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Home >> Cadillac >> 2009 >> Escalade Base, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 12 (Engine Control System & Fuel - Hybrid (Hp2) 6.0L (LFA) - DTC P0010 To DTC P0232) >> DTC P0201, P0202, P0203, P0204, P0205, P0206, P0207, or P0208 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
  1. Ignition OFF, open the hood to disable the Auto-Stop function. Refer to Hybrid Modes of Operation Description .
  2. Ignition ON, verify the scan tool hood position parameter displays OPEN.
  3. Ignition OFF, disconnect the affected fuel injector harness connector at the fuel injector.
  4. Ignition ON, verify that a test lamp illuminates between the ignition 1 voltage circuit terminal A and ground.
    • If the test lamp does not illuminate, test the ignition 1 voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition 1 voltage circuit fuse is open, test or replace the fuel injector.
  5. Connect the J 34730-405  between the control circuit terminal B and the ignition 1 voltage circuit terminal A.
  6. Command the fuel injector ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
    • If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the engine control module (ECM).
    • 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 ECM.
  7. If all circuits test normal, test or replace the fuel injector.
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