n*werk

car is a 97 civic dx hatchback... swap obd1 gsr

i am using a 98 civic EX harness and running a OBD2a to OBD1 jumper p28 chip ecu

when i turn the car to ON position the check engine will come on and stay on.. usually it dissappear after 2 sec but it just stay on... jump the code and it blink one long over and over i counted up to 19 timies, i was thinking code 10 maybe, checked my IAT but its seem to be fine... then i thought CODE 20?? regrounded the ELD wire, same thing.... checked the main engine harness wire, connected to the thermostat and ran a wire stragiht to the battery NEG. no luck... did some research and people was saying the ecu wasn't grounded good enough?? so i grounded the ecu wire i belive it was B24? no luck... i try swapping out ecu to another p28 chip but does the same thing...

then i was thinking, maybe my jumper harness is bad, so i used another one from my buddy and i still get the check engine light and it stay on...

then i use a obd2a gsr ecu, check engine light came on the off like normal then it came back on, but i check the code and it was the same code as before, i know for a fact that i should get more code then that, ex: knock sensor, O2 etc etc etc....

the only thing i haven't tried is swapping the engine harness out to another Ex harness... but the 96-98 Ex harness is hard to find and expensive if you find one, so i am trying to avoid that route because my car still run but fill weak...

any suggestion would be great!!!

Jimster480

if you have OBD1 then there is no knock sensor.
get a scanner and plug it in and read the code?

n*werk

i should get a check engine light for knock sensor using obd2 gsr ecu... why do i need a scanner when i can just jump the code from the two wire by the ecu? Bump cause i need some idea..

n*werk

bump

n*werk

anyone

turbojdmhatch

u try the ecu code and how to sticky?

n*werk

i did all the step in the manual... i am getting 5 volt and IAT sensor been swapped out for a Known GOOD ONE .. any IDEA???

turbojdmhatch

20 Electrical load detector

thats code 20 seeings how you thought it might have been code 20 or 10...did you search any of these codes on how to fix any of them?

n*werk

code 20 ELD.. i follow the same set in the manual... i took the all black (ground wire) ran it to the battery, and no help.. same thing ( so i unhook the ground wire from the ELD)

thanks, any more IDEA!!??

turbojdmhatch

have u reset the ecu and tried to see if it comes back on after all of that?

RagnarX

If its code 20 check/clean all your grounds and the battery terminals. I had it awhile back and it fixed the problem. Hopefully its just something as simple as this.

turbojdmhatch

yea while u check all of them touch the 2 battery terminals together for 10+ seconds to reset the ecu so there will not be any codes when u start it back up...and no not the terminals on the battery itself you will just blow up your battery (you dont understand how many times i have to tell people that)

RagnarX

^and do that too...

n*werk

tried that also.. didn't work... pulled the 15ecu and 7.5 fuse, didn't work either..

i own a shop do mechanical work and wiring work for years now (just to let you knoe that i am not a nooB), but this is one of those you will get stomp on... can't figure this one out.. HELP!!

n*werk

which one.. more specific please..

RagnarX

Did u check the grounds or battery terminals? If so and its still not fixed after resetting the ECU, im curious to see what else it could be.

turbojdmhatch

we are trying to help you out haha....idk i give up its too late and after working 9 hours today and then working on my car i dont feel like mentally picturing someone elses car and what could be wrong with it...i do that at work too much....check all wiring is all i can say

n*werk

i triple check all my grounds, i also thought it could be a ground issue so i took a FAT WIRE and ran one wire to the battery NEG and ran it straight to the main ground on the harness (by the thermostat) still check engine light..

n*werk

thanks for the help..!!!

ifIexplode

Scan tools wont work when there is a jumper harness. FYI

n*werk

o..... ok... tell me something that might help me solve this problem...

RagnarX

by checking i mean cleaning off the corrosion and such, i hope you understood. Mine didnt look that bad but after a little cleaning that did the trick. It could also be some aftermarket wiring shorting out or whatnot, ie deck, speakers, amps,. possibly alarm or peripheral gauges of some sort.

Wiring is a bitch, i've been through a few problems myself due to improper installs. Sorry if im not being much help, hope you figure this out.

n*werk

o... yea..no corrsion on my terminals... but looking for some suggestion

Mr. EF

same here and i have a customer that has a sh**ty issue flashing code 20 no idea how to troubleshoot it

Jimster480

orlly, didnt know that :/