SHAFT 5D7337 - Caterpillar

During normal operation, each pressure sensor outputs a signal voltage that accurately represents the pressure that is sensed by the sensor. However, certain circuit conditions can cause a signal voltage to become inaccurate.During each key on event of at least two seconds, the Electronic Control Module (ECM) evaluates the signal voltage from each pressure sensor. The ECM compares each signal voltage to a reference voltage. The reference voltage that is used depends on the sensor.If a signal voltage is close to the reference voltage, the ECM will internally adjust the signal voltage. The internal adjustment causes the pressure value for the sensor to be correct. This process is called automatic sensor calibration.If a signal voltage is not close to the reference voltage, the ECM will not internally adjust the signal voltage. The ECM will set a fault code that indicates there is a problem with the signal voltage.Table 1 indicates the maximum error that is permitted for each sensor, and the reference for that sensor. Refer to the troubleshooting procedure to determine the root cause of the incorrect signal voltage.
Table 1
Diagnostic Trouble Codes    
J1939 Code     CDL Code     Code Description
(code descriptions may vary)     Comments    
101-13     101-13     Crankcase Air Pressure Sensor : Out of Calibration     During key on, the signal voltage from the crankcase air pressure sensor indicated a crankcase air pressure greater than +/- 1.5 kPa (0.2 psi).
There is not a reference sensor for this sensor    
411-13     3387-13     EGR Differential Pressure Sensor : Out of Calibration     During key on, the signal voltage from the EGR differential pressure sensor indicated a differential pressure greater than +/-
11 kPa (2 psi).
There is not a reference sensor for this sensor    
2458-13     3251-13     DPF #1 Differential Pressure Sensor : Out of Calibration     During key on, the signal voltage from the diesel particulate filter #1 differential pressure sensor indicated a dpf differential pressure greater than +/-
2 kPa (0.3 psi).
The 2458-13 will not activate for several hours if the ambient temperature is below
7° C (45° F) or if an active regeneration has not been performed.
There is not a reference sensor for this sensor    
3358-13     3385-13     EGR Intake Pressure Sensor : Out of Calibration     During key on, the signal voltage from the EGR intake pressure sensor indicated an EGR intake pressure greater than +/-
18 kPa (3 psi) from the