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Home >> Pontiac >> 1998 >> Firebird Formula, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Tests W/Codes - 5.7L >> Diagnostic Trouble Codes >> DTC P0230 - Fuel Pump Control Circuit >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK , then 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 5).
  3. Turn ignition off. Disconnect PCM harness connector. Turn ignition on. Using DVOM on 10-amp scale, check current between battery positive and PCM connector (harness side), fuel pump relay control circuit. If current is less than .75 amp (but not zero), see DIAGNOSTIC AIDS. If not, go to next step.
  4. Turn ignition off. Remove fuel pump relay. Using DVOM, check resistance between ground and PCM connector (harness side), fuel pump relay control circuit. If resistance is infinite, go to step 11). If resistance is not infinite, go to step 10).
  5. Turn ignition off. Remove fuel pump relay. Connect a test light between fuel pump relay connector terminals No. 85 and 86. Turn ignition on. Using scan tool, command fuel pump relay on and off. If test light turns on and off as commanded, go to step 8). If test light does not turn on, go to step 7).
  6. Check resistance between fuel pump ground circuit at underhood relay block to battery ground. If resistance is 0-5 ohms, go to next step. If resistance is not 0-5 ohms, go to step 9).
  7. Turn ignition off. Install fuel pump relay. Disconnect PCM harness connector. Turn ignition on, engine off. Connect a fused jumper wire between battery positive and PCM connector (harness side), fuel pump relay control circuit. If relay operates, go to step 12). If relay does not operate, go to step 10).
  8. Check connections at fuel pump relay. Repair as necessary. After repairs, go to step 13). If connections are okay, go to step 11).
  9. Repair open in fuel pump relay ground circuit. After repairs, go to step 13).
  10. Repair faulty relay control circuit as necessary. After repairs, go to step 13).
  11. Replace fuel pump relay. After replacing relay, go to step 13).
  12. Replace PCM. Program replacement PCM using required equipment. After repair is completed, go to next step.
  13. Using scan tool, select DTC, CLEAR INFO function. Start and warm engine to normal operating temperature. Select DTC, SPECIFIC, then enter DTC P0230. 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).
  14. Using scan tool, select CAPTURE INFO, REVIEW INFO function. If any undiagnosed DTC(s) are displayed, go to applicable DTC test.
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