Question about 2008 Honda Accord
Light comes on when ignition is turned to on but when you start the car the light starts flashing and does not go out
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Posted on Jan 02, 2017
SOURCE: 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 anyways...to 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 pieces...email me at firstname.lastname@example.org or call me @816-286-8851..ill be glad to help
Main relay ........$10.00..
10mm deepwell ...$4.00
Posted on Nov 09, 2008
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 .
Posted on Nov 21, 2008
I had a '91 Accord. When the car would get hot, i.e., sitting closed up in the hot sun, the car would not start. Not even turn over. I don't know what the D4 light is. I called John Eagle in Houston where I bought it brand new. The service supervisor said it was probably the main fuel relay. I think that's what he called it (it's been a few years). This relay shuts the gasoline off to the engine when the car gets too hot. It is a safey thing so that the car won't catch on fire, like in the case of an accident. He said to open all the doors and raise the hood so the car can cool off. Sure enough, after about 15 minutes or so, the car would start right up. If I remember correctly, I think the relay is located under the carpet on/near the firewall on the driver's side. Seems like the Honda OEM part was about $80.00. Don't know if this helps or not, but I thought I would throw in my two cent's. Good luck.
Posted on May 19, 2009
You more than likely have a problem with the TCU (transmission control unit). It may also be other things. You need to seek professional help before spending money on a TCU that may or may not be the problem. It takes an expert to diagnose this problem.
Posted on Oct 03, 2009
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