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Home >> Isuzu >> 2007 >> Ascender 4WD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - 4.2L - DTC P0442 To DTC P2101 >> DTC P0449 >> Circuit/System Testing
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Circuit/System Testing

  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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