• | Perform the Diagnostic System Check - Vehicle prior to using the 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 | P0463 | P0461 |
Fuel Level Sensor Low Reference | -- | 1 | P0463 | P0463 | P0461 |
1. Fuel Gage Inaccurate or Inoperative |
The engine control module (ECM)/powertrain control module (PCM) monitors the signal circuit of the fuel level sender in order to determine fuel level. The sender consists of a variable resistor that changes resistance based on the fuel level in the tank. The ECM/PCM monitors the voltage across the sender resistance in order to determine the fuel level. The ECM/PCM uses the signal circuit of the fuel level sender in order to calculate the total remaining fuel, in percent. The ECM/PCM sends the fuel level percent via the serial data circuit to the instrument cluster in order to control the fuel gage.
Instrument Cluster Description and Operation
• | Circuit Testing |
• | Wiring Repairs |
Control Module References for scan tool information
⇒ | If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM/PCM. |
⇒ | If not within the specified range, test the signal circuit for an open/high resistance. If the circuits test normal, replace the ECM/PCM. |
⇒ | 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 6.6L engine |
• | Fuel Sender Assembly Replacement for the 7.8L engine |
• | Fuel Sender Assembly Replacement for the 8.1L engine |
• | Control Module References for the ECM/PCM or IPC replacement, setup, and programming |
• | Perform the Diagnostic System Check - Vehicle prior to using the 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, P2068 | P0463, P2068 | P0461, P2066 |
Fuel Level Sensor Low Reference | -- | 1 | P0463, P2068 | P0463, P2068 | P0461, P2066 |
1. Fuel Gage Inaccurate or Inoperative |
The engine control module (ECM)/powertrain control module (PCM) monitors the signal circuits of the primary fuel level sender and the secondary fuel level sender in order to determine fuel level. Each sender consists of a variable resistor that changes resistance based on fuel level in both tanks. The ECM/PCM monitors the voltage across both sender resistances in order to determine the fuel level. The ECM/PCM uses the signal circuits of the primary fuel level sender and the secondary fuel level sender in order to calculate the total remaining fuel, in percent. The ECM/PCM sends the fuel level percent via serial data circuit to the instrument cluster in order to control the gage.
Instrument Cluster Description and Operation
• | Circuit Testing |
• | Wiring Repairs |
Control Module References for scan tool information
⇒ | If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM/PCM. |
⇒ | If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM/PCM. |
⇒ | If not within the specified range, test the signal circuit for an open/high resistance. If the circuits test normal, replace the ECM/PCM. |
⇒ | 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 6.6L engine |
• | Fuel Sender Assembly Replacement for the 7.8L engine |
• | Fuel Sender Assembly Replacement for the 8.1L engine |
• | Control Module References for the ECM/PCM or IPC replacement, setup, and programming |