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Home >> Cadillac >> 2013 >> Escalade Hybrid, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 12 (Engine Controls/Fuel - 5.3L, 6.0L, 6.2L - DTC P0442 To DTC P3449 And Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P0443 >> 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 Q12 Evaporative Emission Purge Solenoid Valve.
  2. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal A 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 not open, test all components connected to the voltage supply circuit and replace as necessary.
  3. Verify that a test lamp does not illuminate between the ignition circuit terminal A and the control circuit terminal B.
    • If the test lamp illuminates, test the control circuit for a short to ground. If the circuit tests normal, replace the K20 Engine Control Module.
  4. Remove the test lamp, and install a 3 A fused jumper wire between the control circuit terminal B and the ignition circuit terminal A. Command the purge solenoid to 50 % with a scan tool. Verify the scan tool EVAP Purge Solenoid Valve Control Circuit High Voltage Test Status parameter is Malfunction.
    • If not the specified value and, the circuit tests normal, replace the K20 Engine Control Module.
  5. If all circuits test normal, replace the Q12 Evaporative Emission Purge Solenoid Valve.
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