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Home >> Chevrolet >> 1998 >> Astro Van Cargo, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Diagnostic Trouble Codes >> DTC P0461 - Fuel Level Sensor Circuit Malfunction >> Diagnostic Procedures

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, record fuel level sensor voltage. Change fuel level in fuel tank. Observe fuel level sensor voltage on scan tool. If fuel level sensor voltage changed on scan tool, go to next step. If fuel level sensor voltage did not change on scan tool, go to step 4).
  3. DTC is intermittent. Check if additional DTCs are set. diagnose affected DTCs. If no additional DTCs are set, see DIAGNOSTIC AIDS.
  4. Turn ignition off. Locate and disconnect fuel level sensor harness connector in fuel tank. Turn ignition on, engine off. Using DVOM connected to ground, probe fuel level sensor signal circuit. 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 signal circuit. After repairs, go to step 9).
  6. Check fuel level sensor for corrosion and proper mating at connector. Check for proper alignment in fuel tank. check for restricted/binding level float. If a 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 sender. After replacing sender, go to next step.
  9. Using scan tool, record fuel level sensor voltage. Change fuel level in fuel tank. If fuel level sensor voltage changes, go to next step. If fuel level sensor voltage does not change, repeat step 2).
  10. Using scan tool, display CAPTURE and REVIEW INFO function. If any undiagnosed DTCs are displayed, diagnose affected DTCs. If no additional DTCs are displayed, system is okay.
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