P0461

Diagnostic Chart (Part 1 Of 2):

Diagnostic Chart (Part 2 Of 2):

Schematic:

CIRCUIT DESCRIPTION
The fuel level sensor is a device used to determine the level of fuel in the tank. The PCM applies an ignition voltage to the sensor. The sensor varies the voltage based on the level of fuel in the tank. When the tank is full, the sensor resistance is high, and the PCM senses a high signal voltage. As the fuel level in the tank decreases, the sensor resistance drops, and the signal voltage at the PCM is pulled low. The PCM uses the fuel level input to run certain system tests. Some of these system tests include the following:
^ EVAP system tests
^ Misfire tests
^ Oxygen sensor tests

The PCM also sends the fuel level information via class 2 serial data to the Instrument Panel Cluster (IPC). The PC uses the information to control the fuel gauge.

The PCM monitors the fuel level sensor to detect a fixed signal voltage. The PCM checks for a change in signal voltage (tank volume) over a calibrated distance. If the signal voltage indicates that the change in tank volume is less than the calibrated amount, the PCM will set DTC P0461.

CONDITIONS FOR RUNNING THE DTC
^ VSS DTCs are not set.
^ The engine is running.
^ System voltage is between 11-16 volts.
^ Vehicle speed is more than 5 km/h (3.1 mph).

CONDITIONS FOR SETTING THE DTC
The fuel level sensor voltage indicates that tank volume has not changed over a distance of 60 kilometers (37.5 miles).

ACTION TAKEN WHEN THE DTC SETS
^ The PCM will not illuminate the Malfunction Indicator Lamp (MIL).
^ The PCM will store the conditions present when the DTC set as Fail Records data only.

CONDITIONS FOR CLEARING THE MIL/DTC
^ The history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.
^ The DTC can be cleared by using the scan tool Clear DTC Information function.

DIAGNOSTIC AIDS

IMPORTANT: Fuel level is used to determine EVAP system diagnosis. Always diagnose the fuel level sensor before any other EVAP system components or DTCs.

Refer to Instrument Cluster Operation in Instrument Panel, Gauges, and Console for additional diagnostic information.

If the condition is intermittent, refer to Intermittent Conditions. Intermittent Conditions