1991 honda accord se the s light is flashing.put in new tcu.still flashing.doesnt start flashing untill i drive the car about 2 miles.when i first start the car the sport mode button on the shift handle works fine.even after it starts flashing shifts fine. just stays in sport mode.no codes .
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the flashing S light on your car is your tcu "transmission control unit" sending a trouble code to your dash this could mean alot of differant things if im not mistaken it will be an electrical problem not mechanical. is your speedometer just randomly jumping? the reason i ask is i drive a 91 as well and my S light is blinking and my speedometer jumps and sometimes doesnt work at all the the code for the S or tcu is 4 which is the vss "vehicle speed censor" eventually your check engine light will probably come on and if the code is 17 then its your vss as well but you can check the code by getting either a paper clip or small wire and using it as a jumper wire there is a little blue wiring harness on the passenger side of your car under the glove box use the paper clip or wire and plug them in "dont worry you wont get shocked ive done this plenty of times and in the rapair manual it tells you to do this" when you do this make sure the paper clip or wire is secure and put you key in the ignition and turn it to where your dash lights up but dont start the car the S light will start to blink count the blinks "1 long blink is 10, 1 small blink is 1" example if the light stays on for a couple of seconds and turns off and then blinks 4 times that would be code 14, if your check engine light blinks count that as well if you need help with checking any of it there is a video on you tube i believe the title is how do you check the check engine light on a 91 honda accord. or something of that nature. if you get the codes tell me what they are I may be able to find them and get more specific about what is goin on I hope this helps
This is your transmission control unit telling you there is a problem. I have another post here (http://www.fixya.com/cars/t5554380-92_honda_accord_d4_light_flashing) with details on how to diagnose. This link says "flashing D4 light" but the issues it the same. 90-91 accords have flashing S lights for TCU errors, and 92-93 have flashing D4 lights.
The MAIN RELAY is up above your gas pedal near the cruise control module. (Almost behind the dash opposite of where your "pull out" coin drawer is). It will be a gray or brownish/orange box. Use a 10mm socket to move the metal cruise control unit out of the way and tap the Gray or Brownish/Orange Plastic box while someone tries to start the car.
Don't buy a new one, just pry the cover off of it with a flat head screwdriver and look close where all the sharp pins are sticking up on the board to find the broken solder connection(s). Heat the faulty pin with a soldering iron until the solder puddles around it and your good to go. The crack in the solder will be smaller than a human hair, look close & wiggle it and you'll see the loose connection. There is usually no need to add solder, what is there is enough, it just needs melted again.
BLINKING S Light - Could be your VSS (Vehicle Speed Sensor - CODE 17). Google this: OBD0 ACCORD S LIGHT - or this pic shows a burned out TCU (Transmission Control Module)
Usually the VSS - You can check the code by jumping the "test wire/plug" located behind the pass side plastic kick panel on the lower right. It has a blue tip, place a small wire or a paper clip in the terminals to make a connection. Turn your key forward two clicks to the ACC (not start). Count how many times your "D" light flashes. If it flashes 4 times, you need the VSS changed.
Go to eBay and type: 93 Accord VSS
It's cheap there, Autozone charges over $100.
If it's not that then consider a malfunction in your TCU (Transmission Control Unit) located under the pass side floor carpet by where they put their feet. It's the smaller of the 2 control units. Sometimes there are 2 capacitors that burn out in there. You'd need a Phillips screwdriver to take the TCU apart to look at the circuit board, etc.
If it's not that then consider changing your trans fluid, wiping the magnet tip drain bolt clean and cleaning your shift solenoids. You'll need about 2.5 quarts and it must say Import or Honda Approved on the ATF container. HONDA DOES NOT RECOMMEND GETTING A TRANSMISSION FLUSH. Good luck...
Is the flashing steady or is there a pattern to it? If there is a pattern, count the flashes. This will give you error codes relating to the TCU/ECU (Transmission/Electronic Control Unit). If the flashes are steady then it could mean that the TCU itself is bad.
1 long = x10
x shorts = 1 So 1 long and 5 short=15 Please check the light and respond as to whether or not the flashing is steady or not. If not please include the code that is being flashed. Also, include model of the vehicle.
It may be related to the transmissions electronic control unit. The most common symptom would be that from a dead stop the vehicle feels like it starting out in high gear. The transmission computer or TCU (transmission control unit) suppose to control the automatic upshifts an downshifts but may not be downshifting the trans back to first gear. To verify if this is the problem try shifting the transmission like it was a manual shifted transmission. From a dead stop start off in 1st an manually shift. When slowing down, shift down manually just like it was a manual transmission. On a turn you should be in 2nd gear or 1st manually with your hand shifter depending on how fast you are going. If it drives and shifts good, without stalling, you may have a bad TCU to diagnose.
it is the Transmission Control Unit. you have to find the reason why the TCU is flashing the D4 fault code. not replace the unit. have your vehicle scanned for another code. your transmission or transaxle is giving you a warning that something is wrong .
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.
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