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Home >> Buick >> 2002 >> Regal LS >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Self-Diagnostics - 3.8L >> Diagnostic Tests >> DTC P0230: Fuel Pump Control Circuit >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform Diagnostic System Check - Engine Controls. See DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM. After performing Diagnostic System Check - Engine Controls, go to next step.
  2. Turn ignition on, engine off. Using scan tool, command fuel pump on and off. Does the fuel pump relay turn ON and OFF with each command? If yes, go to next step. If no, go to step  4.
  3. Observe FREEZE FRAME/FAILURE RECORDS data for this DTC. Turn ignition off for 30 seconds. Start engine. Operate vehicle within Conditions for Running DTC or as close to FREEZE FRAME/FAILURE RECORDS data as possible. Does the DTC fail this ignition cycle? If yes, go to next step. If no, see INTERMITTENT CONDITIONS  under SELF-DIAGNOSTIC SYSTEM.
  4. Turn ignition off. Disconnect fuel pump relay. Turn ignition on, engine off. Using a test light connected to ground, probe Dark Green/White wire of fuel pump relay connector. Using scan tool, command fuel pump on and off. Does the test lamp turn on and off with each command? If yes, go to next step. If no, go to step  6.
  5. Connect a test light between Dark Green/White wire, and Black/White wire or Black wire of fuel pump relay connector. Using scan tool, command fuel pump on and off. Does the test lamp turn on and off with each command? If yes, go to step  9. If no, go to step  11.
  6. Does the test lamp remain illuminated with each command? If yes, go to step  8. If no, go to next step.
  7. Test the control circuit of the fuel pump relay for a short to ground or an open. Did you find and correct the condition? If yes, go to step  14. If no, go to step  10.
  8. Test the control circuit of the fuel pump relay for a short to voltage. Did you find and correct the condition? If yes, go to step  14. If no, go to step  10.
  9. Check fuel pump relay connector for poor connections at the fuel pump relay. Did you find and correct the condition? If yes, go to step  14. If no, go to step  12.
  10. Check PCM connectors for poor connections at the harness connectors of the PCM. Did you find and correct the condition? If yes, go to step  14. If no, go to step  13.
  11. Repair the ground circuit of the relay. After repairs, go to step  14.
  12. Replace fuel pump relay. After repairs, go to step  14.
  13. Replace PCM. Program replacement PCM. See POWERTRAIN CONTROL MODULE  under PROGRAMMING. After repairs, go to next step.
  14. Using scan tool, clear DTCs. Turn ignition off for 30 seconds. Start engine. Operate vehicle within Conditions for Running DTC. Does DTC run and pass? If yes, go to next step. If no, go to step  2.
  15. Using scan tool, observe stored information. Does scan tool displays any DTCs that have not been diagnosed? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, system is okay.
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