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Home >> Buick >> 2008 >> Lucerne Super >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 4.6L - DTC P0340 To DTC P2138 >> DTC P0411 >> Circuit/System Testing >> Secondary Air Injection System Pressure Low

Secondary Air Injection System Pressure Low

  1. Engine running, inspect for exhaust leaks between the AIR solenoid valve and the catalytic converter.
    • If an exhaust leak is detected repair as necessary.
  2. Ignition OFF, disconnect the AIR pump relay.
  3. Engine running, connect the J 36169-HD  between the AIR pump relay switch B+ circuit terminal and the controlled output circuit terminal. Verify the AIR Pressure Sensor parameter is not 15-22 kPa above BARO.
    • If 15-22 kPa above BARO, replace the AIR pump relay.
  4. Ignition OFF, remove the fused jumper wire and connect the AIR pump relay.
  5. Remove the air inlet hose at the AIR pump.
  6. Engine running, command the AIR system ON while observing the AIR Pressure Sensor parameter. Verify the reading is not 8-15 kPa above BARO.
    • If 8-15 kPa above BARO, the AIR pump inlet hoses/pipes are restricted. Remove the restriction or replace the inlet hose/pipe.
  7. Ignition OFF, disconnect the hose at the AIR pump outlet.
  8. Disconnect the hose at the AIR solenoid valve inlet.
  9. Install a length of standard 1 inch I.D. (25.4 mm) hose from the AIR pump outlet to the AIR solenoid valve inlet.
  10. Engine running, command the AIR system ON while observing the AIR Pressure Sensor parameter. Verify the reading is not 8-15 kPa above BARO
    • If 8-15 kPa above BARO, test or inspect the AIR pump outlet hoses/pipes for leaks or restrictions.
  11. Test all AIR pump wiring and connections for less than 2 ohms. If the wiring and connections test normal, replace the AIR pump.
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