OBDI ECU plugs in a 1988-1991 CRX
Created by: StorminMatt from the CRX Resource - posted 01-16-2001 00:00 CT

Z6 Wiring Conversion - for the P28 ECU.

A number of people have asked me how to change the 1988-1991 ECU plugs to 1992-1995 plugs in order to use a 1992-1995 ECU for any one of a number of applications (SOHC VTEC, 2G B16A, 1992+ B18A/B18B, B17A, B18C, etc.). I figured it would be best to just make one post with this information rather than having to email everybody separately with this information. There are a couple of things to remember here. I personally prefer the numbering system whereby the pins are numbered across rather than the zig-zag system used by Honda. But I realize alot of people may prefer or are used to the zig-zag system. So for each pin (on each plug style), I list two locations for the same pin. The first is given by numbering across. The second (in parenthesis) is by the zig-zag numbering (I hope it is correct). In case I made any errors in conversion AND to make the process of changing the plugs over more goof proof, I also give the color of the wire on the 1992-1995 plug and 1988-1991 plug for the given pins. This should give you a better idea of whether you are connecting the wires together correctly. Also, the first set of pin numbers and wire colors are all on the 1992-1995 plugs and the second, the 1988-1991 plugs.

A plug (1992-1995 plug)

A1 (A1) ----> A1 (A1)
brn --------> brnA2 (A3) ----> A2 (A3)
red --------> red
A3 (A5) ----> A3 (A55)
lt. blu ----> lt. blu
A4 (A7) ----> A14 (A12)
grn/yel ----> grn/blk
A5 (A9) ----> A5 (A11)
grn/wht ----> blu/yel
A7 (A13) ---> B13 (B6)
grn/org ----> grn/org
A8 (A15) ---> B2 (D33)
blk/red ----> yel
A11 (A21) --> B8 (B15)
red/grn ----> wht
A12 (A23) --> A9 (A2)
blk --------> blk
A13 (A25) --> A6 (A113)
yel/blk ----> yel/blk
A14 (A2) ---> A4 (A7)
yel --------> yel
A15 (A4) ---> (VTEC)
org/wht ----> (your choice)
A16 (A6) ---> (O2S heater)
org/blk ----> (your choice)
A17 (A8) ---> A15 (A14)
grn/yel ----> grn/blk
A19 (A12) --> B12 (B4)
yel/grn ----> yel/grn
A21 (A16) --> B3 (B55)
wht/yel ----> wht/yel
A23 (A20) --> A11 (A6)
red --------> grn
A24 (A22) --> B9 (B17)
red/grn --------> wht
A25 (A24) --> A10 (A4)
blk --------> blk
A26 (A26) --> A17 (AA18)
blk/red ----> blk/red

B Plug (1992-1995 plug)

B1 (B1) ----> A7 (A15)
yel/blk ----> yel/bblk
B3 (B5) ----> B14 (B8)
blu/red ----> blu/red
B5 (B9) ----> B7 (B13)
blu/wht ----> blu/wht
B6 (B11) ---> B15 (BB10) **
org --------> org
B7 (B13) ---> C2 (C3) **
org/blu ----> org/blu
B8 (B15) ---> C1 (C1) **
blu/grn ----> blu/grn
B9 (B2) ----> A16 (A16)
brn/blk ----> brn/blk
B13 (B10) --> B18 (B16)
yel/blu ----> yel/red
B14 (B12) --> B16 (B12) **
wht --------> whtt
B15 (B14) --> C10 (C4) **
wht/blu ----> wht/blu
B16 (B16) --> C9 (C2) **
blu/yel ----> blu/yel

D Plug (1992-1995 Plug - NO C plug on 1992-1995 Plugs)

D1 (D1) ----> B1 (B1)
wht/blu ----> wht/grn
D2 (D3) ----> (Knock Sensor)
red/blu ----> (your choice shielded wire)
D5 (D9) ----> B17 (B14)
pnk --------> blu
D6 (D11) ---> C4 (C7)
red/blu ----> red/bluu
D7 (D13) ---> C11 (C6)
red/wht ----> red/wht
D8 (D15) ---> C3 (C5)
red/yel ----> red/yel
D9 (D17) ---> C6 (C11)
wht --------> wht
D10 (D19) --> C8 (C15)
yel/grn ----> yel/red
D11 (D21) --> C15 (C14)
grn/blu ----> grn/wht
D12 (D2) ---> C13 (CC10)
grn/wht ----> grn/wht
D13 (D4) ---> B20 (B20)
brn --------> brn
D14 (D6) ---> (VTEC Pressure Switch)
org/blu -----> (your choice)
D16 (D10) --> B10 (B19)
grn/red ----> grn/reed
D18 (D14) --> C16 (C16)
wht --------> wht
D21 (D20) --> C7 (C13)
yel/wht ----> yel/wht
D22 (D22) --> C14 (C12)
grn/wht ----> grn/wht

The pins marked ** connect to the distributer sensors (crank angle, TDC, and CYP). The reason I marked these is that while 1988-1991 and 1992-1995 cars both use the same color wires collectively for these sensors (org, org/blu, wht, wht/blu, blu/grn, blu/yel), wires of a given color do NOT necessarily connect to the same sensors in the 1992-1995 cars as in 1988-1991 cars. So if you check the Hasport pinout, the connections I gave will be incorrect. However, it is actually easier to just match up like colors. If you do this, just remember to match the proper colors on the distributer plug as well. In other words, the org wire on the 1988-1991 engine harness goes into the same spot on the 1992-1995 distributer plug that the org wire went to on the 1992-1995 dash harness.

Just don't confuse the fat white wire with this thin white wire on the distributer plug of the 1988-1991 engine harness. The fat white wire on the 1988-1991 harness goes where the fat yel/grn wire on the 1992-1995 harness went (on the 1992-1995 distributer plug). But the thin white wire on the 1988-1991 harness goes where the thin white wire on the 1992-1995 harness was.

There is one other thing of considerable importance that anyone should know who is doing a OBDI conversion with an Integra motor. Alot of the wire colors are different from the 1992-1995 Civic. But from what I have heard, the pinout is identical. So the connections should be the same even if the colors are not.

Speaking of other cars, keep in mind that I made this chart for a USDM B16A swap. Other engines may not have all the wires listed (a B18A/B18B will have no VTEC, VTEC pressure switch, or knock sensor) or may have more (A B18C will have IAB control).

   

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