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Home › GMC › 2011 › Terrain SLT, 2.4 C, AWD › Repair and Diagnosis › Engine Performance › System › Engine Controls And Fuel - 2.4L - DTC P0300 Through P1682 › DTC P0443 or P0449 › Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the Q 12 evaporative emission canister purge or the Q 13 vent solenoid valve.
  2. Ignition ON, verify that a test lamp illuminates between the voltage supply circuit terminal and ground.
    • If the test lamp does not illuminate, test the voltage supply circuit for a short to ground or an open/high resistance. If the circuit tests normal and the voltage supply circuit fuse is open, test or replace the evaporative emission canister purge solenoid valve.
  3. Connect a test lamp between the voltage supply circuit terminal and the control circuit terminal.
  4. Command the EVAP canister purge solenoid valve to 50 percent with a scan tool, or the EVAP canister vent solenoid valve ON and OFF. The test lamp should respond to the command.
    • If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the K20 ECM.
    • If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K20 ECM.
  5. If all circuits test normal, replace the appropriate solenoid valve.
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