General Tech Help Good at troubleshooting? Have a non specific issue? Discuss general tech topics here.

94 Honda Accord LX D4 Light Blinking

  #31  
Old 03-10-2017, 04:09 PM
JimBlake's Avatar
Super Moderator
Join Date: May 2006
Location: Wisconsin
Posts: 17,421
Default

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  
Old 10-21-2018, 08:21 PM
Join Date: Oct 2018
Posts: 1
Default 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. Itís a 94 accord lx automatic 4cylinder. Still running but Iím nervous what will happen if I drive it tomorrow. What is the most likely issue?
 
  #33  
Old 10-21-2018, 08:51 PM
Super Moderator
Join Date: Sep 2006
Location: Houston, TX
Posts: 13,052
Default

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/
 
  #34  
Old 05-14-2019, 12:12 AM
Join Date: Apr 2013
Posts: 1
Default

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.
 
  #35  
Old 05-14-2019, 02:26 PM
Been Around A Long Time Member
Join Date: Feb 2016
Location: Kimball MI
Posts: 961
Default

Originally Posted by ciera_87 View Post
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.
I thought 94's had both a TCU and ECU. I thought it was in 96 Honda combined them.
 
  #36  
Old 05-14-2019, 06:09 PM
Super Moderator
Join Date: Sep 2006
Location: Houston, TX
Posts: 13,052
Default

4-cylinder Accords had ECU & TCUs through 95, and switched to PCMs and OBD2 in 96. The 95 V6 was the first year for the V6 and had a PCM with OBD2.
 
  #37  
Old 05-15-2019, 03:08 PM
Been Around A Long Time Member
Join Date: Feb 2016
Location: Kimball MI
Posts: 961
Default

Originally Posted by PAhonda View Post
4-cylinder Accords had ECU & TCUs through 95, and switched to PCMs and OBD2 in 96. The 95 V6 was the first year for the V6 and had a PCM with OBD2.
Thank You. I was close enough then.
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
dixiechevy01
General Tech Help
8
06-01-2013 10:18 AM
jordanian2
General Tech Help
3
06-02-2012 12:11 PM
horsebird
General Tech Help
2
12-18-2011 10:44 AM
macappetto
General Tech Help
5
08-25-2011 07:30 AM
land shark
General Tech Help
10
05-02-2006 07:42 PM


Thread Tools
Search this Thread
Quick Reply: 94 Honda Accord LX D4 Light Blinking


Advertising

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.