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No Communication With All Systems

  1. Check voltage between ground and OBD-II Data Link Connector (OBD-II DLC) terminal No. 16. If battery voltage exists, go to next step. If battery voltage does not exist, repair connectors and/or wiring between OBD-II DLC and power supply.
  2. Check resistance between ground and OBD-II DLC terminals No. 4 and 5. If each resistance is less than one ohm, repair or replace scan tool as necessary. If either resistance is one ohm or more, repair wiring between ground and OBD-II DLC.
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