hello my vtech wire on my wiring harness that connects to my ecu is slowly falling out. previous owner didn't do to well of a job on my 98 integra w/b18c5 swap. the wire goes from my vtech solenoid right to the ecu harness. I'm guessing the pin is broken possibly or who knows why. im going to replace the pin and do it right like how it should of been my car intermittently (when its already warmed up) idles high like its in warm up procedure which disables my vtech and the only way to reset this is to turn my car off then turn her back on which i guess resets everything and my rpm's go back down to normal which in-return makes my vtech work again. so this is where im starting to try and fix this problem.

alright well here is my question, is it safe to simply unplug my wire harness that connects to my ecu or will it cause problems? if it is safe is their a procedure to unpluging it? (she does have a stupid excalibur alarm)

 

You can unplug the ECU with key in off position. Same for plugging it back in.

But it sounds like you have other problems besides your VTEC solenoid wire coming out of the plug. Maybe your ECT sensor or circuit is giving your ECU bad information.

 

Disconnect the neg.(-) batt. terminal on the car anytime your doing any kind of "electrical" work and nothing can happen. 94

 

Can't argue with that. I just hate having to reprogram my presets.

 

Alright thank guys! So you're thinking i should start with the ECT senor? i mean that makes sense. anything else you can think of that could be the problem?

 

heres the photo of my ecu harness with vtech wire coming out

 

Oh yeah, that looks like dog ****. Should definitely fix that but like I said, I think your problem may be elsewhere. The connector looks a little mangled. Is it damaged? What ECU are you using?

 

That plug has ground leads on it by the looks of it, disconnecting a ground on load, [ECU/ECM] that is still powered will result in the load "looking" for another path to ground and that may be 5V reference sensors, guess what can happen when you draw 12V through a 5V circuit, you can disagree all you want, even do crap like that on your own car, because you hate reprogramming some presets.

Giving that advice to someone else.

Coopa B18c5, take my word for it, [my day job is at Dave Ward Auto Electric] it's far better to be safe then sorry. 94

 

i am a little new to the Honda world but here is a photo of it and he has it just lose under the passenger side carpet and i'm going to mount it down asap. also it doesn't look damaged to me.. i guess its obd2 but when i hook up my scan tool(like a advance auto-parts style) all i get is an error message on the screen.. just a little confused. the wiring was definitely done awfully. iv been slowly repairing wires that were connected together by just wrapping the wires together and some electrical tape. iv been repairing them soldering/shrink wrap/electrical tapping then together, but i don't know about all the wiring under the dash.. that's another day topic ha..

 

ECU ID... http://www.hondata.com/techecuid.html 94

 

Didn't disagree at all fcm, quite the opposite as we usually see eye to eye. But I did say key off, which means no power to the ECU. Yes it's a short cut and yes, you're better safe than sorry... but those damned presets.

OP: best to disconnect your negative battery cable. I don't want your dead ECU on my hands.

 

From the site you gave me its a OBD2A ECU.

And don't worry ill be sure to disconnect my negative battery ground

 

Always disconnect negative when working with anything electrical on any vehicle.