P0462

CIRCUIT DESCRIPTION
The fuel level sensor changes resistance based on fuel level. The PCM monitors the signal circuit of the fuel level sensor in order to determine the fuel level. When the fuel tank is full, the sensor resistance is high and the PCM senses a high signal voltage. When the fuel tank is empty, the sensor resistance is low and the PCM senses a low signal voltage. The PCM uses the signal circuit of the fuel level sensor in order to calculate the total remaining fuel in the tank. The PCM sends the fuel level volume via the class 2 serial data circuit to the instrument cluster in order to control the fuel gage. The fuel level information is also used for misfire and EVAP diagnostics.

CONDITIONS FOR RUNNING THE DTC
^ The ignition is ON.
^ The system voltage is between 11 volts and 16 volts.

CONDITIONS FOR SETTING THE DTC
^ The fuel level signal is less than 0.4 volts or 2 percent.
^ The above condition is present for greater than 20 seconds.

ACTION TAKEN WHEN THE DTC SETS
^ The fuel gage defaults to empty.
^ The low fuel indicator illuminates.
^ The PCM records the operating conditions at the time the diagnostic fails. The PCM displays the failure information in the Failure Records on the scan tool.

CONDITIONS FOR CLEARING THE DTC
^ The DTC becomes history when the conditions for setting the DTC are no longer present.
^ The history DTC clears after 40 malfunction free warm-up cycles.
^ The PCM receives the clear code command from the scan tool.

DIAGNOSTIC AIDS
Use the Freeze Frame and/or Failure Records data in order to locate an intermittent condition. If you cannot duplicate the DTC, the information included in the Freeze Frame and/or Failure Records data may aid in determining the number of miles since the DTC set. The Fail Counter and Pass Counter can also aid in determining the number of ignition cycles that the diagnostic reported a pass and/or fail. Operate the vehicle within the same freeze frame conditions RPM, engine load, vehicle speed, temperature, etc. This will isolate when the DTC failed.

Refer to Diagnostic Aids for Circuit Testing and Wiring Repair procedures.

TEST DESCRIPTION

Steps 1-3:

Steps 4-10:

The number below refers to the step number on the diagnostic table.
3. Tests for the proper operation of the circuit in the high voltage range.