CYLINDER GP-BOOM 3976974 - Caterpillar

Illustration 1 g03839336
Schematic of the Push Button Switch (Blade Cross Slope Switch)This diagnostic code is associated with the Push Button Switch (Blade Cross Slope Switch) located on the RH joystick. The switch is connected to two inputs of the ECM. One contact is open and the other contact is grounded during proper operation. This FMI 03 diagnostic code means that the ECM has determined that the normally open contact and the normally closed contact are open.Note: The following test procedure may create other diagnostic codes. Ignore these diagnostic codes and clear the diagnostic codes when the original diagnostic code has been corrected. Ensure that the diagnostic code of CID 4784 FMI 03 is active before performing this procedure.Test Step 1. CHECK THE GROUND CIRCUIT OF THE SWITCH IN THE HARNESS.
Turn the key start switch and the disconnect switch to the OFF position.
Disconnect the machine harness connectors from the ECM.
Measure the resistance between contact J2-22 (wire H745-BR) of the machine harness for the ECM and contact 7 (wire H745-BR) at the joystick connector.Expected Result:The resistance is less than 5 ohms. Results:
OK - The resistance is less than 5 ohms. The circuit is correct. Proceed to Test Step 2.
NOT OK - The resistance is greater than 5000 ohms. The circuit is open. The machine harness has failed.Repair: Repair the machine harness or replace the machine harness.STOPTest Step 2. CHECK THE SWITCH CIRCUITS FOR A SHORT TO THE +BATTERY CIRCUIT.
The machine harness connectors remain disconnected from the ECM.
The disconnect switch and the key start switch remain in the OFF position.
Disconnect connector for the joystick from the connector of the machine harness.
At the machine harness connector for the ECM, measure the resistance from contact J2-36 (wire J944-BU) and contact J2-44 (wire J943-GN) of the machine harness to all the contacts that are used in the machine harness connectors for the ECM.Expected Result:Each resistance measurement is greater than 5000 ohms.Results:
OK - Each resistance measurement is greater than 5000 ohms. The harness is correct. Proceed to Test Step 3.
NO - One or more of the measurements were less than 5 ohms. There is a short in the machine harness. Repair: The short is between wire J943-GN and the circuit with the lowest resistance measurement or the short is between wire J944-BU and the circuit with the lowest resistance measurement. Repair the machine harness or replace the machine harness.STOPTest Step 3. CHECK THE SWITCH CIRCUITS IN THE HARNESS.
The machine harness remains disconnected from the ECM and the joystick.
At the harness connector for the joystick, connect a jumper wire between contact 8 (wire J943-GN) and contact 9 (wire J944-BU).
At the harness connector for the ECM, measure the resistance from contact J2-36 (wire J944-BU) to contact J2-44 (wire J943-GN).Expected Result:The resistance is less than 5 ohms. Results:
OK - The resistance is less than 5 ohms. Proceed to Test Step 4.
NOT OK - The resistance is greater than 5000 ohms. The circuit is open.Repair: The machine harness has failed. Repair the machine harness or replace the machine harness.STOPTest Step