unit Circuit Diagram
 

Well folks, it did not work out even after replacing the resistor. I
guess I will have to bite the bullet and buy a new (or used) TCU since
I don't see any other obviously distressed components. If it's an IC,
I would definitely not know how to diagnose or fix it. Thanks for all
your help though.

Regards.
Rocky Dada

Re: 1993 Honda Accord Automatic Transmission Control Unit CircuitDiagram
 

RockyDada wrote:
> Well folks, it did not work out even after replacing the resistor. I
> guess I will have to bite the bullet and buy a new (or used) TCU since
> I don't see any other obviously distressed components. If it's an IC,
> I would definitely not know how to diagnose or fix it. Thanks for all
> your help though.
>
> Regards.
> Rocky Dada
>
sorry to hear it. to be honest, if a resistor cooks, there's got to be
a reason - and chips are definitely a candidate. make sure your
solenoids are working ok before you discard the tcu.

Re: 1993 Honda Accord Automatic Transmission Control Unit CircuitDiagram
 

RockyDada wrote:
> Well folks, it did not work out even after replacing the resistor. I
> guess I will have to bite the bullet and buy a new (or used) TCU since
> I don't see any other obviously distressed components. If it's an IC,
> I would definitely not know how to diagnose or fix it. Thanks for all
> your help though.
>
> Regards.
> Rocky Dada
>
sorry to hear it. to be honest, if a resistor cooks, there's got to be
a reason - and chips are definitely a candidate. make sure your
solenoids are working ok before you discard the tcu.

Re: 1993 Honda Accord Automatic Transmission Control Unit CircuitDiagram
 

RockyDada wrote:
> Well folks, it did not work out even after replacing the resistor. I
> guess I will have to bite the bullet and buy a new (or used) TCU since
> I don't see any other obviously distressed components. If it's an IC,
> I would definitely not know how to diagnose or fix it. Thanks for all
> your help though.
>
> Regards.
> Rocky Dada
>
sorry to hear it. to be honest, if a resistor cooks, there's got to be
a reason - and chips are definitely a candidate. make sure your
solenoids are working ok before you discard the tcu.

Re: 1993 Honda Accord Automatic Transmission Control Unit Circuit Diagram
 

"jim beam" <spamvortex@bad.example.net> wrote in message
news:xuidnckqvqg0kmjZnZ2dnUVZ_t-dnZ2d@speakeasy.net...
> sorry to hear it. to be honest, if a resistor cooks, there's got to be a
> reason - and chips are definitely a candidate.

I got into this late, but that is a big 10-4. That resistor was dissipating
several watts (I would guess 5-10 watts, judging by the surroundings) and
that means a short somewhere. A shorted capacitor or power transistor is the
way to bet.

Wrecking yards are the solution, for sure. The circuit board has suffered
more than I like to see, so even finding and replacing the shorted part
would be a partial solution.

Finally - not to worry you too much, but it is worth mentioning - the short
may be external, like the wiring to the transmission. If so, the replacement
will do the same thing. It may be worthwhile to remove the cover of the
replacement TCU so you can shut down power as soon as the resistor smokes
(if it does). Once that is sorted out, replacement of the resistor should
get you working again.

Mike

Re: 1993 Honda Accord Automatic Transmission Control Unit Circuit Diagram
 

"jim beam" <spamvortex@bad.example.net> wrote in message
news:xuidnckqvqg0kmjZnZ2dnUVZ_t-dnZ2d@speakeasy.net...
> sorry to hear it. to be honest, if a resistor cooks, there's got to be a
> reason - and chips are definitely a candidate.

I got into this late, but that is a big 10-4. That resistor was dissipating
several watts (I would guess 5-10 watts, judging by the surroundings) and
that means a short somewhere. A shorted capacitor or power transistor is the
way to bet.

Wrecking yards are the solution, for sure. The circuit board has suffered
more than I like to see, so even finding and replacing the shorted part
would be a partial solution.

Finally - not to worry you too much, but it is worth mentioning - the short
may be external, like the wiring to the transmission. If so, the replacement
will do the same thing. It may be worthwhile to remove the cover of the
replacement TCU so you can shut down power as soon as the resistor smokes
(if it does). Once that is sorted out, replacement of the resistor should
get you working again.

Mike

Re: 1993 Honda Accord Automatic Transmission Control Unit Circuit Diagram
 

"jim beam" <spamvortex@bad.example.net> wrote in message
news:xuidnckqvqg0kmjZnZ2dnUVZ_t-dnZ2d@speakeasy.net...
> sorry to hear it. to be honest, if a resistor cooks, there's got to be a
> reason - and chips are definitely a candidate.

I got into this late, but that is a big 10-4. That resistor was dissipating
several watts (I would guess 5-10 watts, judging by the surroundings) and
that means a short somewhere. A shorted capacitor or power transistor is the
way to bet.

Wrecking yards are the solution, for sure. The circuit board has suffered
more than I like to see, so even finding and replacing the shorted part
would be a partial solution.

Finally - not to worry you too much, but it is worth mentioning - the short
may be external, like the wiring to the transmission. If so, the replacement
will do the same thing. It may be worthwhile to remove the cover of the
replacement TCU so you can shut down power as soon as the resistor smokes
(if it does). Once that is sorted out, replacement of the resistor should
get you working again.

Mike