LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Buick >> 2006 >> Lucerne CXS >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - 4.6L - DTC P1400 To DTC P2444 >> DTC P2440 >> Circuit/System Testing
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Circuit/System Testing

  1. Disconnect the AIR solenoid valve.
  2. Ignition ON, connect a test lamp between the AIR solenoid voltage supply terminal 6 and the solenoid ground circuit terminal 4, the test lamp should not illuminate.
    • If the test lamp illuminates, test the AIR solenoid supply voltage circuit for a short to voltage. If the circuit tests normal, test or replace the AIR solenoid relay.
  3. Inspect the AIR pump inlet and outlet hoses/pipes for leaks or restrictions.
  4. Inspect the AIR solenoid valve for leaks.
scientia non olet · About LEMON Manuals