FixVault
Home › Saab › 2011 › 9-4X Aero › Repair and Diagnosis › Engine Performance › Engine Management And Fuel System, V6 › Fault diagnosis, fault codes › DTC P2635: Fuel Pump Flow Performance › Circuit/System Testing

Circuit/System Testing

  1. Verify that DTCs P018C, P018D, P0231, P0232, or P023F are not set.
    NOTE: Do not replace K27 fuel pump control module based on DTC P2635 in History. DTC P2635 can be stored without a fault in the fuel pump control module. See STRATEGY BASED DIAGNOSTICS .
  2. If the DTC is set, refer to Engine Management And Fuel System, V6 DTC Index .
  3. Ignition OFF, disconnect the harness connector at the G12 fuel pump.
  4. Ignition ON, test for less than 5.0 Ω between the G12 fuel pump low reference circuit terminal B and ground.
  5. If greater than the specified range, test the G12 fuel pump low reference circuit for a high resistance. If the circuit tests normal, replace the K27 fuel pump control module.
  6. Ignition OFF, install a test lamp between the control circuit terminal A and the low reference circuit terminal B.
  7. Ignition ON, command the Fuel Pump Relay ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
  8. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K27 fuel pump control module.
  9. 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 K27 fuel pump control module.
  10. Perform the FUEL SYSTEM DIAGNOSIS (LF1 CHINA) ; FUEL SYSTEM DIAGNOSIS (LF1 EXCEPT CHINA) ; FUEL SYSTEM DIAGNOSIS (LAU CHINA)  or FUEL SYSTEM DIAGNOSIS (LAU EXCEPT CHINA)  to verify proper fuel pressure.
  11. If the fuel pressure is not normal, replace the G12 fuel pump
  12. If all circuits test normal, replace the K27 fuel pump control module.
About FixVault