SUPPORT AS 1765021 - Caterpillar

Illustration 1 g01134670
Schematic of the Boom Cylinder Retract SolenoidThis diagnostic code is associated with the Boom Cylinder Retract Solenoid. The FMI 05 means that the machine ECM determined that the current is below normal.The possible causes of this diagnostic code are listed:
The solenoid energizer circuit is open.
The return circuit of the solenoid is open.
The backup EPR valve switch has failed.
The solenoid has failed.
The machine ECM has failed. This is unlikely. When this diagnostic code occurs, a warning is displayed on the Monitoring System. The machine ECM disables the circuit. Note: The following test procedure may create other diagnostic codes. Ignore these created diagnostic codes and clear these diagnostic codes when the original diagnostic code 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.
Disconnect the suspect solenoid from the machine harness.
At the machine harness connector for the solenoid, place a jumper between contact 1 (wire K949-OR) and contact 2 (wire K952-BR).
Observe the monitor.Expected Result:The diagnostic code alternates between the active status and the inactive status as the jumper is installed and the jumper is removed. The Monitoring System may take several seconds before the diagnostic information is updated. This is normal. The diagnostic information may also be viewed with the ET. Results:
YES - The diagnostic code alternates between the active status and the inactive status as the jumper is installed and the jumper is removed. The circuit is correct.Repair: Replace the solenoid. Stop.
NO - The diagnostic code remains. The harness or the machine ECM has failed. Proceed to test step 2.Test Step 2. CHECK THE BACKUP EPR VALVE SWITCH AND THE RETURN CIRCUIT.
Turn the key start switch and the disconnect switch to the OFF position.
Remove the jumper that was placed in the previous test.
Disconnect the machine harness connector J2 from the machine ECM and the machine harness from the boom retract solenoid.
Use the Electronic System Schematic to locate the backup EPR valve switch.
Place the backup EPR valve switch in the AUTO position.
At the machine harness connector, measure the resistance from contact J2-52 (wire K952-BR) to the solenoid's connector contact 2 (wire K952-BR). Expected Result:The resistance measures