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Home >> Chevrolet >> 2006 >> Silverado 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 943 (Engine Controls And Fuel - 4.8L, 5.3L, 6.0L And 6.2L - DTC P1380 To DTC P3449) >> DTC P3401, P3425, P3441, or P3449 >> Component Testing

Component Testing

WARNING: This page is about a different car, the 2007 GMC Sierra, 2007 GMC Cab & Chassis Sierra, 2007 Chevrolet Silverado, and 2007 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT: Perform the Circuit/System Testing  first.

Static Test

  1. Ignition OFF, disconnect the VLOM harness connector at the VLOM assembly.
  2. Connect the cable that is labeled resistance from the EN-46999  to the VLOM connector.
  3. Connect the power leads from the EN-46999  to B+ and ground. Test for 11-18 ohms of resistance on each VLOM solenoid.
    • If the resistance is not within the specified range for each solenoid, replace the VLOM assembly.
  4. Test for infinite resistance between each VLOM circuit terminal and the VLOM housing.
    • If less than infinite resistance, replace the VLOM assembly.

Dynamic Test

  1. Ignition OFF, disconnect the VLOM harness connector at the VLOM assembly.
  2. Connect the cable that is labeled power from the displacement on demand EN-46999  to the VLOM connector.
  3. Connect the power leads from the EN-46999  to B+ and ground.
  4. Command each VLOM solenoid ON and OFF using the EN-46999  . You should be able to hear each solenoid turn ON and OFF.
    • If the function does not perform as specified, replace the VLOM assembly.
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