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No Communication With All Systems: Testing

  1. Turn ignition switch to LOCK position. Measure voltage between ground and DLC terminal No. 16. Battery voltage should exist. If battery voltage exists, go to next step. If battery voltage does not exist, check connectors between DLC and power supply for loose, damaged or corroded terminals. If problem exists, repair it. If problem does not exist, repair open in circuit between DLC and power supply.
  2. Check for resistance between ground and DLC terminal No. 4, then terminal No. 5. If resistance is less than 2 ohms at both terminals, replace scan tool. If resistance is 2 ohms or more at one or both terminals, repair open in appropriate circuit(s) between ground and DLC.
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