MOTOR GP-PS-F-25 0R8640 - 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
J1939 Code and Description CDL Code and Description Comments
101-13
Engine Crankcase Pressure : Out of Calibration 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
109-13
Engine Coolant Pressure : Out of Calibration 2802-13
Power Inverter #2 ECM Power Supply Output #2 : Out of Calibration During key on, the signal from the coolant pressure sensor does not fall within a tunable threshold of the atmospheric pressure sensor.
Reference sensor : Atmospheric Pressure Sensor
411-13
Engine Exhaust Gas Recirculation Differential Pressure : Out of Calibration 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
3358-13
Engine Exhaust Gas Recirculation Inlet Pressure : Out of Calibration 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 atmospheric pressure sensor.
Reference sensor : Atmospheric Pressure Sensor
3563-13
Engine Intake Manifold #1 Absolute Pressure : Out of Calibration 1785-13
Intake Manifold Pressure Sensor : Out of Calibration During key on, the signal voltage from the Intake Manifold pressure sensor indicated an Intake Manifold pressure greater than +/- 18 kPa (3 psi) from the Atmospheric Pressure sensor.
Reference sensor : Atmospheric Pressure Sensor
5708-13
Engine Coolant Pressure #2 : Out of Calibration N/A During key on, the signal from the coolant pressure sensor does not fall within a tunable threshold of the atmospheric pressure sensor.
Reference sensor : Atmospheric Pressure Sensor
Table 2
Troubleshooting Test Steps Values Results
1. Check for Codes
Note: The engine coolant temperature must be greater than 0° C (32° F) before beginning this procedure.
A. Connect Cat® Electronic Technician (ET) to the service tool