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Home >> Buick >> 2007 >> Allure CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 72 (Engine Control System & Fuel System - 3.8L - DTC P2119 To DTC P2444 & DTC U0107) >> DTC P2440 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect the solenoid valve.
  2. Ignition ON, observe that a test lamp installed between the solenoid voltage supply and the solenoid control circuit terminals is not illuminated.
    • If the test lamp is illuminated, test for a short to voltage on the solenoid voltage supply circuit. If the circuit tests normal, test or replace the relay.
  3. Inspect the AIR pump inlet and outlet hoses/pipes for restrictions.
  4. Inspect the solenoid valve for leaks.
    • If the solenoid valve inspects OK, replace the AIR pump.
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