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Home >> Cadillac >> 2013 >> Escalade Base, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 13 (Engine Controls/Fuel - Hybrid (LZ1) - DTC P0351 To DTC P3449 And Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P0443 or P0449 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
  1. Ignition OFF, disconnect the harness connector at the following:
    • Q12 evaporative emission purge solenoid valve for P0443
    • Q13 evaporative emission vent solenoid valve for P0449
  2. Ignition ON, verify that a test lamp illuminates between the voltage supply circuit:
    • Terminal A and ground for the purge solenoid valve
    • Terminal B and ground for the vent solenoid valve
    • If the test lamp does not illuminate, test the voltage supply circuit for a short to ground or an open/high resistance. If the circuit tests normal and the voltage supply circuit fuse is open, test all components connected to the voltage circuit and replace as necessary.
  3. Connect a test lamp between the voltage supply circuit and the control circuit .
  4. With a scan tool command the following:
    • EVAP purge solenoid valve to 50%
    • EVAP vent solenoid valve ON (Not Venting) and OFF (Venting)

      The test lamp should respond to the command.

    • If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the K20 Engine Control Module.
    • If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module.
  5. If all circuits test normal, replace the appropriate solenoid valve.
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