Printable View
Today I discovered my ek4 (b16a2) is for some reason running a p73-003 ecu from a b18c, which would possibly explain the late vtec engagement point and bad fuel consumption. From what I understand the stock and proper ecu for b16a2 is p30? I can't find this ecu for sale anywhere, I have a spoon pw0 and stock pw0 ecu from ef9 (jdm b16a), can I use these at all or will it not work with the b16a2 distributor? Does anyone know where I can buy a p30 ecu or what other options do I have?
Thanks
P30 is for an obd1 b16a/2 such as crx delsol and eg6 civic
Ek4 uses p2t stock
Thanks.. I will see if I have any better luck finding p2t
Finding lots for sale :) however there are a few variations, is p2t-003 the right one?
you need one from a EK4 and not a EM1
So does the code from EM1 and EK4 ecu's differ so I know which is which?
By looking at the ECU connectors
You will then need to pair the ECU to the cars immobiliser.
Another option is converting to OBDI and running an ECU that is socketed and a P30 chip
How hard is it to pair the ECU to the immobiliser? Will try to google some of this.. also forgot to mention I found this on my p73 ecu and wondered who ECU-MAN was lol Attachment 27979
Sorry, cleared now
To pair the immobiliser do I just have to swap the immobiliser chips between the two ECU's? Seems the easiest option
That will work
Immobiliser chip may not even be in the P73-003 - I believe that's a JDM ECU which never came factory fitted with an immobiliser
gotta open it up and see - i'm more interested in knowing whats been done to the ecu ECU-MAN ;)
If you need a p2t ECU let me know, have one from my b16a2 ek4
Probably a repair. There is not a lot you can do the OBDIIA ECU.Quote:
Originally Posted by dorikin
Ended up buying a P30 ecu and now my check engine light is on, vtec not engaging lol... anyone know why this could be? Might have to get that p2t ecu off you kennee..
Is throwing code 22 VTEC pressure valve
reason is because OBD1 ECU's and Engines have a VTEC Pressure switch
OBD2A engines like your EK4 don't have it
IIRC there is a so-called bypass method, you'll have to look it up tho as I don't remember how its done
Okay, makes sense, thanks. But from what I can see in the engine bay it looks like it does have a vtec pressure switch? I can take the plug off and there's oil inside.. Same on my obd0 b16a in my ef9..
post a pic of your EK4 vtec solenoid
Nevermind, I was looking at the plug lower down, here's a pic just to be sure anyway Attachment 28044
Found a few tutorials on making the ecu bypass it will give it a go tomorrow
lower one is ECT sensor
http://i51.photobucket.com/albums/f3...s/Capture2.png
vtec pressure switch looks like this
http://i51.photobucket.com/albums/f3...r318is/ECT.jpg
Jumped 2 wires on the ecu plugs to bypass it looking for the vtec pressure switch and everything works now, should have done this years ago, such a difference compared to the p73 ecu! The car finally feels good to drive just like my ef9, vtec engages earlier, way more drive-able now, thanks guys
don't jumper the wires of the VTP as you will get the code again when you hit VTEC, you can jumper VTP to VTS to get rid of the code
I thinks that what I have done, no code when vtec engages, just did exactly what it says here, Attachment 28060
thats fine
So since fitting this ecu I am only getting about 250k's from a full tank.. the car is driven hard all the time either at the track or in the hills but with the p73 ecu I was still getting about 400 a tank.. maybe my o2 sensor is just bad?
Isn't the CRX Del Sol obd2?Quote:
Originally Posted by dorikin
obd1.Quote:
Originally Posted by blaze
They come in both flavours, OBDI until 1995 and OBDIIA post 1996Quote:
Originally Posted by Blaze
Off topic, but, my CRX build date is May 96, so that would be OBDIIA? Did they bring in the OBDIIAs on and after Jan 1 or sometime mid year?
I don't know where to look for that information and I'm afraid of ripping up the carpet in the car to have a look at the ECU.
dont be afraidQuote:
Originally Posted by Blaze
If its OBDIIA it will have the factory Immobiliser. The MAP sensor will be mounted on throttle body and the IAT in the intake runner tubing. OBDI MAP is on the firewall, IAT mounted on the intake manifold and no factory immobiliser (green key on the cluster)
Also OBDII had all black interior and not the two tone door trims.
Definitely OBDIIA then...thanks for the info.
I decided to try a p2t to see if it would fix my fuel economy and bad idling and other minor issues. It wont start with this ecu, I'm assuming its the immobiliser, starter motor works but engine doesn't start. Do I need to swap the immobiliser chips between either the previous p73 or p30 that were working? Do these ecu's have immobiliser chips like the p2t has? Thanks
If the ECU is OBDIIA then the DIY on this site will show you how to bypass the immobiliser
Thanks, I'll search for it