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PACCAR PX-8 CM2150 (2007-09) Fault Code: 123 PID: 102 SPN: 102 FMI: 4 Intake Manifold 1 Pressure Sensor Circuit – Voltage Below Normal or Shorted to Low Source. Low signal voltage or open circuit detected at the intake manifold pressure 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 intake manifold pressure sensor shares supply and return wires in the engine harness with other sensors. Opens and shorts in the engine harness can cause multiple fault codes to be active. Before troubleshooting Fault Code 123, check for multiple faults.
Possible causes :
1)Signal circuit open or shorted to ground in the engine harness or sensor.
2)Supply line open or shorted to ground.
Possible repairs:
1)Replace the intake manifold pressure sensor.
2)The removal and installation of the connector may correct the problem.
3)Replace the ECM.
4)Repair or replace the engine harness.
PACCAR PX-8 CM2150 (2007-09) Fault Code: 122 PID: 102 SPN: 102 FMI: 3 Intake Manifold 1 Pressure Sensor Circuit – Voltage Above Normal or Shorted to High Source. High signal voltage detected at the intake manifold pressure circuit.
PACCAR PX-8 CM2150 (2007-09) Fault Code: 115 PID: 190 SPN: 612 FMI: 2 Engine Magnetic Speed/Position Lost Both of Two Signals – Data Erratic, Intermittent, or Incorrect. The engine control module (ECM) has detected that the primary and backup speed sensor signals are connected backwards.
PACCAR PX-8 CM2150 (2007-09) Fault Code: 111 PID: SID 254 SPN: 629 FMI: 12 Electronic Control Module Critical Internal Failure – Bad Intelligent Device or Component. Error internal to the electronic control module (ECM) related to memory hardware failures or internal ECM voltage supply circuits.
Cummins ISM CM870 (2003-06) Fault Code: 111 PID: S254 SPN: 629 FMI: 12/12 Engine Control Module Critical Internal Failure – Bad Intelligent Device or Component. Error internal to the engine control module (ECM) related to memory hardware malfunctions or internal ECM voltage supply circuits.
Cummins ISM CM870 (2003-06) Fault Code: 9121 PID: S146 SPN: 2791 FMI: 0/15 EGR Valve Actuator Over Temperature (Calculated) – Data Above Normal Range – least severe level.
Cummins ISM CM870 (2003-06) Fault Code: 2973 PID: P102 SPN: 102 FMI: 2/2 Intake Manifold Pressure – data incorrect. The ECM has detected an intake manifold pressure signal that is too high or low for current engine operating conditions.