Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptor
DTC P0461: Fuel Level Sensor Circuit PerformanceDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Fuel Level Sensor Reference Voltage Circuit | P0462 | -- | P0461 | |
Fuel Level Sensor Signal Circuit | P0462 | P0463 P0464 | P0463 | P0461 |
Fuel Level Sensor Low Reference Circuit | -- | P0463 P0464 | P0463 | P0461 |
Circuit/System Description
The fuel level sensor changes resistance in response to the fuel level. The engine control module (ECM) monitors the signal circuit of the fuel level sensor in order to determine the fuel level. When the fuel tank is full, the sensor resistance is low and the ECM senses a low signal voltage. When the fuel tank is empty, the sensor resistance is high and the ECM senses a high signal voltage. The ECM uses the signal circuit of the fuel level sensor in order to calculate the percentage of remaining fuel in the tank. The ECM sends the fuel level percentage via serial data circuit to the instrument cluster in order to control the fuel gage.
Conditions for Running the DTC
The engine is running.
Conditions for Setting the DTC
The ECM does not detect a change in fuel level of at least 1.6 percent over a distance of 193 km (120 miles).
Action Taken When the DTC Sets
| • | The fuel gage defaults to empty. |
| • | The low fuel indicator illuminates. |
| • | The ECM records the operating conditions at the time that the diagnostic test fails. The ECM displays the failure information in the Failure Records on the scan tool. |
Conditions for Clearing the DTC
| • | The DTC becomes history when the conditions for setting the DTC are no longer present. |
| • | The history DTC clears after 40 malfunction-free warm-up cycles. |
| • | The ECM receives a clear code command from the scan tool. |
Reference Information
Schematic Reference
| • | Engine Controls Schematics for the 5.3L engine |
| • | Engine Controls Schematics for the 3.5L engine |
| • | Engine Controls Schematics for the 3.9L engine |
Connector End View Reference
| • | Engine Control Module Connector End Views for the 5.3L engine |
| • | Engine Controls Connector End Views for the 3.5L engine |
| • | Engine Control Module Connector End Views for the 3.9L engine |
Electrical Information Reference
Scan Tool Reference
Circuit/System Testing
- Ignition OFF, remove the fuel level sender and verify there are no objects interfering with the fuel level sender.
- If all circuits test normal, perform the fuel level sensor component test before replacing the fuel level sensor.
| ⇒ | Repair any fuel level sender interference. |
Component Testing
- Ignition OFF, disconnect the harness connector at the fuel level sensor.
- While sweeping the fuel level sensor through its full range of motion, test for a minimum value less than 41 ohms and a maximum value greater than 119 ohms of resistance between signal terminal B and the low reference terminal C.
| ⇒ | If not within the specified range, replace the fuel level sensor. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Fuel Level Sensor Replacement for the 5.3L engine |
| • | Fuel Sender Assembly Replacement for the 3.5L engine |
| • | Fuel Level Sensor Replacement for the 3.9L engine |
| • | Control Module References for the ECM replacement, setup, and programming |
