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Injector Metering Rail Number 1 Pressure – Data Valid but Above Normal Operating Range – Moderately Severe Level
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Overview
| CODE | REASON | EFFECT |
| Fault Code: 553 PID: P157 SPN: 157 FMI: 0/16 LAMP: Amber SRT: |
Injector Metering Rail Number 1 Pressure – Data Valid but Above Normal Operating Range – Moderately Severe Level. The ECM has detected that fuel pressure is higher than the commanded pressure. |
None or possible engine noise associated with higher injection pressures (especially at idle or light load). Engine power is reduced. |
 ISC and ISL with CM2150 – Fuel Rail Pressure Sensor
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Circuit Description
The electronic control module (ECM) monitors engine operating conditions, including the reading of rail fuel pressure, and changes the flow command to either increase (open the fuel pump actuator) or decrease (close the fuel pump actuator) the fuel supply to the high-pressure pump.
Component Location
The fuel pump actuator is installed in the adapter on the back of the high-pressure fuel pump.
Refer to Procedure 100-002 in Section E for a detailed component location view.
Conditions for Running the Diagnostics
This diagnostic runs continuously when the engine is running.
Conditions for Setting the Fault Codes
The ECM has detected that the fuel rail pressure reading has exceeded the recommended operating limits.
Action Taken When the Fault Code is Active
The ECM illuminates the amber CHECK ENGINE light immediately when the diagnostic runs and fails.
A default value for the fuel rail pressure reading is used.
The fuel rail pressure will be regulated to the fuel rail pressure relief valve.
Conditions for Clearing the Fault Code
The ECM will turn off the amber CHECK ENGINE light immediately after the fuel rail pressure drops to zero and the fuel rail pressure relief valve resets. This will normally occur at key-off.
Shop Talk
Verify the electronic control module (ECM) calibration is correct. Check the calibration revision history found on QuickServe™ Online for applicable fixes to the calibration stored in the ECM. If necessary, recalibrate the ECM. Refer to Procedure 019-032 in Section 19 in the corresponding Troubleshooting and Repair Manual for the engine being serviced.
A fuel pump actuator with excessive leakage or a damaged inboard o-ring will result in high fuel rail pressures at idle or light load.
If the fuel pump actuator exhibits excessive leakage, it is possible that the fuel rail pressure will reach the opening pressure of the fuel rail pressure relief valve and Fault Code 1911 can possibly also become active.
- The fuel rail pressure sensor should also be checked. When checking the fuel rail pressure sensor accuracy, make sure the high-pressure fuel rail is not pressurized. The fuel pump, high-pressure fuel lines, and fuel rail contain very high-pressure fuel. Do not loosen any fittings while the engine is running. Once the engine is keyed off, there could be a significant amount of time waiting on the rail to depressurize to zero. It is necessary to manually relieve the pressure from the high-pressure fuel rail by loosening the pump to rail line at the rail.
Refer to Troubleshooting Fault Code t05-553
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