DTC P1432 Without 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 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.
The left tank fuel pump also supplies a small amount of pressurized fuel to the right fuel tank siphon jet pump through the auxiliary fuel feed rear pipe. The pressurized fuel creates a venturi action inside the siphon jet pump. The venturi action causes the fuel to be drawn out of the right fuel tank. Fuel is then transferred from the right fuel tank to the left fuel tank through the auxiliary fuel return rear pipe. The fuel system is designed to maintain a greater level in the left fuel tank then the right fuel tank when the electric fuel pump is operating. The fuel transfer rate from the left fuel tank to the right fuel tank is less than the transfer rate from the right fuel tank to the left fuel tank. Therefore, with the electric fuel pump operating, the left fuel tank level should be higher than the right fuel tank level.
The fuel level in the fuel tanks equalize when the following occur:
| • | The electric fuel pump is not operating. |
| • | The fuel level is greater than 50 percent. |
Conditions for Running the DTC
The engine is operating.
Conditions for Setting the DTC
| • | The fuel level sensor voltage is below 0.39 volts. |
| • | The above conditions present for greater than 2.0 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. |
| • | The vehicle fuel gage displays empty. |
| • | The check gage indicator illuminates. |
| • | The driver information center displays a 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 resistance values should be the same empty. If the measured resistance values are not the same, refer to Fuel Tank Replacement in Engine Controls.
| • | 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 in Engine Controls 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. |
| • | If the fuel level sensor is operating OK, test the operation of the Jet Pump. |
| • | For an intermittent condition, refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems. |
The voltages in the Fuel Level Conversion Table are approximate values. Use this table to aid in diagnosis.
Test Description
The numbers below refer to the step numbers on the Diagnostic Table.
Step | Action | Values | Yes | No |
|---|---|---|---|---|
Schematic Reference: Instrument Cluster Schematics | ||||
1 | Did you perform the IPC Diagnostic System Check ? | -- | Go to Step 2 | |
Is the Fuel Level sensor voltage below the specified value? | 0.39 V | Go to Step 4 | Go to Step 3 | |
3 |
Does the scan tool indicate that this diagnostic failed this ignition? | -- | Go to Step 4 | Go to Diagnostic Aids |
4 |
Is the Fuel Level sensor voltage below the specified value? | 0.39 V | Go to Step 5 | Go to Step 7 |
5 |
Is the Fuel Level sensor signal circuit grounded ? | -- | Go to Step 6 | Go to Step 8 |
6 | Repair the grounded fuel level signal circuit between the PCM connector and the fuel level sensor. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 9 | -- |
7 | Replace the fuel level sensor. Refer to Fuel Sender Assembly Replacement in Engine Controls. Did you complete the replacement? | -- | Go to Step 9 | -- |
8 |
Important: Program the replacement PCM. Replace the PCM. Refer to Powertrain Control Module Replacement in Engine Controls. Did you complete the replacement? | -- | Go to Step 9 | -- |
9 |
Does the scan tool indicate that this test ran and passed? | -- | Go to Step 10 | Go to Step 2 |
10 | Select the Capture Info option and the Review Info option using the scan tool. Does the scan tool display any DTCs that you have not diagnosed? | -- | Go to the applicable DTC | System OK |
