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Home >> Pontiac >> 2000 >> Firebird Formula, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Self-Diagnostics - 5.7L >> Diagnostic Tests >> DTC P0230: Fuel Pump Relay Control Circuit >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing OBD system check, go to next step.
  2. Install scan tool. Turn ignition on, with engine off. Using scan tool, command fuel pump relay on and off. If fuel pump relay turns on and off as commanded, go to next step. If fuel pump relay does not turn on and off as commanded, go to step  4.
  3. Using scan tool, review FREEZE FRAME and/or FAILURE RECORDS data for this DTC. Turn ignition off for 30 seconds. Start engine. Operate vehicle within the conditions for setting this DTC. If DTC resets, go to next step. If DTC does not reset, see DIAGNOSTIC AIDS 
  4. Turn ignition off. Remove fuel pump relay. Using a test light connected to battery voltage, probe coil side ground circuit of fuel pump relay. If test light illuminates, go to next step. If test light does not illuminate, go to step  11.
  5. Connect a test light between control circuit and coil side ground circuit of fuel pump relay. Using scan tool, command fuel pump relay on and off. If test light turns on and off as commanded, go to step  9. If test light does not turn on, go to next step.
  6. If test light remains illuminated, go to step  8. If test light does not remain illuminated, go to next step.
  7. Check control circuit of fuel pump relay for open or short to ground. Repair as necessary. After repairs, go to step  14. If circuit is okay, go to step  10.
  8. Check control circuit of fuel pump relay for short to voltage. Repair as necessary. After repairs, go to step  14. If circuit is okay, go to step  13.
  9. Check for poor connections at fuel pump relay. Repair as necessary. After repairs, go to step  14. If circuit is okay, go to step  12.
  10. Check for poor connections at PCM. Repair as necessary. After repairs, go to step  14. If connections are okay, go to step  13.
  11. Repair open in relay coil side ground circuit. After repairs, go to step  14.
  12. Replace fuel pump relay. After replacing relay, go to step  14.
  13. Replace PCM. Program replacement PCM using required equipment. After system is okay, go to next step.
  14. Using scan tool, select DTC, CLEAR INFO function. Start and warm engine to normal operating temperature. Select DTC, SPECIFIC, then enter this DTC. Operate vehicle within conditions for setting this DTC. If scan tool indicates that this test ran and passed, go to next step. If scan tool does not indicate that this test ran and passed, repeat step  2.
  15. Using scan tool, select CAPTURE INFO, REVIEW INFO function. If any undiagnosed DTCs are displayed, go to applicable DTC test.
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