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Code 20 ELD Possible Work Around?

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Old Sep 7, 2010 | 10:58 PM
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Default Code 20 ELD Possible Work Around?

Hi guys,

I got a 93 eg civic with an obd1 h22a and p13 ecu.

After the car warms up i get a code 20 mil. When i turn the car off, the check light goes away but when the car is restarted and driven for a bit the check light comes back on. Now this had me stumped but i'm guessing the ELD gets triggered if there is a large voltage drop in the system.

So i'm guessing this is caused by my thermo fan and electric p/s setup as the two combined have quite a current draw and would explain why the check light only comes on after the car is warmed up and driven for a while. I'm also using a d series alt.

My question is, can this be worked around using the standard obd1 p13? Can the ELD circuit be removed from within the ecu?

I've read elsewhere that others cut the eld circuit resistors in the ecu for a/f logging through the eld input, but by doing this will the ecu still light up the check light?

Cheers for any help
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Old Sep 7, 2010 | 11:15 PM
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Default Re: Code 20 ELD Possible Work Around?

found some info about the eld circuit in the ecu here - https://honda-tech.com/forums/engine-management-tuning-124/code-20-eld-89-crx-obd-1-conversion-2683391/



if i clip these resistors in my ecu, will this clear the code 20 or will it permanently light up because the circuit has been broken?
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Old Sep 8, 2010 | 12:12 AM
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Default Re: Code 20 ELD Possible Work Around?

actually, just on this topic, does code 20 or 12 even alter the way the car runs in any way?

if not, i'm just thinking of wiring my engine check light to a switch so i can turn it off. That way i can just turn it on when i need to check codes . . . thoughts
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Old Sep 9, 2010 | 10:06 PM
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Default Re: Code 20 ELD Possible Work Around?

anyone?
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Old Sep 10, 2010 | 07:12 AM
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From: Big Sky Country, United States of America
Default Re: Code 20 ELD Possible Work Around?

Originally Posted by NAEGH22
actually, just on this topic, does code 20 or 12 even alter the way the car runs in any way?

if not, i'm just thinking of wiring my engine check light to a switch so i can turn it off. That way i can just turn it on when i need to check codes . . . thoughts
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Old Sep 10, 2010 | 05:34 PM
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Default Re: Code 20 ELD Possible Work Around?

after market ecu's allow the user to turn off certain ecu inputs/signals such as egr and eld so wiring a switch to my mil is another way of doing the same thing since those 2 codes don't affect driveability. As long as they are the only two codes present i don't see the harm. If i need to check for other codes i could simply flick the switch on to display what i need to see.

A ' ' isn't any help . . .

Other users are helping via pm but i figured this may help others also. I'll post my findings.
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Old Sep 11, 2010 | 05:31 AM
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From: Big Sky Country, United States of America
Default Re: Code 20 ELD Possible Work Around?

Sorry for the vague reply... I would just go to the source of the problem rather than putting a 'band-aid' on it. Have you tried checking voltage from the alternator to verify that it is putting out 13-14 volts? Make sure it is not overcharging as well as this could mean that the voltage regulator on the back side of the alternator is going bad. Another suggestion would be to install a chipped p28/p72 and disable the ELD within the tuning program (I'd still suggest fixing the problem though over this)
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Old Sep 12, 2010 | 09:14 PM
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Default Re: Code 20 ELD Possible Work Around?

i wasn't trying to band aid it, i was looking for a work around while using the oem p13 ecu as it doesn't affect driveability.

either way i found the cause. It wasn't current draw, it was due to the d series alt i picked up from the wrecking yard didn't have a eld output Only had 3 pins in the connector.

switched to a h series alt. problem solved
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