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Rail Fuel Pressure Sensor Circuit
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Overview
| CODE | REASON | EFFECT |
| Fault Code: 546 PID: P094 SPN: 94 FMI: 3/3 LAMP: Amber SRT: |
Rail Fuel Pressure Sensor Circuit – shorted high. High signal voltage detected at the rail fuel pressure circuit. |
Engine may crank longer than usual before starting, may have low power, white smoke, or run rough. |
 Rail Fuel Pressure Sensor Circuit
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Circuit Description
The rail fuel pressure sensor is used by the electronic control module (ECM) to monitor fuel pressure.
Component Location
The rail fuel pressure sensor is located on the bottom front corner of the integrated fuel system module (IFSM). Refer to Section E for a detailed component location view.
Shop Talk
The rail fuel pressure sensor shares supply and return wires in the engine harness with other sensors. Opens and shorts in the engine harness can cause multiple fault codes to be active. Before troubleshooting fault code 546, check for multiple faults.
Possible causes of this fault code include:
- Open return circuit in the engine harness, connectors, or sensor.
- Signal circuit shorted to sensor supply or battery voltage.
- Sensor supply circuit shorted to battery voltage.
Refer to Troubleshooting Fault Code t05-546
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