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6: This step tests if the EVAP canister vent solenoid valve control circuit is grounded. DTC P0449 Step Action Yes No Schematic Reference:Engine Controls Schematics 1 Did you perform the Diagnostic System Check - Engine Go to Step 2 Go to Diagnostic System Check - Engine Controls 2 1. Turn ON the ignition, with the engine OFF. 2. Command the evaporative emission (EVAP) canister vent solenoid valve ON and OFF with the scan tool. Do you hear or feel a click from the EVAP canister vent Go to Step 3 Go to Step 4 3 1. Observe the Freeze Frame/Failure Records for this DTC. 2. Turn OFF the ignition for 30 seconds. 3. Turn ON the ignition, with the engine OFF. 4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the Did the DTC fail this ignition? Go to Step 4 Go to Intermittent Conditions 4 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 batter positive voltage circuit of the EVAP canister vent solenoid valve with a test lamp Does the test lamp illuminate? Go to Step 5 Go to Step 11 5 1. Connect a test lamp between the control circuit of the EVAP canister vent solenoid valve and battery 2. Command the EVAP canister vent solenoid valve ON
2004 Hummer H2 2004 ENGINE PERFORMANCE Engine Controls Diagnosis (DTC P0171/P0174 To DTC P0507 (TAC)) - 4.8L, 5.3L, and 6.0L - Hummer H2
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