• | 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 sender changes resistance based on fuel level. The powertrain control module (PCM) monitors the signal circuit of the fuel level sender in order to determine fuel level. When the fuel tank is full, the sender resistance is low and the PCM senses a low signal voltage. When the fuel tank is empty, the sender resistance is high and the PCM senses a high signal voltage. The PCM uses the signal circuit of the fuel level sender in order to calculate the total remaining fuel percentage in the tank. The PCM sends the fuel level percent via the class 2 serial data circuit to the instrument cluster in order to control the fuel gage. The fuel level information is also used for misfire and evaporative emission (EVAP) diagnostics.
• | The ignition is OFF. |
• | DTC P0442 is running. |
• | The fuel level change is greater than 10 percent. |
• | The above condition is present for greater than 30 seconds. |
• | DTC P0442 is aborted. |
• | The ECM/PCM records the operating conditions at the time the diagnostic fails. The ECM/PCM displays the failure information in the Failure Records on the scan tool. |
• | 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. |
• | Engine Controls Schematics for the 2.9L engine |
• | Engine Controls Schematics for the 3.7L engine |
• | Powertrain Control Module Connector End Views for the 2.9L engine |
• | Powertrain Control Module Connector End Views for the 3.7L engine |
⇒ | If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuits tests normal, replace the PCM. |
⇒ | If not within the specified range, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the PCM. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Fuel Level Sensor Replacement for the 2.9L engine |
• | Fuel Level Sensor Replacement for the 3.7L engine |
• | Control Module References for the PCM replacement, setup, and programming |