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ECU WIRING TABLE for OBD0 B-series motors into 85-87 CRX/CIVIC Si |
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As compiled by 87sivtec |
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85-87 CRX/Civic Si ECU |
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89-91 PR3/PW0 JDM ECU |
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| Pin # |
Description |
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Pin # |
Description |
Notes |
| A1 |
#1 Injector (Brown) |
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A1 |
#1 Injector (Brown) |
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| A2 |
Ground (Black) |
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A2 |
Ground (Black) |
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| A3 |
#2 Injector (Red) |
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A3 |
#2 Injector (Red) |
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| A4 |
Ground (Black) |
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A4 |
Ground (Black) |
Connects to Black Ground on Main Relay |
| A5 |
#3 Injector (Red/Black) |
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A5 |
#3 Injector (Lt. Blue) |
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| A6 |
Ground (Black) |
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A6 |
Purge cut off valve (Blue) |
Don't need |
| A7 |
#4 Injector (Yellow) |
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A7 |
#4 Injector (Yellow) |
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| A8 |
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A8 |
Vtec Solenoid (Green/White) |
Add This. |
| A9 |
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A9 |
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| A10 |
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A10 |
Pressure Regulator Cutoff valve |
Don't need |
| A11 |
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A11 |
IACV/EACV (Blue/Yellow) |
Add This. |
| A12 |
Main Relay (Green/Blue) |
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A12 |
Main relay (Green/Black) |
Connects to Green/Black on main relay |
| A13 |
12V Ignition |
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A13 |
12V Ignition (Yellow/Black) |
Joins A15 |
| A14 |
Main Relay |
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A14 |
Main relay |
Joins A12 |
| A15 |
12V Ignition (Yellow/Black) |
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A15 |
12V Ignition (Yellow/Black) |
From main relay. Also powers injectors and IACV. |
| A16 |
Ground (Brown/Black) |
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A16 |
Ground (Brown/Black) |
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| A17 |
12V (White/Green)-from fuse 10 |
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A17 |
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| A18 |
Ground (Black/Red) |
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A18 |
Ground (Black/Red) |
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| B1 |
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B1 |
Main Fuse Box (White/Green) |
From Hazard Fuse |
| B2 |
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B2 |
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| B3 |
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B3 |
A/C clutch relay (yellow) |
You're good if you need this! |
| B4 |
Fast idle control solenoid (Green/Yellow) |
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B4 |
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| B5 |
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B5 |
VTEC Oil Pressure switch (Blue/Black) |
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| B6 |
Check engine light (Green/Orange) |
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B6 |
Check engine light (Green/Orange) |
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| B7 |
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B7 |
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| B8 |
A/C Switch (Brown/Red) |
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B8 |
A/C Switch (Blu/Red) |
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| B9 |
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B9 |
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| B10 |
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B10 |
Crank angle sensor (Orange) |
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| B11 |
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B11 |
Defogger switch (Black/Green) |
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| B12 |
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B12 |
Crank angle sensor (White) |
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| B13 |
Ignition Switch (Brown/White) - From main relay |
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B13 |
Ignition Switch (Brown/White) |
From Main Relay and No. 2 Fuse. |
| B14 |
Alternator Input (White/Red) |
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B14 |
Alternator input (blue) |
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| B15 |
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B15 |
Ignitor |
Joins B17 - both go to ignitor |
| B16 |
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B16 |
VSS (yellow/red) |
Add this Or VTEC will NOT work. |
| B17 |
Purge cutoff solenoid valve (Red/White) |
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B17 |
Ignitor |
Joins B15 - both go to ignitor |
| B18 |
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B18 |
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| B19 |
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B19 |
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| B20 |
IMA-idle mixture adjustment sensor (white/yellow) |
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B20 |
Ignition timing adjustment connector |
(Brown) Gets grounded to set ECU into adjustment mode |
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| C1 |
#1 CYL sensor (orange changing to red) |
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C1 |
#1 CYL sensor (Blue/Green) |
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| C2 |
#1 CYL sensor (Blue/Yellow) |
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C2 |
#1 CYL sensor (White) |
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| C3 |
TDC sensor (orange/blue changing to Brown) |
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C3 |
TDC sensor (orange/blue) |
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| C4 |
TDC sensor (white/blue changing to Blue) |
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C4 |
TDC sensor (white/blue) |
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| C5 |
Intake air temp (Red/yellow) |
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C5 |
TA sensor - Intake temp (red/yellow) |
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| C6 |
Watertemp (red/white) |
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C6 |
TW sensor - water temp (red/white) |
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| C7 |
Throttle angle sensor (red/blue) |
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C7 |
Throttle angle sensor - TPS (red/blue) |
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| C8 |
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C8 |
O2 #2 (red/blue changing to orange) |
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| C9 |
PA sensor (red) |
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C9 |
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| C10 |
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C10 |
Brake switch (green/white) |
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| C11 |
MAP sensor (white) |
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C11 |
MAP sensor (white) |
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| C12 |
Ground (Brown/Black) used for TPS,TW,PA,IMA |
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C12 |
Ground (green/white changing to green) Joins ignition timing connector, TW ,TPS, TA |
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| C13 |
Throttle angle , PW, IMA (yellow/red) |
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C13 |
Throttle angle sensor - TPS (yellow/white) |
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| C14 |
MAP sensor (brown/white) |
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C14 |
MAP sensor (green/white) |
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| C15 |
MAP sensor (red) |
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C15 |
MAP sensor (red/yellow) |
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| C16 |
O2 sensor (white) |
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C16 |
O2 #1 (White) |
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Please Note, I have tried to be as accurate as possible, but there may be some errors.
Pictures of OBD0 Plugs Can Be found here --->[[1]]
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![[1]](http://www.ff-squad.com/tech/wiring/wiring.88-91.jpg){kind=link}