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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 P0010 To DTC P0231/P025A >> DTC P025A >> Circuit/System Testing
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Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the K27 fuel pump control module.
  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 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 voltage. If the circuit tests normal, replace the K20 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 K20 ECM.
  4. If all circuits test normal, replace the K27 fuel pump control module.
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