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Home >> GMC >> 1998 >> Forward Control 4.3 W, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 4.3L >> Diagnostic Trouble Codes >> DTC P0461 - Fuel Level Sensor Circuit Performance >> Diagnostic Procedures
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Diagnostic Procedures

  1. Perform POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK . Retrieve and record FREEZE FRAME and/or FAIL RECORDS data for each DTC set. After performing OBD system check, go to next step.
  2. Turn ignition on, with engine off. Using scan tool, compare fuel level on scan tool and vehicle fuel gauge. If fuel levels are about the same, go to next step. If fuel level on scan tool and fuel gauge is not the same, go to step 4).
  3. DTC is intermittent. Check for additional DTCs set. Diagnose affected DTCs. If no additional DTCs are set, see DIAGNOSTIC AIDS.
  4. Turn ignition off. Disconnect fuel level sending unit harness connector at fuel tank. Turn ignition on, engine off. Using DVOM, check voltage between ground and fuel level signal circuit at harness connector. If voltage reading is about 5 volts, go to step 6). If voltage reading is not about 5 volts, go to next step.
  5. Repair open or short to ground in fuel level sender signal circuit. After repairs, go to step 9).
  6. Check fuel level sending unit for corrosion, faulty terminal connector, proper alignment to tank or for restricted/binding fuel level float. If problem is found, go to next step. If no problem is found, go to step 8).
  7. Repair as necessary. After repairs, go to step 9).
  8. Replace fuel level sending unit. After replacing sender, go to next step.
  9. Using scan tool, record fuel level sensor voltage. Change fuel level in vehicle. If sensor voltage changes, go to next step. If sensor voltage does not change, repeat step 2).
  10. Using scan tool, select Read and Record INFO, REVIEW INFO function. If any undiagnosed DTCs are displayed, diagnose affected DTCs. If no DTCs are displayed, system is okay.
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