P1431

Electrical Diagram:

CIRCUIT DESCRIPTION

The Fuel Level sensor 2, mounted in the rear side of the right fuel tank, measures fuel level changes within the right fuel tank. The Fuel Level sensor 2 has a 5.0 volt reference circuit, a ground, and a signal circuit.

When the fuel level is low the sensor output voltage is high. When the fuel level is high the sensor output voltage is low. The PCM uses inputs from the Fuel Level sensor 1 and the Fuel Level sensor 2 in order to calculate the total fuel remaining in both fuel tanks. The system sends this information via the serial data to the BCM. This information displays on the fuel gauge. This diagnostic checks for a stuck Fuel Level sensor 2 signal. If the PCM determines that the fuel level (right tank) signal appears to be stuck based on a lack of signal variation expected during normal operation, this DTC sets.

CONDITIONS FOR SETTING THE DTC

^ The engine operating.

^ The PCM determines that the Fuel Level sensor 2 voltage is not consistent with the Fuel Level sensor 1 voltage for 40 minutes.

OR

^ The Fuel Level sensor voltage input to the PCM is unchanged for 40 minutes.


ACTION TAKEN WHEN THE DTC SETS

^ The PCM stores the DTC information into memory when the diagnostic runs and fails.

^ The Malfunction Indicator Lamp (MIL) will not illuminate.

^ The PCM records the operating conditions at the time the diagnostic fails. The PCM stores this information in the Failure Records.

CONDITIONS FOR CLEARING THE MIL/DTC

^ A History DTC will clear after forty consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic.

^ A last test failed (Current DTC) will clear when the diagnostic runs and does not fail.

^ The PCM battery voltage is interrupted.

^ Use a scan tool in order to clear the MIL/DTC.


DIAGNOSTIC AIDS

The following occurs with this DTC set:

^ The vehicle fuel gauge displays empty.

^ The Check Gauge lamp illuminates.

^ The Driver Information Center displays a message.

If the Fuel Level sensor is operating OK, check the operation of the Jet Pump.

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 determine how many miles since the DTC set. The Fail Counter and Pass Counter can also help determine how many ignition cycles the diagnostic reported a pass and/or a fail. Operate vehicle within the same freeze frame conditions (RPM, load, vehicle speed, temperature etc.) that you observed. This will isolate when the DTC failed. For an intermittent condition, refer to Symptoms. Testing and Inspection

TEST DESCRIPTION

The numbers below refer to the step numbers on the diagnostic table.

2. This step determines if the fault is present.

4. The fuel pump will run for 2 seconds each time it is commanded ON with the scan tool. The fuel pump will have to be enabled several times to achieve the time specified in the diagnostic table.

5. The fuel pump will run for 2 seconds each time it is commanded ON with the scan tool. The fuel pump will have to be enabled several times to achieve the time specified in the diagnostic table.

6. Foreign material in the fuel tank could cause the sensor to stick.