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Home >> Chevrolet >> 2000 >> Metro Base, 2D Hatchback >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls Self-Diagnostics - 1.0L & 1.3L >> Diagnostic Tests >> DTC P0461: Fuel Level Sensor Performance >> 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. Remove rear seat cushion. Disconnect fuel tank level sensor harness connector C310. Turn ignition on, with engine off. Using DVOM, check voltage of fuel tank level sensor input circuit at connector C310 (PCM side). See WIRING DIAGRAMS article. If voltage reading is 7-8 volts go to next step. If voltage reading is not 7-8 volts, go to step  8.
  3. Reconnect fuel tank level sensor harness connector C310. Remove fuel tank. Disconnect fuel sender assembly harness connector at fuel sender. Using DVOM connected to ground, check voltage of fuel tank level sensor input circuit at connector C310 (PCM side). See WIRING DIAGRAMS article. If voltage reading is 7-8 volts, go to next step. If voltage reading is not 7-8 volts, go to step  8.
  4. Check for proper ground connection at fuel tank. Repair as necessary. After repairs, go to step  14. If ground connection is okay, go to next step.
    NOTE: Ensure any fuel level DTCs are cleared to avoid an incorrect fuel level reading.
  5. Remove fuel tank level sensor from fuel tank. Reconnect fuel sender assembly electrical connector. Using scan tool, monitor fuel tank level sensor parameter while moving sensor float from empty to full, and then back to empty several times. If fuel tank level sensor value increases to 90 percent, and then decreases steadily to zero percent as float is moved, see DIAGNOSTIC AIDS . If fuel tank level sensor value is erratic or does not change, go to next step.
  6. Fuel gauge responds slowly to changes in position of fuel tank level sensor float. Observe fuel gauge on instrument cluster while moving sensor float from empty to full, and then back to empty several times. If fuel gauge responds accordingly as float is moved, go to step  12. If fuel gauge does not respond, go to step  9.
  7. Check for an open or short in fuel tank level sensor input circuit between connector C310, located under rear seat cushion, and PCM. Repair as necessary. After repairs, go to step  14. If circuit is okay, go to step  10.
  8. Repair open or short in fuel tank level sensor input circuit between connector C310, located under rear seat cushion, and fuel tank level sensor. After replacing sensor, go to step  14.
  9. Replace fuel tank level sensor. After replacing sensor, go to step  14.
  10. Turn ignition off. Leave fuel tank level sensor harness electrical connector C310 disconnected. Disconnect PCM 22-pin harness connector. Turn ignition on, with engine off. Using DVOM, check voltage of fuel tank level sensor input circuit at PCM 22-pin connector (harness side). See WIRING DIAGRAMS article. If voltage reading is 7-8 volts, go to step  13. If voltage reading is not 7-8 volts, go to next step.
  11. Check for an open or short in fuel tank level sensor input circuit between instrument cluster fuel gauge and PCM. Repair as necessary. After repairs, go to step  14. If circuit is okay, diagnose instrument cluster as necessary. See appropriate INSTRUMENT PANELS article in ACCESSORIES & EQUIPMENT.
  12. Check for an open in fuel tank level sensor input circuit between instrument cluster fuel gauge and PCM. Repair as necessary. After repairs, go to step  14. If circuit is okay, go to next step.
  13. Replace PCM. Program replacement PCM using required equipment. After replacing PCM, go to next step.
  14. After repairs, using scan tool, clear DTC information. Road test vehicle within freeze frame conditions that set DTC. Check for DTCs. If no DTCs are stored, repair is complete. If any DTCs are stored, diagnose DTC(s).
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