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Home >> Isuzu >> 2007 >> i-290 LS, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 90 (Engine Control System & Fuel System - 3.7L - DTC P1111 To DTC P2444) >> DTC P2440 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2007 Isuzu i-370, 2007 GMC Canyon, and 2007 Chevrolet Colorado. 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.
  5. If the solenoid valve inspects OK, replace the AIR pump.
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