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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1176 (Instrument Panel, Gages, And Console) >> Diagnostic Information and Procedures >> DTC P1431 (Without FFS): No Change In Right Fuel Tank Fuel Level Over Distance >> Test Description

Test Description

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

  1. This step determines if a circuit condition is causing the fuel level signal to be at a fixed value.
  2. This step determines if a circuit condition is causing the fuel level signal to be at a fixed value.
  3. This step determines if fuel is being delivered to the right fuel tank jet pump.

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

  4. This step verifies that the left fuel level sender voltage is not above the specified value. If the left fuel level sender voltage is above the specified value, the left fuel tank will have to be drained.
  5. Drain the left fuel tank until the left fuel sender voltage is within the specified range in order to keep fuel from leaking from the left fuel tank.
  6. This step determines if fuel is being transferred to the left fuel tank.

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

  7. Foreign material in the fuel tank may cause the sensor to stick. Inspect the strainer for interfering with the float arm. A stuck sensor may not be apparent when the sensor is removed from the fuel tank. The following may have caused the DTCs to set:
    • The fuel tanks over filled.
    • Fuel level that is almost empty and then re-fueled with only a couple gallons.
    • The fuel level sensor un-stuck while re-fueling.
    • The fuel level sensor un-stuck on rough road or going around a corner.
  8. The PCM will not reset the mileage for this diagnostic if the fuel tanks are re-fueled to the same level as before the repair was made. Perform the following procedure in order to re-fuel the vehicle after replacing a sending unit or fuel tank.
    • Add 25 percent of the fuel that you removed before the repair.
    • Start and idle the engine for 5 minutes.
    • Turn OFF the engine.
    • Add the remainder of the fuel.
      Fig 1: DTC P1431 (Without FFS) (1 Of 3)
      G01453759Courtesy of GENERAL MOTORS CORP.
Fig 2: DTC P1431 (Without FFS) (2 Of 3)
G01453760Courtesy of GENERAL MOTORS CORP.
Fig 3: DTC P1431 (Without FFS) (3 Of 3)
G01453761Courtesy of GENERAL MOTORS CORP.
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