OBD1 PLUG CONFIGURATION
Below is an example that shows the common onboard male connectors
for a Honda OBD1 ECU.
Take note of plugs: A
The 4-plug OBD1 connector image below is proof these do exist and are usually
I do not have pin schematics
for the JDM 4-plug OBD1 ecu! Although, connectors A B D should technically be the same pin locations as a 5spd 3-plug OBD1 ECU.