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Home >> Cadillac >> 2007 >> DTS 4.6 9 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - 4.6L - DTC P0351 To P2440 >> DTC P2440 >> Circuit/System Testing
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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.
    • If the solenoid valve inspects OK, replace the AIR pump.
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