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Home >> GMC >> 2006 >> Envoy 4.2 S, 4WD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - 4.2L - DTC P0135 To P0418 >> DTC P0411 >> Component Testing

Component Testing

  1. Connect the AIR pump to fused battery voltage and ground and observe pressurized airflow at the pump outlet.
    • If pressurized airflow is not observed, replace the pump.
  2. Connect the relay coil connections to fused battery voltage and ground. Measure resistance through the relay contacts at 0 ohms.
    • If resistance measures more than 0 ohms, replace the relay.
  3. Apply fused battery voltage and ground to the solenoid and verify that the valve opens and closes completely as voltage is applied to and removed from the solenoid. Observe that the valve is not obstructed.
    • If the valve operates incorrectly or is obstructed, remove the obstruction or replace the valve.
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