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I have a p28 ecu with a obd2 to obd1 jumper harness, i have no check engine lights but im trying to get my inspection but the DLC does not want to communicate, I checked the pins of the DLC and the red/white wire gets 12v, the two black wires get continuity and the blue/yellow wire to the ecu pin A21 get continuity, if all these things are functioning how they should why is my DLC not wanting to communicate?

  • You have a good ground at the diagnostic connector (2 black wires)? It could be a bad ecu. Have you tried a different reader? – Moab Jun 5 at 15:23

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