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PACCAR PX-8 CM2150 (2007-09) Fault Code: 553 (ISC/ISL) PID: 157 SPN: 157 FMI: 0 Injector Metering Rail Number 1 Pressure – Data Valid but Above Normal Operating Range – Moderately Severe Level.
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.
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.
Possible repairs:
1)Replace the rail fuel pressure sensor.
2)Repair the source of the high fuel drain line restriction.
3)lace the fuel pump actuator.
PACCAR PX-8 CM2150 (2007-09) Fault Code: 553 (ISB/QSB3.3) PID: 157 SPN: 157 FMI: 0 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.
PACCAR PX-8 CM2150 (2007-09) Fault Code: 529 PID: SID 051 SPN: 703 FMI: 3 Auxiliary Input/Output 3 Circuit – Voltage Above Normal or Shorted to High Source. High signal voltage has been detected at the auxiliary input/output 3 circuit.
PACCAR PX-8 CM2150 (2007-09) Fault Code: 528 PID: 93 SPN: 93 FMI: 2 Auxiliary Alternate Torque Validation Switch – Data Erratic, Intermittent, or Incorrect. An error has been detected in the alternate torque switch circuit.
PACCAR PX-8 CM2150 (2007-09) Fault Code: 499 PID: 98 SPN: 98 FMI: 4 Engine Oil Level Sensor Circuit – Voltage Below Normal or Shorted to Low Source. The engine oil level sensor has detected an internal failure.
PACCAR PX-8 CM2150 (2007-09) Fault Code: 488 PID: 105 SPN: 105 FMI: 16 Intake Manifold 1 Temperature – Data Valid but Above Normal Operational Range – Moderately Severe Level. Intake manifold air temperature signal indicates intake manifold air temperature is above engine protection warning limit.
PACCAR PX-8 CM2150 (2007-09) Fault Code: 471 PID: 98 SPN: 98 FMI: 1 Engine Oil Level – Data Valid But Below Normal Operational Range – Least Severe Level. Low oil level has been detected by the oil level sensor.