VTEC Installation

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Originally Posted by XP02ED

ok basic end summary before i test it tmz morning :

.Disconnect Negative from batter..yes to clear codes already stored in ecu,only have to do for 10-20 secs
2.Grab a bulb less than 2 watts.. connect it to A13 (ecu) for ground and a wire to somewhere for the positive endyes
3.Go for a drive trying to maximise speed or RPMIn the speed limit of course.
4.Connect a wire from D4(ecu) to ground
5. Put car On (not ignition) then see what happens with bulb?Ignition "on" is where u want the key,turn it till your oil light & battery light come on,but dont turn the engine on.
6. if the bulb doesnt flash. remove battery againif bulb stays on constant thats good news,ie no faults.

remove current setup try to work on a more permanent arrangement for this setup,to make code checks a bit easier for u,ie put a globe permanently in your dash somewhere so u can be instantly informed of engine faults & put a switch in the D4 wire with it switching onto ground to make it easier.

get a wire from where vtec connects in engine bay connect wire to positive of wire to the bulb, and ground the other end.
have a drive and see if bulb lights on to see if vtec engages!

hopefully this is right if so ill let ya know tmz what happens!

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blue bits

just run the vtec bulb from engine bay back into the cabin so u can see it while driving obviously

edit:dont forget to remove D4 from ground before u disconnect battery for the last time.

ok sweet i get it

aiight but i still dont get how A13 and D4 will signal the light bulb to flash and stuff?

is that something the ECU does?

BTW once ive set this up,
i can setup a Vtec globe aswell reading post which we talked about to see when vtec engages!

what im gna do to minimise wiring right,

Connect A13 and to A23/A24 to ground it, Positive end of the bulb t D1
Connect D4 to A23/A24 as well to ground it (i might put a switch between).

BTW going by this layout :

http://www.ff-squad.com/tech/wiring/obd1.ecu-pinout.zip
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once this is setup ill make a kool setup to blink stuff when vtec engages ;D

Quote:

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Originally Posted by XP02ED

ok sweet i get it

aiight but i still dont get how A13 and D4 will signal the light bulb to flash and stuff?

is that something the ECU does?

BTW once ive set this up,
i can setup a Vtec globe aswell reading post which we talked about to see when vtec engages!

what im gna do to minimise wiring right,

Connect A13 and to A23/A24 to ground it, Positive end of the bulb t D1
Connect A13 to one end of the globe only,not to A23/A24.Connect the other end of the globe to a power source like the other examples ive given above.If u connect it to D1, this is a permanent supply off the battery & I'm not sure,but it is possible that the ecu might not release the A13 contact when the ignition is off,so the globe could glow permanently if a fault is registered & flatten the battery,like leaving your interior light on.Just go the extra yards & find a supply that is switched on with the ignition key,like clock,etc or just tap a supply with a 3amp fuse off the black/yellow wire coming off the ignition switch.Like i said i could be wrong but until someone else tells u otherwise just do this,u will be puttin the globe up near the cluster anyway so it will be right near the ignition switch wiring.U can connect to D1 for temporary testing purposes,but why cut into your wiring more than u need to.

Connect D4 to A23/A24 as well to ground it (i might put a switch between).
If u do this then u definitely need to put the switch in to take the ecu out of diagnostic mode,for normal operation.Make sure u know which is the off position on the switch & put it somewhere its not gonna get fiddled with.

BTW going by this layout :

http://www.ff-squad.com/tech/wiring/obd1.ecu-pinout.zip
____________________________________

once this is setup ill make a kool setup to blink stuff when vtec engages ;D

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Blue bits