I am doing a JDM ITR swap into an EG hatch with an OBD1 P28 Kenji ECU, swap is ongoing, but i am anticipating an issue with the wiring

The problem is i dont have a grounding wire on the chassis loom, or at least i dont think i will, as i have a RHD JDM EG4 hatch which has the D15B OEM with P08 and no VTPS, so i suspect the chassis loom wont have any VTPS wiring, and neither will the JDM ITR loom i am using. I know about the A4/D6 splice for the power, thats ok, but what about the ground, will it throw a CEL if the USDM P28 doesnt see a ground

So does anyone know if i need ground the VTPS direct from the ECU, and if so, what pin on the ECU needs to be grounded?

Any help appreciated

 

On my 91 b16 swap I grounded it to the chassis, I would hazard a guess that you can do the same.

 

but what did you ground to chassis, i have no switch on the B18C motor, and no connector or wiring on the engine loom

The VTM/VTPS has 2 wires, power from D6 and another from the switch to ground, as i understand it the ECU looks for a ground signal unless VTEC is engaged when it looks for a 12V signal, hence the fix too splice A4 to D6. The A4/D6 splice means you get 12V at D6 when the A4 goes to 12v when VTEC engages, but it wont be grounded.

Is this a problem?

I had a look yesterday and my D15B engine does have a VTEC pressure switch, so my chassis loom should have the wiring, just not sure where it terminates, as the JDM ITR engine loom doesnt have the wiring or the connector. I will try and chase it from my D15B engine loom, but if i had an idea where too look it would be helpful.

So the P28 ECU and my chassis loom should have the wiring, i just need to know where i find it? any ideas on wiring colour, or connector location ( eg drivers or passenger side tower)

cheers

eddy

 

I might be off on this or misunderstanding something, but can you just use a US-Spec VTEc solenoid with the VTPS on it and use the base of the VTEC solenoid as a ground like the American cars do?

Or am I missing something?

 

Tom, my setups a little unusual being USDM P28ECU, JDM chassis loom, JDM engine loom, JDM engine. I have no wiring from chassis to VTEC soloid to do the swap simply, i was hoping for an easy way, rather than buying new solenoid and doing all the wiring, or paying the shop to do it

Anyway, Slopoke got me the answer i wanted in the end

The VTEC solenoid, A4, is grounded too, so when you splice D6 to A4, when the solenoid goes 12V, both switch to 12V, and when it goes back, both ground. Could have tested this with continuity i guess, but i dont have a car, was looking for the tech answer too

Picking the car up tomorrow so should be able to test it out then

thanks for the help anyway