P0462-FUEL LEVEL SENSOR 1 CIRCUIT LOW
P0462-FUEL LEVEL SENSOR 1 CIRCUIT LOW
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For a complete wiring diagram, refer to the Wiring Information.
Theory of Operation
The Fuel Level Sensor information is a bussed message to the Powertrain Control Module (PCM) from the Totally Integrated Power Module (TIPM).
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When Monitored:
Ignition on and battery voltage above 10.4 volts.
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Set Condition:
The fuel level sensor signal voltage goes below the minimum acceptable value. One Trip Fault. Three good trips to turn off the MIL.
Possible Causes |
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| CAN BUS FAILURE |
| FUEL LEVEL SENSOR CIRCUIT DTCS SET IN THE TIPM |
| FUEL TANK |
| OBSTRUCTION TO THE FUEL LEVEL SENSOR |
| POWERTRAIN CONTROL MODULE (PCM) |
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
| NOTE: | Diagnose any Communication DTCs before continuing. |
| 1. | Start the engine. |
| 2. | Allow the engine to reach normal operating temperature. |
| 3. | With the scan tool, select View DTCs. |
| NOTE: | It may be necessary to drive the vehicle to meet the conditions to set this DTC, try to repeat the conditions in which the fault originally set by reviewing the Freeze Frame data. |
Is the DTC Active or Pending at this time?
Yes
- Go To 2
No
- Perform the INTERMITTENT CONDITION diagnostic procedure. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
| 1. | Visually inspect the Fuel Tank for damage that may restrict the Fuel Sending Unit float from moving. |
Is the Fuel Tank OK?
Yes
- Go To 3
No
- Replace the Fuel Tank as necessary. (Refer to 14 - Fuel System/Fuel Delivery/TANK, Fuel - Removal) .
- Perform the POWERTRAIN VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
3. FUEL LEVEL SENSOR CIRCUIT DTCs SET IN THE TIPM
Are any Fuel Level Sensor Circuit DTCs set in the TIPM?
Yes
- Diagnose the appropriate Fuel Level Sensor Circuit DTC in the TIPM. (Refer to 28 - DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Diagnosis and Testing).
No
- Go To 4
4. INTERNAL INSPECTION OF THE FUEL TANK
The fuel system is under a constant
pressure (even with the engine off). Before testing or servicing any
fuel system hose, fitting or line, the fuel system pressure must be
released. Failure to follow these instructions can result in possible
serious or fatal injury.
WARNING:
| 1. | Remove the Fuel Tank in accordance with the Service Information. (Refer to 14 - Fuel System/Fuel Delivery/TANK, Fuel - Removal) . |
| 2. | Remove the Fuel Pump Module. (Refer to 14 - Fuel System/Fuel Delivery/MODULE, Fuel Pump - Removal) . |
| 3. | Visually inspect the inside of the Fuel Tank for any obstructions or deformities. |
| 4. | Inspect the Fuel Pump Module Float arm for damage. |
Were any problems found?
Yes
- Repair or replace as necessary.
- Perform the POWERTRAIN VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
No
- Go To 5
5. POWERTRAIN CONTROL MODULE (PCM)
| 1. | Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Totally Integrated Power Module (TIPM) and the Powertrain Control Module (PCM). |
| 2. | Look for any chafed, pierced, pinched or partially broken wires. |
| 3. | Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the Sensor and Powertrain Control Module connectors. |
| 4. | Perform any Technical Service Bulletins that may apply. |
Were there any problems found?
Yes
- Repair as necessary.
- Perform the POWERTRAIN VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
No
- Replace and program the Powertrain Control Module in accordance with the Service Information. (Refer to 08 - Electrical/8E - Electronic Control Modules/MODULE, Powertrain Control - Removal) .
- Perform the POWERTRAIN VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).