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Home >> Chevrolet >> 2000 >> Astro Van Cargo, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls Self-Diagnostics - 4.3L >> Diagnostic Tests >> DTC P0461: Fuel Level Sensor Circuit Malfunction >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing OBD system check, go to next step.
  2. Check if DTCs P0462 and P0463 are also set. Diagnose affected DTC(s). If DTCs P0462 and P0463 are not set, turn ignition on. Disconnect fuel level sensor harness connector at fuel tank. Turn ignition on, with engine off. Using scan tool, monitor fuel level sensor voltage. If fuel level sensor voltage is about 5 volts, go to next step. If fuel level sensor voltage is not about 5 volts, go to step  4.
  3. Using a jumper wire, jumper fuel level sensor harness connector signal and ground circuits together. Using scan tool, monitor fuel level sensor voltage. If fuel level sensor voltage is about zero volts, go to step  5. If fuel level sensor voltage is not about zero volts, go to step  6.
  4. Check for open or short to ground in fuel level signal circuit. Repair as necessary. After repairs, go to step  11. If circuit is okay, go to step  9.
  5. Check for corrosion and proper mating at harness connectors. Check for proper alignment, restricted or binding fuel level float in fuel tank. If problem is found, go to step  7. If no problem is found, go to step  8.
  6. Check fuel level signal and ground circuits for open. If circuit is open, go to next step. If circuit is okay, go to step  9.
  7. Repair as necessary. After repairs, go to step  11.
  8. Replace fuel level sensor. After replacing sensor, go to step  11.
  9. Check terminal contact at VCM. Repair as necessary. After repairs, go to step  11. If terminal contact is okay, go to next step.
  10. Replace VCM. Program replacement VCM using required equipment. After replacing VCM, go to next step.
  11. Using scan tool, clear DTCs. Start engine. Select DTC and SPECIFIC DTC function. Operate vehicle within conditions for setting this DTC, until scan tool indicates that this diagnostic ran. If scan tool indicates that this diagnostic passed, go to next step. If scan tool does not indicate that this diagnostic ran, go to step  2.
  12. 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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