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DTC P0460: Fuel Level Unit No Change Over Miles: Testing

WARNING: Fuel system is under constant pressure even when ignition is off. Open fuel system with caution.
    NOTE: Diagnose DTC P0462 or P0463 first, if set along with P0460. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . Inspect the Fuel Pump Module harness connector for any corrosion or damage.
  1. Turn the ignition on. With the DRBIII®, read DTCs. Is the Good Trip counter displayed and equal to zero? If yes, go to next step. If no, go to step  8.
  2. Visually inspect the Fuel Tank for damage that may restrict the Fuel Sending Unit float from moving. Is the Fuel Tank okay? If yes, go to next step. If no, replace the Fuel Tank as necessary.
  3. Turn the ignition off. Disconnect the Fuel Pump Module harness connector. Measure the resistance of the Fuel Level Sensor Signal circuit in the Fuel Pump Module harness connector to ground. Is the resistance below 100 ohms? If yes, repair the Fuel Level Sensor Signal circuit for a short to ground. If no, go to next step.
  4. Turn the ignition off. Disconnect the instrument cluster C2 10-pin harness connector. Measure the resistance of the Fuel Level Sensor Signal circuit between the Fuel Pump Module harness connector and the instrument cluster C2 harness connector. Is the resistance below 5.0 ohms? If yes, go to next step. If no, repair the Fuel Level Sensor Signal circuit for an open.
  5. Measure the resistance of the Ground circuit in the Fuel Pump Module harness connector to ground. Is the resistance below 5.0 ohms? If yes, go to next step. If no, repair the Ground circuit for an open.
    6. WARNING: The fuel system is under a constant pressure even with the engine off. Before opening the fuel system the fuel pressure must be release.
  6. Release fuel pressure. See FUEL SYSTEM PRESSURE RELEASE . Remove the Fuel Tank. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. Remove the Fuel Pump Module. Visually inspect the inside of the Fuel Tank for any obstructions or deformities. Inspect the Fuel Pump Module Float arm for damage. Were any problems found? If yes, repair or replace as necessary. If no, go to next step.
  7. There are no possible causes remaining, replace the Fuel Level Sensor.
    8. WARNING: When the engine is operating, do not stand in a direct line with the fan. Do not put your hands near the pulleys, belts or fan. Do not wear loose clothing.
  8. The conditions that set the DTC are not present at this time. The following may help in identifying the intermittent condition. Physically and visually inspect the fuel tank for damage. If a problem is found, repair or replace as necessary. With the engine running at normal operating temperature, monitor the DRBIII® parameters related to the DTC while wiggling the wiring harness. Look for parameter values to change and/or a DTC to set. Review the DRBIII® Freeze Frame information. If possible try to duplicate the conditions under which the DTC was set. Refer to any Technical Service Bulletins (TSB) that may apply. Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or partially broken wires. Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals. Were any of the above conditions present? If yes, repair as necessary. If no, test is complete.
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