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Rail Fuel Pressure Sensor Circuit
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Overview
| CODE | REASON | EFFECT |
| Fault Code: 547 PID: P094 SPN: 94 FMI: 4/4 LAMP: Amber SRT: |
Rail Fuel Pressure Sensor Circuit – shorted low. Low signal voltage detected at rail fuel pressure circuit. |
Engine may not start, 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 547, check for multiple faults.
Possible causes of this fault code include:
- Open signal circuit in the engine harness, connectors, or sensor.
- Signal circuit shorted to ground in the engine harness, connector, or sensor.
- Failed sensor.
Refer to Troubleshooting Fault Code t05-547
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