Question about 1992 Honda Accord

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I just replaced the main relay on my 92 honda accord and it still will not start and D4 continues to flash

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First make sure your new main relay is working. After you turn the key two clicks, point your ear towards the back seat and see if you can hear the fuel pump running. It should run for about two seconds (or as long as the check engine light says on) and then go off. You should hear the relay click under the dash after the check engine light goes out, and that will be the relay turning off the fuel pump. If don't hear the pump running or the click of the relay, the new relay might not be working. If you hear the click and not the pump, the you probably have fuel pump issue. Check fuses first!

If both of those check out, then you need to make sure you have spark. Get a spark tester ($7) and a spark plug gapping tool ($1) from you local auto parts store (oreilly's, autozone, advance auto parts, etc), but don't get one of those in-line spark testers because it will be really hard to get the wire all the way down the spark plug tube and back on to the spark plug. Get one like the pic below.

.I just replaced the main - 263848a.jpg
Set the gap on the tester between .039" and .043" using the gaping tool, then connect one of the spark plug cables to the tester, and then use the clip on the tester to connect it to a solid ground on the car. There shoud be a good place on the right side of the valve cover on top of the should see a small wire bolted from the corner going to the power steering pump. Put it right on the bolt. Give the car a few cranks and see if it sparks. If not, you probably have a bad coil or ignitor, both are inside the distributer. There are ways to check for those if they are bad, but that is for another post. One other thing to check is for corrosion on the contacts inside distibuter cap. You can either scrape it clean or just buy a new cap & roter.

The D4 light is from the TCU (transmission control unit)...letting you know that there is an issue somewhere. I already have another post here about how to diagnose it.

Posted on Oct 08, 2010


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My 92 Honda Accord will not start in Hot weather {90 to 100 degrees plus} also I noticed when these episodes occur the drive indicator light, on the dash will flash off and on. The engine will turn...

a common problem with this year accord was the main relay. they have bad solder joints so when they heat up, the solder joints didn't make good contact, and you have a d4 blinking and no starting problem.

above is a link on how to locate and remove the main relay, and if money is an issue, use a soldering iron to do the link below because a new main relay is around 50 dollars. its a video to resolder the joints on a main relay of a honda civic, but the same concept applies.

hope this helps. goodluck

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1 Answer

Why my honda accord 92 flashes d4 and no start engine

Sounds like a possible problem with the soldering in the main fuel relay. Check out the step by step in this link and see if it helps.
summary: The Honda or Acura turns over but won't start in hot weather is asymptom of a main relay going bad. This is the result of the poor solder application from the factory. As a consequence, raise areas on the joint indicate a "dry joint" which can lead to an open circuit. The dry, open circuit is the main cause of no start. This is partly caused by the buildup of heat on the terminals which expand, contract and subject to vibrations. It is likely that a layer of hard oxide has built up inside the solder joint. The layer of hard oxide has to be removed by desoldering. Other than this, there are no known mechanical problem with the main relay.

Mar 06, 2011 | 1992 Honda Accord

1 Answer

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Change your main relay assembly under the dash on drivers side. I was able to get my small hands under there and change mine out readily--not easy to get to as I didn't want to take the dash apart, but I got it done. If you have other problems after then find you a used TCU unit and change it out (passenger side where they put their feet, pull the carpet up, you will see easy, easily replaceable).

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you have a transmission fault the D4 light blinks to tell you that there is a transmission problem when the light is blinking the transmission computer put the transmission into limp home mode so it will not shift normally and you should try not to drive it very far when it gets to this stage you need to have the transmission codes check to pin point the problem

May 29, 2009 | 1992 Honda Accord

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92 Honda Accord LX 2.2 liter d4 flashing 1 long 3 short acts like over drive going on and off or switching back and forth between d3 and d4 when in d4 dealer could'nt get any codes from when they...

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92 honda accord lx

okay everybody...i did it myself....replaced the main relay and the TCU box..but i didnt use another OKI manufactured TCU..i bought the Denshigiken manufactured one....(this was a 2nd manufacturing of the TCU)....when it first arrived today i opened the module up to check the resistors and capacitors...and noticed the completely different configuration and parts inside...this worried me..but i hooked it up my amazement all problems vanished ..and everything works now..(cruise control, shift interlock, D4 light, tranny shift, brake light, intermittent no start, everything that was wrong..must have ran through this stupid little resistor) ......i solved his problem for less than $100.00..and less than an hours work....i can get more of these Main relays and TCUs if someone needs or needs help locating and removing/installing new me at or call me @816-286-8851..ill be glad to help

Main relay ........$10.00..
TCU................. $80.00...
10mm deepwell ...$4.00

Jul 18, 2008 | 1992 Honda Accord

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