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Injector Metering Rail Number 1 Pressure Sensor Circuit – Voltage Above Normal or Shorted to High Source
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Overview
| CODE | REASON | EFFECT |
| Fault Code: 451 PID: P157 SPN: 157 FMI: 3 LAMP: Amber SRT: |
Injector Metering Rail Number 1 Pressure Sensor Circuit – Voltage Above Normal or Shorted to High Source. High signal voltage detected at rail fuel pressure sensor circuit. |
Automotive: Power and or speed derate. Marine: None. |
 Rail Fuel Pressure Sensor Circuit
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Circuit Description
The fuel pressure sensor is used by the electronic control module (ECM) to monitor the fuel pressure in the fuel rail. The sensor gets +5-VDC from the ECM and is grounded by a return pin. A third pin is the signal pin. The power and return pins are shared with other devices on the engine.
Component Location
The fuel pressure sensor is installed in the fuel rail. Refer to Section E for a detailed component location view.
Shop Talk
This fault code will become active if there is an open circuit on any of the three pins (+5 volt supply, signal, or return) that connect the sensor or ECM to the wiring harness. This fault will also be active if the signal wire is shorted to a source of voltage. This fault code will become inactive any time the keyswitch is ON and the signal returns to a valid in-range voltage.
Causes for this fault code include:
- Voltage (+5-VDC or higher shorted to the signal wire)
- Open circuit on the signal wire
- Open circuit on the +5-VDC supply wire
- Open circuit on the return wire
- Damaged sensor
- Malfunctioning ECM.
Refer to Troubleshooting Fault Code t05-451
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