Body: 96 CX hatch (Obd2a)
Engine: B16A2 from 99-00 Si
Harness: 96-98 EX 5-spd (Obd2a)
ECU: P2T from 99-00 Si (Obd2b)

Just putting together a cheap build with a stock swap using leftover parts I already have lying around.

Trying to build my own jumper harness to use the 2a engine harness with the 2b ECU.

​​​​​​These are the pin locations I have from the info on FFSquad/Phareable, anyone confirm this is correct?

Pin D13 on the 2a harness is Secondary O2 Sensor Ground but couldn't find it on the 2b pinout. Should it just be grounded to body?

A1 B5
A2 B4
A3 B3
A4 B11
A5 A8
A6 C1
A8 B12
A9 B20
A10 B2
A11 B1
A12 B23
A15 A6
A16 A16
A17 A17
A18 A18
A20 B13
A22 B22
A23 B10
A24 B9
C1 C22
C2 C8
C3 C20
C4 C29
C5 A27
C6 A24
C7 A10
C8 A21
C10 B21
C11 C31
C12 C9
C13 C21
C14 C30
C15 C10
C17 C5
C18 C23
D1 C27
D2 C26
D3 C17
D4 C19
D5 A31
D6 C3
D7 C16
D8 C25
D10 C28
D11 C18
D12 C7
D13 ???
D14 A23

 

These can be purchased for next to nothing... why on earth would you bother to create one ?

 

 

A Rywire harness is $165, plus I'm in Canada so shipping & duty will bring it to over $200. Like I said I have all the parts I need & no issues depinning or rewiring.

 

I take it back. OBD2B to OBD2A conversion harnesses are $15 on ebay, but for some reason, there aren't any A to B conversion harnesses.

 

I know it doesn't make sense, since both should be just as easy to make. I can build one in no time as long as I have the right pinouts.

 

The secondary oxygen sensor Sensor Ground wire goes to junction connector C115, which is from PCM Connector C18.

 

Thank you. So it ties into SG2, which is D11 on 2a ECU and C18 on the 2b ECU?

 

Yes.

 

Dude, where do you get these diagrams?

 

They are from Honda Electrical Troubleshooting Manual (ETM).