Honda Civic / Del Sol (1992 - 2000) EG/EH/EJ/EK/EM1 Discussion

Strange code 0 CEL

 
Old 05-21-2019, 09:20 AM
  #1  
Honda-Tech Member
Thread Starter
 
Join Date: Nov 2018
Posts: 23
Likes: 0
Received 0 Likes on 0 Posts
Default Strange code 0 CEL

Recently I finished my obd 2a b18b1 swap into my 1998 ek (using jumper harness to convert to obd1) and now am stuck with a check engine light I am unable to fix. I'm not 100% sure if my swap caused this CEL since the previous owner had removed the bulb, but my car runs fine and doesn't have any of the major issues people with a code 0 seem to have (car won't start or they are in some sort of limp mode). I have read pretty much every code 0 thread on honda-tech now but haven't been able to find a solution . Most of the fixes people seem to come across are a bad ECU, poor thermostat ground, main relay, some short in the wires, etc.

One of my friends suggested it could be due to the SiR cluster swap that was done but I couldnt find any more info on that. If anyone has any tips it would be much appreciated

Thanks
FourthGen is offline  
Old 05-21-2019, 09:49 AM
  #2  
Honda-Tech Member
 
Join Date: Feb 2016
Posts: 2,814
Likes: 0
Received 5 Likes on 4 Posts
Default Re: Strange code 0 CEL

With the test jumper out--
CEL should come on then go out when you turn the key on but don't crank.
CEL should stay off while running unless there is a currently active code-- then it is on steady.
With the test jumper in--
CEL should come on and stay on steady when you turn key on or start the engine, if there are no codes.
Or, CEL should blink out codes if there are codes.

If the memory back up circuit is not working (BACK UP fuse under the hood feeding constant power to the ECU on the white and blue wire), the ECU will not remember codes with the key off. If the CEL comes on while running, indicating a code, you can check by putting the test jumper in without turning the key off.
mk378 is offline  
Old 05-21-2019, 10:11 AM
  #3  
Honda-Tech Member
Thread Starter
 
Join Date: Nov 2018
Posts: 23
Likes: 0
Received 0 Likes on 0 Posts
Default Re: Strange code 0 CEL

With the test jumper out my CEL turns on and stays on when the key is turned and while the vehicle is running (even after resetting the ECU).

When I jump the service connector, the CEL brightens and stays steady which indicates a code 0 (from what I've read).

I'm fairly certain the memory back up circuit is functioning because the ECU seems to store this "code 0"
FourthGen is offline  
Old 05-21-2019, 10:23 AM
  #4  
Honda-Tech Member
 
tony_2018's Avatar
 
Join Date: Nov 2005
Location: Austin, Tx
Posts: 12,887
Received 13 Likes on 10 Posts
Default Re: Strange code 0 CEL

What ecu?
tony_2018 is offline  
Old 05-21-2019, 10:33 AM
  #5  
Honda-Tech Member
Thread Starter
 
Join Date: Nov 2018
Posts: 23
Likes: 0
Received 0 Likes on 0 Posts
Default Re: Strange code 0 CEL

Obd1 p75
FourthGen is offline  
Old 05-21-2019, 03:43 PM
  #6  
Honda-Tech Member
 
muellersfan's Avatar
 
Join Date: Apr 2018
Posts: 1,016
Received 15 Likes on 15 Posts
Default Re: Strange code 0 CEL

Start by testing whether fuse 44 or 13 is blown. Test with a multimeter. Visual inspection is unreliable.
muellersfan is offline  
Old 05-21-2019, 03:56 PM
  #7  
Honda-Tech Member
Thread Starter
 
Join Date: Nov 2018
Posts: 23
Likes: 0
Received 0 Likes on 0 Posts
Default Re: Strange code 0 CEL

Just checked those, both are still in good condition and are working
FourthGen is offline  
Old 05-21-2019, 04:01 PM
  #8  
Honda-Tech Member
 
muellersfan's Avatar
 
Join Date: Apr 2018
Posts: 1,016
Received 15 Likes on 15 Posts
Default Re: Strange code 0 CEL

Originally Posted by FourthGen View Post
Just checked those, both are still in good condition and are working
Does 44 get constant voltage?

Does 13 get voltage with key in ON(II)?
muellersfan is offline  
Old 05-22-2019, 06:40 PM
  #9  
Honda-Tech Member
 
Join Date: Jan 2013
Location: The South - Roll Tide !!!
Posts: 3,459
Likes: 0
Received 0 Likes on 0 Posts
Default Re: Strange code 0 CEL

Try another ECU.
JRCivic1 is offline  
Old 05-22-2019, 07:16 PM
  #10  
Honda-Tech Member
 
tony_2018's Avatar
 
Join Date: Nov 2005
Location: Austin, Tx
Posts: 12,887
Received 13 Likes on 10 Posts
Default Re: Strange code 0 CEL

locate obd1 p75 or an obd2a p75
tony_2018 is offline  
Old 05-22-2019, 07:28 PM
  #11  
Honda-Tech Member
 
muellersfan's Avatar
 
Join Date: Apr 2018
Posts: 1,016
Received 15 Likes on 15 Posts
Default Re: Strange code 0 CEL

Haha...just read first post and found that the car starts and runs fine.

1) Use a multimeter to check for a short to ground in the CEL wire that runs between the cluster and ECU.

2) Use a multimeter to check for a short to ground in the Brn wire that runs from the service connector to the ECU.

Last edited by muellersfan; 05-22-2019 at 07:49 PM.
muellersfan is offline  
Old 05-26-2019, 12:02 PM
  #12  
Honda-Tech Member
Thread Starter
 
Join Date: Nov 2018
Posts: 23
Likes: 0
Received 0 Likes on 0 Posts
Default Re: Strange code 0 CEL



Originally Posted by muellersfan View Post
Haha...just read first post and found that the car starts and runs fine.

1) Use a multimeter to check for a short to ground in the CEL wire that runs between the cluster and ECU.

2) Use a multimeter to check for a short to ground in the Brn wire that runs from the service connector to the ECU.
I confirmed there was no short between the cluster and ECU.

This was the brown wire I checked (plugged into a brand new obd2a to obd1 yonaka jumper harness).

I believe this wire may be shorted as I was only getting a reading of around 0.01 ohms. Would it be the culprit? When I tested the resistance between the black and brown service connector wires there was no short.

Just a little confused since if that brown wire going to the ECU was shorted, shouldn't I be getting the same reading from putting my probes in the service connector?
FourthGen is offline  
Old 05-26-2019, 04:50 PM
  #13  
Honda-Tech Member
 
muellersfan's Avatar
 
Join Date: Apr 2018
Posts: 1,016
Received 15 Likes on 15 Posts
Default Re: Strange code 0 CEL

Originally Posted by FourthGen View Post
I believe this wire may be shorted as I was only getting a reading of around 0.01 ohms. Would it be the culprit? When I tested the resistance between the black and brown service connector wires there was no short.

Just a little confused since if that brown wire going to the ECU was shorted, shouldn't I be getting the same reading from putting my probes in the service connector?
The Brn wire has a short to ground. One possibility is that the Blk wire lacks proper continuity to body ground. Check that now.
muellersfan is offline  
Old 06-03-2019, 04:29 PM
  #14  
Honda-Tech Member
Thread Starter
 
Join Date: Nov 2018
Posts: 23
Likes: 0
Received 0 Likes on 0 Posts
Default Re: Strange code 0 CEL

Originally Posted by muellersfan View Post
The Brn wire has a short to ground. One possibility is that the Blk wire lacks proper continuity to body ground. Check that now.
Sorry for the delay, been pretty busy with work and havent had time to do some more diagnosis. Anyways, I just confirmed that the black wire is a good ground. Where would I begin when trying to fix the short in the brown wire?

Also, wouldn't the cel always be bright instead of dim since the scs connector is basically being always "jumped" (due to the accidental short)
FourthGen is offline  
Old 06-03-2019, 05:13 PM
  #15  
Honda-Tech Member
 
muellersfan's Avatar
 
Join Date: Apr 2018
Posts: 1,016
Received 15 Likes on 15 Posts
Default Re: Strange code 0 CEL

Originally Posted by FourthGen View Post
Also, wouldn't the cel always be bright instead of dim since the scs connector is basically being always "jumped" (due to the accidental short)
Have you ever mentioned this^ in your thread? Please provide more details.
muellersfan is offline  
Old 06-03-2019, 05:21 PM
  #16  
Honda-Tech Member
Thread Starter
 
Join Date: Nov 2018
Posts: 23
Likes: 0
Received 0 Likes on 0 Posts
Default Re: Strange code 0 CEL

Originally Posted by muellersfan View Post
Have you ever mentioned this^ in your thread? Please provide more details.
Originally Posted by FourthGen View Post
With the test jumper out my CEL turns on and stays on when the key is turned and while the vehicle is running (even after resetting the ECU).

When I jump the service connector, the CEL brightens and stays steady which indicates a code 0 (from what I've read).

I'm fairly certain the memory back up circuit is functioning because the ECU seems to store this "code 0"
Earlier I described how I have been attempting to pull CEL codes and why I believe it is a code 0.

I was just confused since we pull codes by shorting the service connector but it sounds like my brown wire has been (and still is) shorted
FourthGen is offline  
Old 06-03-2019, 05:25 PM
  #17  
Honda-Tech Member
 
muellersfan's Avatar
 
Join Date: Apr 2018
Posts: 1,016
Received 15 Likes on 15 Posts
Default Re: Strange code 0 CEL

Oh, okay. The wire running between the CEL bulb and ECU is clearly bad. Run a new wire to bring back your smile.
muellersfan is offline  
Old 06-16-2019, 01:25 PM
  #18  
Honda-Tech Member
Thread Starter
 
Join Date: Nov 2018
Posts: 23
Likes: 0
Received 0 Likes on 0 Posts
Default Re: Strange code 0 CEL

Just ran a new wire from the cluster to ecu (green/orange stripe), unfortunately the cel persists
FourthGen is offline  
 


Thread Tools
Search this Thread

Contact Us - About 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.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: