• | 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. |
Circuit | Short to Ground | High Resistance | Open | Short to Voltage | Signal Performance |
---|---|---|---|---|---|
Fuel Level Sensor Signal | P0462 | 1 | P0463, P0464 | P0463 | P0461 |
Fuel Level Sensor Low Reference | -- | 1 | P0463, P0464 | P0463 | P0461 |
1. Fuel Gage Inaccurate or Inoperative |
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 the serial data circuit to the body control module (BCM). The BCM then sends the fuel information to the instrument panel cluster (IPC) via the serial data circuit in order to display the fuel gage.
Instrument Cluster Description and Operation
Control Module References for scan tool information
Ignition ON, verify DTC P0461, P0462, or P0463 is not set
⇒ | If any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle. |
⇒ | If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM. |
⇒ | If not within the specified range, test the signal circuit for an open/high resistance. If the circuits test normal, replace the ECM. |
⇒ | If the gage is incorrect, replace the IPC. |
⇒ | If not within the specified range, replace the fuel level sensor. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Fuel Level Sensor Replacement for the 6.0L (LFA) engine |
• | Fuel Level Sensor Replacement for the 4.8L, 5.3L, 6.0L, 6.2L, or 7.0L engine |
• | Control Module References for the ECM or IPC replacement, setup, and programming |
• | 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. |
Circuit | Short to Ground | High Resistance | Open | Short to Voltage | Signal Performance |
---|---|---|---|---|---|
Fuel Level Sensor Signal | P0462, P2067 | 1 | P0463, P0464, P2068 | P0463, P2068 | P0461, P2066 |
Fuel Level Sensor Low Reference | -- | 1 | P0463, P0464, P2068 | P0463, P2068 | P0461, P2066 |
1. Fuel Gage Inaccurate or Inoperative |
The fuel level sensor changes resistance in response to the fuel level. The engine control module (ECM) monitors the signal circuits of the primary and secondary fuel level sensors in order to determine the fuel level. When the fuel tanks are full, the sensor resistances are low and the ECM senses a low signal voltage. When the fuel tanks are empty, the sensor resistances are high and the ECM senses a high signal voltage. The ECM uses the signal circuits of the primary and secondary fuel level sensors in order to calculate the percentage of remaining fuel in the tanks. The ECM sends the fuel level percentage via the serial data circuit to the body control module (BCM). The BCM then sends the fuel level information to the instrument panel cluster (IPC) via the serial data circuit in order to display the fuel level.
Instrument Cluster Description and Operation
Control Module References for scan tool information
Ignition ON, verify DTC P0461, P0462, P0463, P0464, P2066, P2067, or P2068 is not set
⇒ | If any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle. |
⇒ | If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM. |
⇒ | If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM. |
⇒ | If not within the specified range, test both signal circuits for an open/high resistance. If the circuits test normal, replace the ECM. |
⇒ | If the gage is incorrect, replace the IPC. |
⇒ | If not within the specified range, replace the primary fuel level sensor. |
⇒ | If not within the specified range, replace the secondary fuel level sensor. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Fuel Level Sensor Replacement for the 6.0L (LFA) engine |
• | Fuel Level Sensor Replacement for the 4.8L, 5.3L, 6.0L, 6.2L, or 7.0L engine |
• | Control Module References for the ECM or IPC replacement, setup, and programming |