joes-92

hey all,

owned the hatch for about a month now. it was a 92 auto vx. the last owner swapped a d15b7 manual in it. it was running ok with some weird ecu in it before, but i swapped ecu and it now runs like total crap. the car studders and hesitates badly. the gears seem different too, i am having to shift a whole lot sooner now.

before the swap, i rewired the map sensor to clear a cel from the old ecu, leaving me with a vtec cel. now the vtec code is gone and the map code is back.

do i need to reset the ecu to learn the car?

any guidance is greatly appreciated.

old ecu:



new ecu:

grumblemarc

iTrader: (4)

So put the old ECU back in it. Why did you swap it out if it ran okay?

joes-92

i was in the process of getting the car back to factory specs and it only ran "okay." the previous owner took a ton of shortcuts. i also wanted to be able to drive without the vtec cel. i figured i would run it with the ecu that was meant for the motor.

would running the vtec ecu without a vtec make it run funny? what happens when its time for vtec to kick in and its not there?

grumblemarc

iTrader: (4)

This ECU obviously has different shift points since it's an automatic.

What ECU was in it before? Exactly? That sticker tells me nothing.

joes-92

funny thing that old ecu...no other stickers on it. i even checked under the sticker.

grumblemarc

iTrader: (4)

Put it back in. If it throws a code post it up.

joes-92

roger, be back in 5.

joes-92

ok, two codes with old ecu back in:
3- map
21- vtec solenoid

the code 3 went away when i rewired the map sensor before. what would cause it to trip with the old one back in?

may be a dumb question. anything special when swapping a ecu? i just plugged and played.

grumblemarc

iTrader: (4)

B7s aren't VTEC are they?

JuggerNaut-CTR

So the car is manual now?

Is that a p06 intended for a auto b7?

joes-92

manual now, def not vtec.

found this:
https://honda-tech.com/forums/honda-civic-del-sol-1992-2000-1/ecu-d15b7-3123521/

grumblemarc

iTrader: (4)

That's why it's throwing a code for VTEC. It's looking for it and it isn't there. Don't worry about that. Is the MAP sensor bad? But It's NOT automatic? Shouldn't make any difference as far as shifting goes.

joes-92

5 speed now. it was working before the swap. ill have to go buy one. i dont know to many honda guys around here. i have a voltmeter, but dont really know how to use it.

another piece of the puzzle, when i put in the p06, the cluster lights went out. i smacked the dash and they came back on.

joes-92

update: left the old ecu in it and drove it about 10 miles to get my tint done. while i was waiting for my car to go back i pulled the codes again. now, the vtec code is gone and i am throwing codes for the map sensor(code 3) and an o2 sensor code(41). i went ahead and forked out $60 on a new map and the jerkoffs at autozone told me to take the car to a certified mechanic because i asked them about code 41 while i was there. they provided no help whatsoever.

on a better note, i got the wifes journey(front 2 windows) and the whole hatch done with 20% all around for $120! they did a damn good job and even though its illegal, they still gave me the lifetime warranty!

joes-92

from what i have seen of the previous owners "work" and the ecu problems i have, i am left wondering what harness i have. the original vx or the b7 harness? any easy way to tell?

Toofpik

Dude dont hate the guys at the autoparts for not helping u. I hate it when people walk in my store thinking they own me just becuz i work at an autoparts store. Understand that neither u or their employer is gonna pay them to diagnose an o2 code (nor do they have the tools to do so). Anyway, many things can trip an o2 sensor code. Check if its unplugged, loose, broken or missing (get used to using common sense, trust me its awesome). If its good then ur gonna have to do more trouble shooting.

zombiehuntr

Yeah, like toofpik said. use common sense. I'm sure its not all, but the majority of people that work at autoparts stores from what I've seen have retail experience but very little if any automotive repair experience. there are those few though that know their ****. Rely on your common sense like he said, and also, HONDA-TECH! lol.....

joes-92

ok youre right, i was being quite harsh on them. i was mostly upset with the manner they handled my question. i miss the good ole south where i could rely on any of the major chains to help.

i had checked the wires before i went up there, all was connected. currently doing research on the correct o2 needed and what wiring i have.

Former User

Leave the P06 ECU in your car. That's the right one. Your car will run better when you fix code 3. Does you D15b7 engine have the MAP sensor on the throttle body? If so, make sure your MAP sensor there is plugged in and the wires are properly pinned to the ECU.

joes-92

fixed the map myself, wht to wht, yel/red to yel/grn and grn/wht to grn/blue.
this cleared the cel from the old ecu, but tripped it when i put the p06 on. it also showed up when i put the old ecu back in.

the tb i have doesnt have a mount for the map, so i have it zip tied to my strut bar with a vac hose connected to the nipple on the tb. i havent put on the new map yet as it is late here and my car is loud(tight quarters here).

last, how are codes stored? do i need to reset the p06 when i plug it back in to clear the old codes?

thanks again everyone for the help

HondaPartsHero

First off there was no Auto VX available that I know of, so either it's not a VX or it is VX and was always manual.

Secondly the VXs have a 5 wire primary 02 sensor so you'll have to convert that sensor to 4 wire unless you are using the b7 engine harness.

I'm still confused why you had to rewire the MAP sensor at all and can you post pics of your wiring?

Enter your VIN in the decoder on the top of this forum and post what the results show
https://honda-tech.com/vindecoder.php

Also to determine if its a b7 harness post some pictures arbor around the distributor area. If it's a VX harness it have a left over 3 prong plug for the EGR that wasn't used due to the b7 not having it.

joes-92

joes-92

update: put a new map sensor on and couldnt get it to turn over, cranks all day long though. its throwing a code 15 now. anyone have luck with fixing a code 15? i have to wait til the wife gets home to check the plug wires, dizzy connections and fuses.

joes-92

i am getting no spark. i was wondering if anyone can help me use my voltmeter? i am finding a lot of sources saying to test voltages and i am not sure what to set it at. pic below.

joes-92

day 3:

figured out how to use my voltmeter. battey is good and i am getting power to the distrubitor. under hood fuses are good and fuel pump is priming. tried both my ecu's and still no luck. still getting the code 15(and vtec code,understandable). i am lost at this point.

when i tested the 2p plug at the dizzy it hit 11.59 then began to decrease. is this normal? is the power supposed to remain constant?

i had purchased some 1156 silverstars and noticed last night that they were extremely dull. i am not sure if it is a clue to my problem.

any help is appreciated. thanks in advance.