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now my car is a 90 hatch with a obd0-obd1 jumper, just curious on how you would check for a code whenever the check engine light comes on,
 

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Do you not have a service jumper connection under the passenger side dash?
The service connection is under the dashboard. It might be a little hard to find but it's under there on the passenger side near the door. All you have to do is jumper the two pins on it then count the blinks and look up the code. The obd0 cars have this connection as well.
 

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Assuming you have a rywire obd-0 to obd-1 conversion

Connect the BLUE wire to one side of the toggle switch.
Connect the ORANGE wire to the other side of the toggle switch. The obd-1 ecu uses a the check engine light in the dash to flash codes.
Connecting the ORANGE and BLUE wires will allow you to check the codes through the check engine light with just flipping the toggle switch.
*Just make sure that If you dont end up utilizing these wires for a toggley
switch, cover them up or they will ground out.

I summarized the above from rywire.
 

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The service connection is under the dashboard. The obd0 cars have this connection as well.
on obd0 this would be the timing advance interupt service connection that you jumper when adjusting your timing. Only on 90-91. 88-89 have this connection in the engine bay on the drivers side.
 
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