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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.
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.
The switch can be monitored for proper operation with INSITE™ electronic service tool. If the switch is changing state correctly on the service tool, then the problem does not lie in the switch circuit.
The 3-position switch has three states:
1)Position 1 – open
2)Position 2 – closed
3)Position 3 – 1500 ohm resistance.
The 2-position switch has two states:
1)Position 1 – open
2)Position 2 – closed.
Possible repairs:
1)Replace the alternate torque switch.
2)Repair or replace the OEM harness.
3)The removal and reinstallation of the connector may correct the problem.
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.
PACCAR PX-8 CM2150 (2007-09) Fault Code: 452 PID: 157 SPN: 157 FMI: 4 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.
PACCAR PX-8 CM2150 (2007-09) Fault Code: 451 PID: 157 SPN: 157 FMI: 3 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.
PACCAR PX-8 CM2150 (2007-09) Fault Code: 449 (ISC/ISL) PID: 94 SPN: 157 FMI: 0 Injector Metering Rail Number 1 Pressure – Data Valid But Above Normal Operating Range – Most Severe Level. The ECM has detected that fuel pressure in the fuel rail is higher than the fuel pressure relief valve.