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Home >> Chevrolet >> 2006 >> Impala LTZ >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - 3.9L - DTC P0442 To DTC P2A01 >> DTC P0443 or P0449 >> Circuit/System Testing
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Circuit/System Testing

P0443

  1. Turn OFF the ignition.
  2. Disconnect the EVAP canister purge solenoid valve.
  3. Turn ON the ignition, with the engine OFF.
  4. Probe the ignition 1 voltage circuit of the EVAP canister purge solenoid valve with a test lamp that is connected to a good ground.
    • If the test lamp does not illuminate, test the circuit for an open or for a short to ground.
  5. Connect a test lamp between the control circuit of the EVAP canister purge solenoid valve and the ignition 1 voltage circuit of the EVAP canister purge solenoid valve.
    • If the test lamp illuminates, test the control circuit of the EVAP canister purge solenoid valve for a short to ground.
  6. Command the EVAP canister purge solenoid valve to 50 percent with a scan tool.
    • If the test lamp does not flash or illuminate with the command, test the control circuit of the EVAP canister purge solenoid valve for an open or for a short to voltage.
    • If the circuits and the control module test normal, replace the EVAP canister purge solenoid valve.

P0449

  1. Turn OFF the ignition.
  2. Disconnect the EVAP canister vent solenoid valve.
  3. Turn ON the ignition, with the engine OFF.
  4. Probe the battery positive voltage circuit of the EVAP canister vent solenoid valve with a test lamp that is connected to a good ground.
    • If the test lamp does not illuminate, test the circuit for an open or for a short to ground.
  5. Connect a test lamp between the control circuit of the EVAP vent solenoid valve and the battery positive voltage circuit of the EVAP canister vent solenoid valve at the EVAP vent valve harness connector.
    • If the test lamp illuminates, test the control circuit of the EVAP canister vent solenoid valve for a short to ground.
  6. Command the EVAP canister vent solenoid ON and OFF.
    • If the test lamp does not illuminate with the commanded state of the valve, test the control circuit of the EVAP canister vent solenoid valve for a short to voltage or an open.
    • If the circuits and the control module test normal, replace the EVAP canister vent solenoid valve.
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