I recently switched over to an OBD1 ecu because I will be going with hondata again soon in the future. (2000 cx hatch, 2000 b18c1, 2000 GSR ECU now OBD1 p72)

It seems that now at night I notice a dimming of my interior lights, and headlights at times.

Then for a while the lights will go back to the old brightness, and then back dim again. It seems like it could be throttle or rpm dependent, but I can't tell for sure. Seems more random to me.

I don't remember this with the OBD2b ecu. Is there something with the ELD or some difference between the OBD1 and obd2 ecu that could be causing this? I thought I remember reading someone saying you need to disconnect something from the alternator when switching to OBD1 and hondata?

I also get a strange idle that goes up and down until the car is fully warmed up.

Any advice would be appreciated.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by HXMan &raquo;</TD></TR><TR><TD CLASS="quote"> Is there something with the ELD or some difference between the OBD1 and obd2 ecu that could be causing this? I thought I remember reading someone saying you need to disconnect something from the alternator when switching to OBD1 and hondata?
</TD></TR></TABLE>

yeap, poor conversion harness's can cause this situation. Its not a big deal, just the eld freaking out.

 

You know of any fix to this? Replacing a wire in the adaptor harness perhaps?

 

i did the same swap and didnt have that problem....however i did need to change my ground on my IAB to a constant....

 

I had this problem when i went to hondata, Let me dig up my fix,

Actually what happens is the alternator turns off and on, I had a homemade harness and I tried a skunk2 harness, no difference, I had to cut a Wire to the alternator

Stay tuned and ill post the how to fix directions

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by HXMan &raquo;</TD></TR><TR><TD CLASS="quote">I recently switched over to an OBD1 ecu because I will be going with hondata again soon in the future. (2000 cx hatch, 2000 b18c1, 2000 GSR ECU now OBD1 p72)

I also get a strange idle that goes up and down until the car is fully warmed up.

Any advice would be appreciated. </TD></TR></TABLE>

I just swapped in a p72 OBD I ECU in my gsr and i also have the idle problem sometimes. It will idel so low sometimes that the car will turn off right away. I would also like to know what could cause this problem.

 

Ok, for the people who have the "power fluctuation" try disconnecting the alt c wire. By simply cutting it on the harness for me, fixed the problem altogether. Try at your own risk, make sure you figure out which wire alt c is. Ill try to give u guys more info later, but now im at a group meeting (and slacking )

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mase &raquo;</TD></TR><TR><TD CLASS="quote">I had this problem when i went to hondata, Let me dig up my fix,

Actually what happens is thetried a skunk2 harness, no difference, I had to cut a Wire to the alternator

Stay tuned and ill post the how to fix directions </TD></TR></TABLE>

Cool!!!

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by MwGSR &raquo;</TD></TR><TR><TD CLASS="quote">

I just swapped in a p72 OBD I ECU in my gsr and i also have the idle problem sometimes. It will idel so low sometimes that the car will turn off right away. I would also like to know what could cause this problem.</TD></TR></TABLE>

I have had this problem twice. Each time it happened I drove a short distance from work, and filled the car up with gas. I would start the car and it would idle super LOW, and would kill unless I kept the rpms up with the gas pedal. 2nd time was yesterday infact.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mase &raquo;</TD></TR><TR><TD CLASS="quote">Ok, for the people who have the "power fluctuation" try disconnecting the alt c wire. By simply cutting it on the harness for me, fixed the problem altogether. Try at your own risk, make sure you figure out which wire alt c is. Ill try to give u guys more info later, but now im at a group meeting (and slacking ) </TD></TR></TABLE>

Curious about what you mean by "alternator C" wire?

 

i believe there are two alternator signal wires connected to the ecu, one is alt f and one alt c. when i disconnected alt c wire, the problem went away for good.

I will dig up the pin location when i get home.

basically, on my car, 50% of the time when i was idling, the alternator would be off, and voltage would read 12 v, then when i would accelerate or if i was over like 3000 rpms, the alternator would kick back on and read 14 v.

 

Yea, that sounds alot like what I am experiencing.

 

with Hondata, you can disable ELD within the program, solves the issue with no wire cutting

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by VaporTrail &raquo;</TD></TR><TR><TD CLASS="quote">with Hondata, you can disable ELD within the program, solves the issue with no wire cutting</TD></TR></TABLE>

haha, too bad you and I didnt figure that out when I had hondata, eh john?

 

I got this same power fluctuation when i converted to OBD1 and i'd love to fix it...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mase &raquo;</TD></TR><TR><TD CLASS="quote">

haha, too bad you and I didnt figure that out when I had hondata, eh john?</TD></TR></TABLE>

on version 2.5 there was no option to disable the ELD. Your experience with your harness and other's like it lead Hondata to disabling it to improve functionality

 

Wow...didn't think so many people had this problem. Guess I'm not the only one.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by VaporTrail &raquo;</TD></TR><TR><TD CLASS="quote">with Hondata, you can disable ELD within the program, solves the issue with no wire cutting</TD></TR></TABLE>

WOW, I am having this issue ever since Hondata and I had no idea how to fix it except cut the harness wire. What is ELD anyway?

I just opened my rom and clicked the checkbox for Disable ELD. Saweet!!!

Thanks John,

Brad

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by HXMan &raquo;</TD></TR><TR><TD CLASS="quote">Wow...didn't think so many people had this problem. Guess I'm not the only one. </TD></TR></TABLE>

haha, same here. I would've posted about this same problem a while ago, but i thought it was just me b/c of my chip, ECU, or something.

 

ok i looked it up, and i believe alt c is pin a16.

If anyone tries it, let me know how it goes,

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mase &raquo;</TD></TR><TR><TD CLASS="quote">ok i looked it up, and i believe alt c is pin a16.

If anyone tries it, let me know how it goes, </TD></TR></TABLE>

Mase, you running version 2.5 then?

 

i got the same problem.....gonna try cutting that wire.

 

i used to run 2.5 back in the day, i then sold that turbo setup, bought a new setup and used the AEM EMS.

that car got stolen,

I drive a stock car now

 

marking......just in case i run into this too

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by B18Flip &raquo;</TD></TR><TR><TD CLASS="quote">marking......just in case i run into this too </TD></TR></TABLE>
me 2

 

So any update on if cutting the wire worked?