94 Honda Accord LX D4 Light Blinking
#31
That lamp flashes the code when you put a jumper across the SCS connector. Just like checking for engine error codes - the CEL flashes the engine error codes while the "D" lamp flashes the transmission error codes.
#32
Please help!
About three months ago my d4 light came on flashing, speedmeter issues, etc. It ended up being my transmission speed sensor. Now I left work and my d4 light started flashing. No other symptoms. It’s a 94 accord lx automatic 4cylinder. Still running but I’m nervous what will happen if I drive it tomorrow. What is the most likely issue?
#33
There are a lot of different items that can cause the D4 light to flash. You will need to read the transmission codes to help narrow down the problem. Copied the thread below on how to get your engine codes. All you need is a thin paperclip to short a connector to read codes. Just count the D4 flashes instead of the check engine light flashes to get the transmission code.
https://www.hondaaccordforum.com/for...l-codes-35962/
https://www.hondaaccordforum.com/for...l-codes-35962/
#34
D4 code-14 means the ECU is not responding to the TCU. The CEL light should be on solid which indicates the ECU computer is not functional. You can confirm that by shorting the SCS plug. A running ECU should output the codes on CEL or turn off CEL if no code is stored.
Two common causes of ECU failures are: 1) bad capacitors, and 2) faulty barometer inside the ECU. Capacitors replacement is quite easy to do but not the faulty barometer. Honda uses a custom barometer by Motorola which has gone out of business. The Motorola barometer was not designed to last 20 year. Getting an identical used ECU from junk yard likely will have the same issue. You may have to find a late model ECU for parts.
Two common causes of ECU failures are: 1) bad capacitors, and 2) faulty barometer inside the ECU. Capacitors replacement is quite easy to do but not the faulty barometer. Honda uses a custom barometer by Motorola which has gone out of business. The Motorola barometer was not designed to last 20 year. Getting an identical used ECU from junk yard likely will have the same issue. You may have to find a late model ECU for parts.
#35
D4 code-14 means the ECU is not responding to the TCU. The CEL light should be on solid which indicates the ECU computer is not functional. You can confirm that by shorting the SCS plug. A running ECU should output the codes on CEL or turn off CEL if no code is stored.
Two common causes of ECU failures are: 1) bad capacitors, and 2) faulty barometer inside the ECU. Capacitors replacement is quite easy to do but not the faulty barometer. Honda uses a custom barometer by Motorola which has gone out of business. The Motorola barometer was not designed to last 20 year. Getting an identical used ECU from junk yard likely will have the same issue. You may have to find a late model ECU for parts.
Two common causes of ECU failures are: 1) bad capacitors, and 2) faulty barometer inside the ECU. Capacitors replacement is quite easy to do but not the faulty barometer. Honda uses a custom barometer by Motorola which has gone out of business. The Motorola barometer was not designed to last 20 year. Getting an identical used ECU from junk yard likely will have the same issue. You may have to find a late model ECU for parts.
#37
Thank You. I was close enough then.
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