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Home >> Cadillac >> 2009 >> Escalade Base, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 17 (Engine Control System & Fuel - Hybrid (Hp2) 6.0L (LFA) - DTC P1255 To DTC P3449) >> DTC P2635 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
  1. Verify that DTCs P0192, P0193, P0231, P0232, or P023F are not set.
  2. Ignition OFF, disconnect the harness connector at the fuel tank pump module.
  3. Ignition ON, test for less than 5.0 ohms between the fuel pump module low reference circuit terminal A and ground.
    • If greater than the specified range, test the fuel pump module low reference circuit for a high resistance. If the circuit tests normal, replace the FPCM.
  4. Ignition OFF, install a test lamp between the control circuit terminal D and the control circuit terminal A.
  5. Ignition ON, command the fuel pump ON and OFF using a 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 FPCM.
    • 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 FPCM.
  6. If all circuits test normal, perform the Fuel System Diagnosis to verify proper fuel pressure.
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