P0463

Diagnostic Chart (Part 1 Of 2):

Diagnostic Chart (Part 2 Of 2):

Schematic:

CIRCUIT DESCRIPTION
The Powertrain Control Module (PCM) uses a fuel level input in order to calculate the expected vapor pressures within the fuel system. These vapor pressure vary as the fuel level changes. The vapor pressure is critical in determining if the Evaporative Emission (EVAP) system is operating properly. The PCM also uses the fuel level in order to determine if the fuel level is too high or too low to be able to accurately detect an EVAP system malfunction.

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

CONDITIONS FOR SETTING THE DTC
The fuel level sensor reading is more than 98 percent for 25 seconds or more.

ACTION TAKEN WHEN THE DTC SETS
^ The PCM will record the operating conditions under which the diagnostic fails. This information is stored in the Failure Records buffer.
^ A history DTC is stored.

CONDITIONS FOR CLEARING THE DTC
^ A history DTC clears after 40 consecutive warm up cycles without a fault.
^ Use a scan tool to clear the DTCs.

DIAGNOSTIC AIDS
^ Inspect for the following conditions that may cause intermittents:
- Faulty electrical connections
- Rubbed-through wire insulation
- A broken wire inside the insulation
^ Thoroughly inspect any circuitry that is suspected of causing the intermittent complaint. Inspect for the following conditions:
- Backed-out terminals
- Improper mating
- Broken locks
- Improperly formed or damaged terminals
- Faulty terminal-to-wire connections
^ Before replacing the PCM, inspect the PCM electrical connector terminals for the following conditions:
- Improper mating
- Broken locks
- Physical damage to the wiring harness

TEST DESCRIPTION
The numbers below refer to the step numbers on the diagnostic table:
2. This step determines if the malfunction is present.
3. Using the Freeze Frame and/or Failure Records data may aid in locating an intermittent condition. If you cannot duplicate the DTC, the information included in the Freeze Frame and/or Failure Records data can help to determine how many miles since the DTC set. The Fail Counter and Pass Counter can also help 10 determine how many ignition cycles the diagnostic reported a pass and/or fail. Operate the vehicle within the same freeze frame conditions such as RPM, load, vehicle speed, temperature, or other conditions that you observed. This will isolate when the DTC failed.
4. Use the connector test adapter kit in order to avoid damage to the harness connector terminals.
14. The replacement PCM must be programmed and the Crankshaft Position System Variation Learn procedure must be performed.