obuhmyuh

code 21 on a jdm d15b, im using the VTEC spool solenoid from my d16a (sohc vtec) motor, is the solenoid model specific or do all d-series motors use the same solenoid?

obuhmyuh

bump

ifIexplode

Theyre all the same.

obuhmyuh

thought so... just can't get rid of this code... but im 55% sure VTEC is working haha.

ifIexplode

it either works or it doesnt. There isnt any Half VTEC.
Try cleaning the screen in the solenoid

obuhmyuh

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ifIexplode &raquo;</TD></TR><TR><TD CLASS="quote">it either works or it doesnt. There isnt any Half VTEC.
Try cleaning the screen in the solenoid</TD></TR></TABLE>
yeah i know but i have sohc VTEC and its less noticeable.

i did, looks clean, still getting a code. reset ecu too. could it be an ecu issue?

JDM Knight Star

check the code. if sohc engages you can hear it if you have an intake or an exhaust. Its kinda hard to tell on the stock filter. lol.

ifIexplode

Actually, With an Exhuast on a SOHC VTEC motor it will only drown out the Crossover, Only because the cam is on the Intake side. Not the exhaust side.

Check for crimps in any wires.
Could be the solenoid itself, But that rarely happens. See if you can find someone with an ECU you can borrow.

obuhmyuh

i have 3 ecus one of them blew up, ill try the other one. i have CAI and headers back exhaust. i tried 2 different solenoids. the wires are a little jack by my ecu tho but i thought i fixed them.

ifIexplode

It may very well be not pushed into the PIns all the way in the connector on your ECU plugs.

obuhmyuh

good idea! im gonna try that now.

ifIexplode

report back when you get a chance.

obuhmyuh

fiddled with it for a bit... i can see a little bit of the gold wires at the base of the VTEC wire, which im 99% sure its the orange wire with a white stripe... where can i but a new ecu harness? but i still think it might be my chipped ecu causing the code...

obuhmyuh

is it possible for your VTEC to work with a code 21?

ifIexplode

No VTEC wont work with that code.
I cant see you needing a new harness.

What year is your car?
Easiest way i think to find the solenoid wire at the ECU is to look at the VTEC pinout digrams.

try a virgin ECU.

obuhmyuh

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ifIexplode &raquo;</TD></TR><TR><TD CLASS="quote">No VTEC wont work with that code.
I cant see you needing a new harness.

What year is your car?
Easiest way i think to find the solenoid wire at the ECU is to look at the VTEC pinout digrams.

try a virgin ECU. </TD></TR></TABLE>

1995... obd1 my virgin ecu is the one that blew up, all of have left is my chipped ecu and my pr3

Mattb16teg

Post up when you figure out your problem. I am having the same problem now. It threw code 21, I cleared it but now Vtec will not engage

obuhmyuh

i cant clear my code but my VTEC works, wtf. haha

Mattb16teg

wow talk about backwards!
Here's my thread:

https://honda-tech.com/zerothread?id=2273399

Mattb16teg

If it helps my problem turned out to be wiring. Harness had a few bad connections.

obuhmyuh

thanks dooood, i think my prob is my ecu's im using, im using a chipped p06 and a pr3 ecu so they might be a lil funny.

why do u want the mods to delete the thread? maybe itll help someone in the same situation as us. and i know u prob tried to search for code 21 but "21" is too short so people will search by "VTEC SPOOL SOLENOID" and our threads will pop up

good job on the fix btw