PISTON 4941834 - Caterpillar

Illustration 1 g00806126
Schematic for the Pressure Sensor (Head End for the Lift Cylinder)
This diagnostic code is recorded when the implement ECM determines that the signal from the pressure sensor for the head end of the lift cylinder is outside the allowable range. Refer to Systems Operation, "Sensors" for information regarding the operation of the sensor and the location.The frequency should be approximately 200 20 Hz at a pressure of 0 kPa (0 psi). The frequency should be approximately 800 30 Hz at a pressure of 20700 kPa (3000 psi).The possible causes for this diagnostic code are listed:
The pressure sensor has failed.
The circuit for the +battery to the sensor has a intermittent connection.
The return circuit from the sensor has a intermittent connection.
The signal circuit from the sensor has a intermittent connection.
The ECM has failed. This is unlikely.System Response:The machine response is listed:
The autodig feature will not operate.Note: Use the 146-4080 Digital Multimeter for the measurements in this procedure. Note: The following test procedure may create other diagnostic codes. Ignore these created diagnostic codes and clear the diagnostic codes when the original diagnostic code has been corrected.Note: Ensure that the diagnostic code is active.Test Step 1. CHECK FOR POWER AT THE SENSOR.
Do not disconnect the harness connector from the sensor.
Turn the key start switch