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Home >> Buick >> 2001 >> 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 powertrain diagnostic system check. See POWERTRAIN DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing powertrain diagnostic system check, go to next step.
  2. Turn ignition on, engine off. Using scan tool, command fuel pump on and off. If fuel pump relay turns on and off with each command, go to next step. If fuel pump relay does not turn on and off with each command, 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 code enable criteria or as close to FREEZE FRAME/FAILURE RECORDS data as possible. If this DTC failed this ignition cycle, go to next step. If this DTC did not fail this ignition cycle, see INTERMITTENT TROUBLE CODE DETERMINATION  under ON-BOARD DIAGNOSTICS 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. If test light turns on and off with each command, go to next step. If test light does not turn on and off with each command, 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. If test light turns on and off with each command, go to step  9. If test light does not turn on and off with each command, go to step  11.
  6. If test light remains on with each command, go to step  8. If test light does not remain on with each command, go to next step.
  7. Check Dark Green/White wire between fuel pump relay and PCM for short to ground or open. If problem was found, repair as necessary. After repairs, go to step  14. If problem was not found, go to step  10.
  8. Check Dark Green/White wire between fuel pump relay and PCM for short to voltage. If problem was found, repair as necessary. After repairs, go to step  14. If problem was not found, go to step  10.
  9. Check fuel pump relay connector for poor connections. at the fuel pump relay. If problem was found, repair as necessary. After repairs, go to step  14. If problem was not found, go to step  12.
  10. Check PCM connectors for poor connections at the harness connectors of the PCM. If problem was found, repair as necessary. After repairs, go to step  14. If problem was not found, go to step  13.
  11. Repair Black/White wire or Black wire between fuel pump relay and ground. 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 code enable criteria. If DTC runs and passes, go to next step. If DTC does not run and pass, go to step  2.
  15. Using scan tool, observe stored information. If scan tool displays any DTCs that have not been diagnosed, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If scan tool does not display any DTCs, system is okay.
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