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Home >> Cadillac >> 2010 >> Escalade EXT >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System & Fuel System - 5.3L, 6.0L, 6.2L - DTC P1255 To DTC P3449 >> DTC P3401, P3425, P3441, or P3449 >> Circuit/System Testing
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Circuit/System Testing

  1. Ignition OFF, remove the intake manifold. Refer to Intake Manifold Replacement (Without AFM) or Intake Manifold Replacement (With AFM) .
  2. Disconnect the harness connector at the valve lifter oil manifold assembly.
  3. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal E and ground.
    • If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition circuit fuse is open, test all the components connected to the ignition circuit and replace as necessary.
  4. Verify that a test lamp does not illuminate between the ignition circuit terminal E and the appropriate cylinder deactivation solenoid control circuit terminal listed below.
    • Cylinder deactivation solenoid valve 1 terminal C
    • Cylinder deactivation solenoid valve 2 terminal A
    • Cylinder deactivation solenoid valve 3 terminal B
    • Cylinder deactivation solenoid valve 4 terminal D
    • If the test lamp illuminates, test the control circuit for a short to ground. If the circuit tests normal, replace the ECM.
  5. Remove the test lamp.
  6. Command the appropriate cylinder deactivation solenoid ON with a scan tool. Verify the scan tool Cylinder Deactivation Solenoid Valve Control Circuit High Voltage Test Status parameter displays OK.
    • If not the specified value, test the appropriate control circuit listed below for a short to voltage. If the circuit tests normal, replace the ECM.
      • Cylinder deactivation solenoid valve 1 terminal C
      • Cylinder deactivation solenoid valve 2 terminal A
      • Cylinder deactivation solenoid valve 3 terminal B
      • Cylinder deactivation solenoid valve 4 terminal D
  7. Install a 3 A fused jumper wire between the appropriate control circuit terminal listed below and the ignition circuit terminal E. Command the appropriate cylinder deactivation solenoid ON with a scan tool. Verify the scan tool Cylinder Deactivation Solenoid Valve Control Circuit High Voltage Test Status parameter displays Malfunction.
    • Cylinder deactivation solenoid valve 1 terminal C
    • Cylinder deactivation solenoid valve 2 terminal A
    • Cylinder deactivation solenoid valve 3 terminal B
    • Cylinder deactivation solenoid valve 4 terminal D
    • If not the specified value, test the control circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
  8. If all the circuits test normal, test or replace the valve lifter oil manifold assembly.
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