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Home >> Chevrolet >> 2006 >> Cobalt LTZ >> Repair and Diagnosis >> External Pages >> Different car >> Section 695 (Engine Controls And Fuel - 2.2L (L61) - DTC P0420 To DTC P2544) >> DTC P2440 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2007 Pontiac G5 Pursuit, 2007 Pontiac G5, and 2007 Chevrolet Cobalt. 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 AIR solenoid voltage supply and the AIR solenoid ground circuit terminals is not illuminated.
    • If the test lamp is illuminated, test for a short to voltage on the AIR 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.
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