1991 Honda Accord Trans s light

This is a trans issue, and OBD scanners won't read these. Jump the 2 pin OBD connector and count the light flashes to get the code #. Then go online to find a list of codes for your Honda.

Definitely not good. The transmission is slipping internally due to worn gears and clutch packs. It will have to come out for rebuilding, IMO. Have a transmission shop check it out.
Good luck.

usually the problem is the TCM or transmission control module. They are known to go bad. If transmission is working ok then this is most likely the problem.

you may need the electrics checked?or fuses an links

Have you flushed trans? Other problems with these is the shift & linear solenoid pack. They are available aftermarket.

the light is flashing to let u know an electrical fault is present in the trans or the trans control module.

It's the transmission computer.Is located under the front carpet on the passenger side.
I had the same problem.

Take care

Carlos Bentancor
[email protected]

It is without question your TMU (Transmission Control Unit) It is located behind the passenger side kick panel. You can buy them on EBay for about 79.00 with exchange it will have a burnt diode and is a common honda problem.


Lugnut61

Last year in the summer of 2007 I had the same problem with my 1991 Accord dx. I replaced the Transmission Control Unit (TCU) and the light went out and the car has been driving fine every since.

A green flashing "S" is similar to a check engine light. It is telling you that something in or on your transmission is not functioning correctly, such as the speed sensor or shift control solenoids. If it starts flashing and the speedometer stops working or the transmission shifts weird, take it to a mechanic.