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Home >> Chevrolet >> 2011 >> Aveo LS, 4D Hatchback, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Data Communications System >> Diagnostic Information and Procedures >> Scan Tool Does Not Communicate with Keyword Data Line >> Circuit/System Testing
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Circuit/System Testing

  1. Ignition OFF, disconnect the harness connectors of the module that is not communicating with the scan tool.
  2. Test for less than 1Ω between the module ground circuit terminal and ground.
    • If greater than the specific range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify that a test lamp illuminates between the battery positive voltage circuit terminal and ground.
    • If the test lamp does not illuminate, test the battery positive voltage circuit for a short to ground or an open/high resistance. If the circuit fuse is open, test any positive voltage outputs of the module for a short to ground. If all circuits test normal, replace the module.
  4. Ignition ON, if applicable, verify that a test lamp illuminates between any ignition voltage circuit terminals and ground.
    • If the test lamp does not illuminate, test the ignition voltage circuit for a short to ground or an open/high resistance. If the circuit fuse is open, test any positive voltage outputs of the module for a short to ground. If all circuits test normal, replace the module.
  5. Test for infinite resistance between the data link connector (DLC) keyword 2000 serial data circuit terminal and ground.
    • If less than the specified value, test the serial data circuit for a short to ground.
  6. Test for less than 1V between the DLC keyword 2000 serial data circuit terminal and ground.
    • If greater than the specified range, test the serial data circuit for a short to voltage.
  7. Test for less than 1Ω in the keyword 2000 serial data circuit between the module connector terminal and the DLC terminal.
    • If greater than the specified range, test the serial data circuit for open/high resistance.
  8. If all circuits test normal, replace module.
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