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Verify battery voltage at the +B to E2 pins on the back of the ECU with the key on. If you don't get 12 volts, then you might have a bad ground.
If the check light comes on when you turn the key on, then goes away, then the check circuit is fine.
If the diagnostic check doesn't happen when you short TE1 and E1 in the diagnostics box, then manually short them on the back of the ECU.
If you do all of this and still don't get codes, then replace the ECU.
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