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1990 Honda Accord LX - S Light flashing and will only shift into 2nd and 3rd


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jforrester
New User

Oct 10, 2017, 10:12 AM

Post #1 of 4 (178 views)
1990 Honda Accord LX - S Light flashing and will only shift into 2nd and 3rd Sign In

Hello everyone, I have a 1990 Honda Accord LX. For the past few weeks it has been doing weird random stuff, i.e., wouldn't shift down into 1st and the speedometer stopped working but then worked again. Now the S Light has started flashing and the car will only shift into 2nd and 3rd.
About 2.5 years ago I replaced the TCU (transmission control unit). I bought a used part from a junk Honda off eBay, but it was a factory part. The car has run great until recently. I also recently replaced the speed sensor. That fixed the speedometer issue but the S Light started flashing about a week after that. I don't think the speed sensor caused the S Light to flash and don't even think the speed sensor was bad. I think it was all random, like everything else that has been happening. My question: It behaves with the same symptoms that happened when I replaced the TCU before 2.5 years ago. Would it be likely that the TCU is bad again, just coincidentally (especially since it was used), or is this something that just doesn't go bad often? Would it point to something else being the problem? I could buy another TCU and replace it but I don't want to waste money if it's not likely to be bad again.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Oct 10, 2017, 10:14 AM

Post #2 of 4 (176 views)
Re: 1990 Honda Accord LX - S Light flashing and will only shift into 2nd and 3rd Sign In

Instead of just taking wild guesses, you need to have the transmission codes read and that will give you a starting point.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



(This post was edited by Hammer Time on Oct 10, 2017, 1:44 PM)


Discretesignals
Ultimate Carjunky / Moderator
Discretesignals profile image

Oct 10, 2017, 10:51 AM

Post #3 of 4 (161 views)
Re: 1990 Honda Accord LX - S Light flashing and will only shift into 2nd and 3rd Sign In


Quote
When the A/T control unit senses an abnormality in the input or output Systems, the S indicator light in the gauge assembly will blink at equal intervals and the LED display on the A/T control unit will blink a problem code when the ignition key is turned on. However, when the Service Check Connector (located to the lower right of the glove compartment) is shorted with a jumper wire, the S indicator light will also blink the problem code when the ignition switch is turned on.








Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

(This post was edited by Discretesignals on Oct 10, 2017, 10:52 AM)


gsferraro
Enthusiast

Oct 11, 2017, 1:50 PM

Post #4 of 4 (102 views)
Re: 1990 Honda Accord LX - S Light flashing and will only shift into 2nd and 3rd Sign In

Hello,
The above post is exactly what you need to do, the connector may be blue in color, jump the connector and count the flashed, (there may be more than one code) let us know what you find.






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