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Home >> Cadillac >> 2009 >> Escalade Base, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 14 (Engine Control System & Fuel - Hybrid (Hp2) 6.0L (LFA) - DTC P025A To DTC P0700) >> DTC P025A >> 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 FPCM.
  2. Ignition OFF, connect a test lamp between the control circuit terminal 13 and ground.
  3. Ignition ON, command the fuel pump ON and OFF using the scan tool ECM fuel pump output control. 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 voltage. If the circuit tests normal, replace the ECM.
    • If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
  4. If all circuits test normal, replace the FPCM.
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