I was installing my chipped p28 ecu into my friends 2000 gs-r with a obd2-obd1 harness and when we start it up the car starts for a second then the rpms just drop and the car stalls.
Has this happened to anyone?
Could it be the harness or the ecu or is it just not meant for a gs-r?
Any help would be greatly apprecaited
TIA
-BRian

 

The problem is the imobilizer. The adapter is not properly setup for this. There needs to be a jumper wire added from pin A15 to pin A16. This will make it work.

 

This will cause the motor not to start? If so do you have any more info on this?

 

The way the immobilizer works, is it feeds the fuel pump relay through pin A16, but pin A15 is also there for cars with no immobilizer. If your adapter is wired for the fuel pump at A15, then the car will start, but fuel pressure will go away almost instantly, and the motor will die. By putting a jumper from A15 to A16, you are bypassing the immobilizer circuit.

Trust me, it will work. I build adapters for a living (well sometimes it seems like it)!

 

Actually, by jumping A15 and A16 (OBD2v2) you are making sure the fuel pump relay circuit is complete.

The story behind the A15 and A16 thing is as follows. The '99-'00 Civic ECU has the fuel pump relay wire at A16. The '00-'01 Integras have the fuel pump relay wire at A15 but all other ECU pin locations are the same (in almost all cases) as the '99-'00 Civic ECUs. When most people make their harnesses they wire it up for a Civic (fuel pump relay wire at A16) and not for the '00-'01 Integra (fuel pump relay wire at A15).

Here's the deal with the immobilizer, when switching to an OBD1 ECU you are eliminating the immobilizer. The immobilizer is inside the OBD2v2 ECU on '00-'01 Integras. It is not present on OBD1 ECUs nor on '96-'00 Civic ECUs. Therefore, when you use an OBD2 to OBD1 harness and an OBD1 ECU the immobilizer is no longer present in the vehicle.

So, what Jaker said was partially correct. You need to add a pin and wire at A15 and tap into A16 to make the harness work for your particular application.

These are the facts. The answers provided here come from experience.

-kenji




[Modified by kenji, 3:38 AM 12/2/2002]

 

thanks kenji i apprecaite your help

-Brian