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Home >> Audi >> 1994 >> 90 CS Quattro >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Self-Diagnostic System >> Checking DLC Wiring >> White DLC
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White DLC

  1. Disconnect all wires from terminals "K" and "L", noting from which terminals wires are disconnected. See Figure or Figure . Check continuity between power terminal of White DLC connector and terminal "L", and between ground terminal of White DLC connector and terminal "K". If there is no continuity, repair wiring.
  2. If there is continuity, check continuity between:
    • ECM terminal C13 and appropriate wire at terminal "L"
    • ECM terminal C12 and appropriate wire at terminal "K".
  3. If there is no continuity, repair wiring. If there is continuity, connect wires for ECM rapid data transfer to terminals "K" and "L". Attempt to enter ENGINE ELECTRONICS (address word "01"). If ENGINE ELECTRONICS cannot be entered, replace ECM.
  4. If ENGINE ELECTRONICS can be entered, check wiring between terminals "K" and "L" and control units for all other systems. If wiring is okay, replace appropriate control unit.
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