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Home >> Chevrolet >> 2009 >> Traverse LS, AWD >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System & Fuel System - 3.6L - DTC P0638 To DTC P2635 >> DTC P2635 >> Circuit/System Testing

Circuit/System Testing

IMPORTANT: Verify that DTC P0192, P0193, P0231, P0232, or P023F are not set as current or history before performing this diagnostic. If any of those codes are set as current or history, go to DTC P0192 or P0193 (ECM) or DTC P0192 or P0193 (FPCM)DTC P0231, P0232, or P023F .
  1. Ignition OFF, disconnect the harness connector at the fuel tank pump module.
  2. Ignition ON, test for 5.0 ohm or less between the fuel pump module low reference circuit terminal 2 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.
  3. Ignition OFF, install a test lamp between the control circuit terminal 1 and the control circuit terminal 2.
  4. 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 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.
  5. Perform the Fuel System Diagnosis to verify proper fuel pressure.
    • If the fuel pressure is not normal, replace the fuel tank fuel pump module.
  6. If the fuel system components test normal, refer to Symptoms - Engine Controls .
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