CONTROL GP-JOYSTICK 3285935 - Caterpillar

Illustration 1 g01954061
Schematic for the Variable Implement Pump Pressure sensorNote: The sensor is not directly connected to the frame ground. The sensor return connects to the ECM, and the ECM connects the sensor return to frame ground internally.This diagnostic code is associated with the Variable Implement Pump Pressure sensor. An FMI 04 indicates the machine ECM has determined the sensor output signal voltage is below normal. Possible causes for this diagnostic code are:
The sensor has failed.
The sensor output signal is shorted to ground.
The machine ECM may have failed, but is unlikely.Note: Poor connections are often the cause of a problem in electrical circuits. Before performing this procedure, inspect all the machine harnesses and connectors involved in the circuit. Make sure to verify that all of the connections in the circuit are clean, secure, and in good condition. Correct any problems found with any of the connections. Verify the diagnostic code CID 0864 FMI 04 is still active, before continuing with this procedure.Note: The following test procedure may create other diagnostic codes. Ignore these created diagnostic codes now, but clear those codes when the original diagnostic code has been corrected. Test Step 1. CHECK THE SENSOR.
Turn the disconnect switch and the key start switch to the OFF position.
Disconnect the harness connector from the Variable Implement Pump Pressure sensor.
Turn the disconnect switch and the key start switch to the ON position.
Observe the status