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Old 06 Jan 2011, 11:46 am
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Default 93 Honda Accord "D4" light on dash blinking?

I have a 1993 honda accord 10th anniversery addition. Since I bought it back in September the D4 light on my dash constantly blinks. It confused me at first so I drove it around in D4 thinking it was drive. Little did I know it is over drive I think. I am still not for sure. Now I drive it in D3. So hear about 2 months ago it started having a problem. I would go to take off from any where, and it would hesitate and just barely go. So everytime I go to a complete stop I have to put it in 2nd gear and shift it to D3. Thats the only way it will take off right. This gets pretty irritating at times. Im also sure its not good for my car. This morning I got up and went to leave and my "brake lamp" light was on so I checked all my brake lights they were fine. None our out. So I got down the road, and the car started acting a little strange like my brakes were acting bad. So I turned around and came home. After I got home I got on the internet lookin up "brake lamp" light issues. I found out that it can also be related to my transmission. So I started looking about the "d4" light and I didn't find to much about it. I found something that said to count the flashes something about a code. It didnt give me direction on how to do it or what to do after I read the code. I was wondering if anyone could help me maybe its a selinoid or a senser please help I dont know what the heck to think?
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Old 06 Jan 2011, 12:01 pm
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I have a 90 Accord and that same problem started with me. The thing I found it was is the TCU )Transmission Control Unit) its located under the floor mat of the passenger side. Once that starts going out it makes the car sluggish and not want to take off as well as making the "S" light or shift indicator light flash. My suggestion is take it to a Transmission shop and confirm that and start looking for a new one. Keep in mind that you may want to find the serial number on the one now because you will have to match that up to the new one to be correct.
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Old 06 Jan 2011, 12:16 pm
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The flashing D4 light means the Transmission Control Unit has a problem - usually a bad input. The blink code - after jumping the two pin service check connector located below and to the right of the glove compartment - has both long and short blinks. A long blink indicates 10, and short blinks indicate one each. One long blink and three short blinks is 13; the range is from 1 to 15.

You may decide to take this to a transmission specialist. It gets pretty involved. If you want to proceed I recommend getting the Helm manual on the car (first source). It is pricey but has exquisite detail on servicing the car.

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Old 06 Jan 2011, 12:31 pm
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Posts: 881


D4 means your transmission will select all the gear ranges (1-4) available for it. Over-drive simply refers to the final transmission gear in which the wheels are turning faster than the engine producing the least amount of torque but the greatest amount of MPG. There is no damage done to the transmission or engine in this gear range.

D3 means your transmission will only select gears 1-3 but not the last gear (over-drive). This is perfectly fine for "around town" driving and also does no harm.

2 means your transmission will only select gears 1 or 2.

1 means well, just 1st gear.

When you have a blinking light coming from the transmission PRNDL lights, it means there was a problem with your transmission detected. Simply put, it's your transmissions version of a Check Engine Light. Honda transmissions are very sensitive and often fail when not maintained, so driving it around with whatever issue it's having ever since you first noticed the blinking light probably put unnecessary strain on it and damaged it further. At this point, whatever shop you may go to will probably just recommend a new transmission as it probably needs rebuilding. But you may also get lucky and it could just be a problem with the torque converter or another easy fix issue. If I were you, I'd quit driving the car and take it to a shop or the dealer as soon as possible.

The brake light coming on is an indication of low brake fluid. You just simply need to add more brake fluid. As your brake pads wear down it takes more and more fluid to get them to press up against the brake rotor or drum and slow the car, so you compensate for that by adding fluid.
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