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Home >> Cadillac >> 2006 >> DTS 4.6 9 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - 4.6L - DTC P1400 To P2444 >> DTC P2440 >> Circuit/System Testing
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Circuit/System Testing

  1. With the ignition ON, the engine OFF, disconnect the solenoid valve harness connector, connect a test lamp between the solenoid voltage supply and solenoid ground circuits, observe that the test lamp is not illuminated.
    • If the test lamp is illuminated, test for a short to voltage on the solenoid voltage supply circuit. If the circuit test normal, replace the AIR control solenoid relay.
  2. Inspect the AIR pump inlet and outlet hoses/pipes for restrictions or leaks.
    • If a restriction or leak is found, remove the restriction or replace the hoses/pipes.
  3. Inspect the AIR solenoid valve for any of the following conditions:
    • Binding or sticking in the open position
    • Leaks
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