Hi,
I just recently bought an 01 Integra GSR. Love the car but have a few problems. The car had an OBD1 ecu with a conversion harness in it when I bought it and I needed to pass emissions. So I thought by replacing the obd1 ecu with an obd2 ecu it would let an obd scanner communicate with my car. So I bought an OBD2A Ecu so I didnt have to deal with the immobilizer unit, and the conversion harness from OBD2B-->OBD2A. Well after swapping ECUs, still no communicating. I replaced the cigarette lighter fuse and the ECU fuse from under the hood. Still nothing. So at this point, Ive gone to look at the factory wiring harness. Here are some pictures I snapped. Ive been told the harness is indeed still an OBD2 harness so everything should be working. Here are some pictures...
Engine wiring harness plugged into the conversion harness. OBD2A to OBD2B

Conversion Harness and new ECU

Cars wiring harness

 

Sorry for the second post, figured itd be easier to read...
So I went to look at the connectors and there are blue spade connectors on some of the wires. Heres what they were...

Connector B: Pin 1(IGP1 Power Source)
Pin 12: Vtec solenoid
Pin 13: Ignition Control Module
Pin 20: Logic Ground*** This wire had no spade but looked frayed with insulation break and exposed wire
Connector C
Pin 10: Vtec Pressure Switch
Pin 16: Primary 02 Sensor
Pin 27: Throttle Position Sensor

Connector A had multiple wires wrapped together with other wires from Connector B. Connector A seems to be where all the problems are coming from. Picture of spliced wires between the 2...


Connector A doesnt seem to follow the pin layout on this diagram here
http://api.viglink.com/api/click?for...13457013475111
Not sure where to go from here.

 

Is the new ECU you got a JDM ECU?

 

Its a P72-013, which I looked up I guess its JDM?

 

So apparently it being JDM, a scanner wont be able to communicate with it? So I have to get a USDM P72 ECU for it to work with a scanner?

 

Yep

 

This one should work with my stepdown right?
http://www.ebay.com/itm/110939302074...#ht_500wt_1288

 

Anyone? I have a deal lined up to buy a p72-a04 ecu, and I already have an obd2b>>obd2a ecu conversion harness. Would this ecu communicate with an obd scanner tool so I could get my car emissions legal?

 

It should, it's usdm.

 

http://www.hondata.com/techecuid.html

 

Thank you sir.