PatrickGSR94

iTrader: (1)

My friend and I are working on a J-spec ITR swap for his Civic, and while working on the wiring harness today we noticed that the ITR motor does not have the 2-wire plug for the VTEC pressure switch like most other VTEC engines do. The 1-wire solenoid harness plug is there, but not the pressure switch. Is the VTEC system different on these engines, i.e. does it use the other oil pressure reading in some way to operate VTEC? Are USDM B18C5's like this or is this just on JDM B18C's (P73 ECU)?

canuck-mx6

Just the JDM motors. If you are using a USDM ECU, you will need to use a USDM solenoid

Apex i ITR

Since its going into a 99CX I would keep the JDM ecu and get the limiter removed (or use the Apex'i Rev Speed meter or some other comparable way of killing the governor).

sgT

Last time I looked a jdm itr ecu wont fit a 99 CX harness

Apex i ITR

OBD1 style plugs.....oops I forgot.

eRACING

Here's your solution... First problem is gonna be the P73 ECU... you're gonna have to get a OBD2a - OBD2b adapter harness in order to connect your P73 ecu up to your factory ECU harness, that or buy a P28 and chip it with the P73 specs... My personal advice is, if your gonna run the B18C-R in your car, I'd spend the $250+/- on a conversion harness so you can run the factory motor's ecu, but use your factory CX wire harness for the new motor...its not that hard to wire in VTEC so it'll work.

In order to make the VTEC work at all for that motor if you're using your CX harness (I'd recommend using the CX harness) you'll have to wire in a few wires to make VTEC work... Run two wires from your motor to your ecu... VTEC Solnoid will have one wire coming off the plug...wire that to pinout A4 on your ecu, now for the VTEC Pressue Switch which doesn't have a sensor screwed into the motor...first off you'll have to wire in that plug to your ecu... there's two wires to that plug.... black (which you'll have to ground it to the motor somewhere) and a Blue/Black wire that you'll have to run to the ECU pinout D6. Now your VTEC will work proporly, but we haven't solved the no sensor to plug the VTEC pressure switch into yet... to solve this problem, T-tap a wire with one wire connecting to the single VTEC Solnoid wire and the other end of the wire connects to the Blue/Black wire from the VTEC Pressure Switch.... Problems solved... now just hide the pressure switch plug under like the radiator hose so you won't see it and go have fun...
To solve your missing VTEC Pressure Switch problem you'll

sgT

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Apex i ITR &raquo;</TD></TR><TR><TD CLASS="quote">OBD1 style plugs.....oops I forgot.</TD></TR></TABLE>

No, that would be OBD2-A
99-00 civic is OBD2-B

eRACING

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sgT &raquo;</TD></TR><TR><TD CLASS="quote">

No, that would be OBD2-A
99-00 civic is OBD2-B</TD></TR></TABLE>

thanks for the correction... your right

PatrickGSR94

iTrader: (1)

wait wait the car is a 98 CX, and we're using a 97 EX harness. It's all OBD2 plugs. The harness plugs into the P73 no problem.