That's because you're running an obd1 ecu.
There is a two pin plug in a rubber cap located above the ecu under the dash on the passenger side.
Put a paperclip across the two pins and watch the check engine light on the dash.
Use this link for help:
OBD 1 CEL codes...here....
I have an 01 h22 type s running its 01 obd2 ecu in my 99 ex.
No injector resistor box.
Only US OBD2 ECU'S use a secondary o2.
What do you need to hook up to the intake manifold vacuum?
All I have is my brake booster to its own nipple, evap canister to the evap purge solenoid, cruise control to...
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