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Injector Metering Rail Number 1 Pressure Sensor Circuit – Voltage Below Normal or Shorted to Low Source
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Overview
| CODE | REASON | EFFECT |
| Fault Code: 452 PID: P157 SPN: 157 FMI: 4 LAMP: Amber SRT: |
Injector Metering Rail Number 1 Pressure Sensor Circuit – Voltage Below Normal or Shorted to Low Source. Low signal voltage detected at the 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 inactive any time the keyswitch is ON and the signal pin of the ECM is too low. This can be caused by a short circuit to ground on the +5-VDC supply or signal wire. This fault will also become active if a device that is powered by the common +5-VDC power supply is shorted to ground. 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:
- Engine harness; the supply or signal wire is shorted to ground
- Other components; any component connected to the common power supply is shorted to ground
- Failed sensor
- Failed ECM.
Refer to Troubleshooting Fault Code t05-452
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