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Home >> Hummer >> 2010 >> H3T Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 3.7L - DTC P0335 To DTC P1381 >> DTC P0411 >> Circuit/System Verification
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Circuit/System Verification

    NOTE: Verify the battery is fully charged before proceeding with this diagnostic procedure. The Air Pump output will vary with system voltage.
  1. Ignition ON, observe the DTC information with a scan tool. Verify that DTCs P0412, P0418, P2430, P2431, P2432, P2433, P2440, or P2444 are not set.
  2. Compare the scan tool BARO pressure parameter to the Altitude Versus Barometric Pressure table. The BARO should be within the specified range displayed in the table for the specific altitude.
    • If not within the specified range, refer to DTC P0106 for further diagnosis.
  3. Compare the scan tool Air Pressure Sensor pressure parameter to the BARO reading. The readings should be within 3 kPa (0.5 psi).
  4. Command the the following relays ON and OFF with a scan tool. You should hear, or feel, the relay click when commanded ON and OFF:
    • Air Pump Relay
    • Air Solenoid Relay
  5. Command the Air Solenoid ON and OFF with a scan tool. Listen or feel for Air Solenoid operation. The Air Solenoid should respond to the scan tool commands. Repeat as necessary in order to verify Air Solenoid operation.
    • If the Air Solenoid does not respond to the scan tool commands, refer to DTC P2440 .
  6. Engine idling, command the Air Pump Relay ON with a scan tool while observing the Air Pressure Sensor parameter. The reading should change greater than 16 kPa (2.3 psi).
  7. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
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