DIFFERENTIAL GP 5076779 - Caterpillar

Illustration 1 g00614290
Schematic of the Boom Extend solenoidThis diagnostic code is associated with the boom extend solenoid. The FMI 03 means that the machine ECM determined that the voltage is above normal.The possible causes of this failure are listed here:
The solenoid energizer circuit is shorted to ground.
The solenoid has failed.
The machine ECM has failed. This is unlikely. When this failure occurs, a warning is displayed on the message center and the circuit is disabled. Note: The following test procedure may create other diagnostic codes. Ignore these created failures and clear the diagnostic codes when the original failure is corrected. Test Step 1. CHECK THE SOLENOID.
Turn the disconnect switch and the key start switch to the ON position. Do NOT start the engine.
Ensure that CID 1193 FMI 06 is active on the message center.
Disconnect the suspect solenoid from the machine harness.
Observe the message center. Expected Result:The diagnostic code is no longer active on the message center. Results:
YES - The diagnostic code is no longer active on the message center. The circuit is correct. Repair: The solenoid has failed. Replace the solenoid. Stop.
NO - The diagnostic code remains active. Proceed to test step 2.Test Step 2. CHECK THE SOLENOID ENERGIZER CIRCUIT FOR A SHORT TO GROUND.
Turn the key start switch and the disconnect switch to the OFF position.
Disconnect the machine harness from the solenoid.
Disconnect the machine harness connectors J1 and J2 of the machine ECM.
At the machine harness connector J2, measure the resistance from the contact J2-51 (wire K950-YL) to all possible sources of ground. Expected Result:The resistance measurements should be greater than 5000 ohms. Results:
OK - The resistance measurements were greater than 5000 ohms. The harness is correct. Proceed to test step 3.
NOT OK - The resistance is less than 5000 ohms. The harness is incorrect.Repair: The short is between the signal circuit (wire K950-YL) and the circuit with the lowest resistance measurement. Repair the machine harness or replace the machine harness. Stop.Test Step 3. CHECK IF THE DIAGNOSTIC CODE REMAINS.
Inspect the harness connectors and clean the contacts of the harness connectors.
Reconnect all harness connectors.
Turn the disconnect switch and the key start switch to the ON position.
Clear all the active events that are shown on the message center by pressing the OK key on the keypad.
Operate the machine.
Observe the message center. The diagnostic information may also be viewed with the ET. Expected Result:The diagnostic code is not active on the message center. Results:
YES - The diagnostic code is not active on the message center. The failure does not exist at this time. The initial failure was probably caused by a poor electrical connection or a short at one of the harness connections that was disconnected and reconnected. Resume normal machine operation. Stop.
NO - The diagnostic code is active on the message center.Repair: The failure has not been corrected. The ECM may have failed. It is unlikely that the ECM has failed. Exit this procedure and perform this procedure again. If the cause of the failure is not found, replace the