With FFS
DTC P1431 (W/FFS)CIRCUIT DESCRIPTION
The right fuel level sensor measures fuel level changes within the right fuel tank.
When the fuel level is high the sensor signal voltage is high. When the fuel level is low the sensor signal voltage is low.
The powertrain control module (PCM) uses inputs from the left fuel level sensor and the right fuel level sensor in order to calculate the total fuel remaining in both fuel tanks. The PCM sends this information via class 2 to the IPC.
This diagnostic tests for a stuck right fuel level sensor 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 RUNNING THE DTC
The engine is operating.
CONDITIONS FOR SETTING THE DTC
- The secondary fuel tank is not empty.
- More than 241 km (150 mi) have been accumulated.
- The PCM does not detect that the fuel level in the right fuel tank has not changed by at least 3.0 liters (0.80 gallons).
OR
- The secondary fuel tank is not empty.
- The primary fuel tank is not full.
- Engine operating greater than 60 minutes.
- The primary tank does not achieve the top of its range. Observe, after operating the engine for greater than 60 minutes the fuel in the right fuel tank will transfer to the left fuel tank.
OR
- The secondary fuel tank is empty.
- The primary fuel tank is full.
- The fuel level in both fuel tanks does not change after traveling more than 284 km (200 mi).Observe, if the secondary fuel tank is empty, the primary fuel level should decrease after 284 km (200 mi).
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.
- The vehicle fuel gage displays empty.
- The check gages indicator illuminates.
- The driver information center displays the LOW FUEL message.
CONDITIONS FOR CLEARING THE MIL OR DTC
- A history DTC will clear after 40 consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic.
- A last test failed, ore current DTC, will clear when the diagnostic runs and does not fail.
- Use a scan tool in order to clear the MIL or DTC.
DIAGNOSTIC AIDS
IMPORTANT: When inspecting for a deformed or warped fuel tank, measure the resistance of the suspect fuel level sensor at empty, with the sensor in the fuel tank,and again with the sensor removed from the fuel tank. The measured resistance values should be the same at empty. If the measured values are not the same, refer to Fuel Tank Replacement (Right)Fuel Tank Replacement (Left)Fuel Tank Replacement (Right W/FFS)Fuel Tank Replacement (Left W/FFS) in Computers and Control Systems.
Depending on the current fuel level, it may be difficult to locate a malfunctioning sending unit. The malfunction may only occur when the fuel level is full or near empty. The fuel sending unit may need to be removed for further diagnosis. A fuel level sensor that has an intermittent condition causes this DTC to set.Remove the fuel level sensor. Refer to Fuel Sender Assembly Replacement (W/O FFS)Fuel Sender Assembly Replacement (RH W/FFS)Fuel Sender Assembly Replacement (LH W/FFS) in Computers and Control Systems in order to test the resistance of the sensor. The resistance of the sensor should change from 40 to 250 ohms.Replace the sensor if the resistance did not change or was out of range.
The following occurs with this DTC set:
- The vehicle fuel gage displays empty.
- The check gages indicator illuminates.
- The driver information center displays a message.
- If the fuel level sensor is operating OK, test the operation of the Jet Pump and the transfer function.
If DTC P0461 is also set refer to DTC P0461 (Without FFS)DTC P0461 (W/FFS). Without FFS With FFS
TEST
