CYLINDER GP-BUCKET 3976980 - Caterpillar

Illustration 1 g03839619
Schematic of the RH Advanced Control Joystick Push Button Switch (Blade Cross Slope Switch)This diagnostic code is associated with the Push Button Switch (Blade Cross Slope Switch). The switch is connected to two inputs of the ECM. The inputs are "Normally Open" and "Normally Closed". One of the inputs is open and the other input is grounded during proper operation.The FMI 04 diagnostic code means that the ECM has determined that the "Normally Open" and "Normally Closed" circuits are grounded.Note: The following test procedure may create other diagnostic codes. Ignore these diagnostic codes and clear these diagnostic codes when the original diagnostic code has been corrected.Ensure that the diagnostic code of CID 4784 FMI 04 is active before performing this procedure.Test Step 1. CHECK THE SWITCH.
Turn the key start switch and the disconnect switch to the OFF position.
Disconnect the machine harness from the joystick.
Turn the key start switch and the disconnect switch to the ON position.Expected Result:The CID 4784 FMI 04 diagnostic code has been replaced by a CID 4784 FMI 03 diagnostic code.Results:
OK - The CID 4784 FMI 04 diagnostic code has been replaced by a CID 4784 FMI 03 diagnostic code. The machine harness and the ECM are correct. Proceed to Test Step 3.
NOT OK - The CID 4784 FMI 04 diagnostic code is still active. Proceed to Test Step 2.Test Step 2. CHECK THE HARNESS.
Turn the disconnect switch and the key start switch to the OFF position.
The machine harness remains disconnected from the joystick.
Disconnect the machine harness connectors from the ECM.
Measure the resistance between contacts J2-44 (wire J943-GN) and J2-36 (wire J944-BU) of the machine harness to all the contacts that are used in machine harness connectors for the ECM.Expected Result:Each resistance measurement is greater than 5000 ohms.Results:
YES - Each resistance measurement is greater than 5000 ohms. The ECM has failed.Repair: A failure of the ECM is unlikely. Exit this procedure and perform this procedure again. If the cause of the diagnostic code is not found, replace the ECM. See Testing and Adjusting, "Electronic Control Module (ECM) - Replace".STOP
NO - One or more of the resistance measurements are less than 5 ohms. The harness has failed. The short is between J2-44 (wire J943-GN) and the circuit with the lowest resistance or the short is between J2-36 (wire J944-BU) and the circuit with the lowest resistance. Repair: Repair the wiring harness or replace the wiring harness.STOPTest Step 3. CHECK THE OPERATION OF THE SWITCH.
The machine harness remains disconnected from the joystick.
Connect one lead from a multimeter to contact 7 (wire H745-BR) of the harness connector for the joystick.
Connect the other lead from a multimeter to contact 8 (wire J943-GN) of the harness connector for the joystick.
Measure the resistance between contact 7 (wire H745-BR) and contact 8 (wire J943-GN). Note the resistance.
Disconnect the lead from contact 8 (wire J943-GN) and connect the lead to contact 9 (wire J944-BU).
Measure the resistance between contact 7 (wire H745-BR) and contact 9 (wire J944-BU).Expected Result:The resistance from contact 7 (wire