BOOM AS 1221796 - Caterpillar

Illustration 1 g01134670
Schematic of the Boom Cylinder Retract SolenoidThis diagnostic code is associated with the Boom Cylinder Retract Solenoid. The FMI 03 means that the ECM has determined that the voltage of the solenoid circuit is above normal. The possible causes of the diagnostic code are listed:
The solenoid has failed.
The energize circuit of the solenoid is shorted to the +battery circuit.
The ECM has failed. This is unlikely.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 has been corrected. Ensure that the diagnostic code of CID 1138 FMI 03 is active before performing this procedure.Note: Use the 146-4080 Digital Multimeter for the measurements in this procedure.System Response:The diagnostic code of CID 1138 FMI 03 will be logged in the internal memory of the Machine ECM.Test Step 1. CHECK THE ENERGIZE CIRCUIT OF THE SOLENOID FOR A SHORT TO THE +BATTERY CIRCUIT.
Turn the key start switch and the disconnect switch to the OFF position.
Disconnect the machine harness connectors from the solenoid and the ECM.
At the machine harness connector for the ECM, measure the resistance from contact J2-61 (wire K949-OR) to all 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 machine harness is correct. Proceed to Test Step 2.
NOT OK - Each resistance measurement is not greater than 5000 ohms. There is a short in the machine harness. The short is between J2-61 (K949-OR) and the circuit that has a low resistance measurement. Repair: Repair the machine harness or replace the machine harness. Stop.Test Step 2. CHECK THE BACKUP BOOM SWITCH.
Remove wire K949-OR from contact 6 of the Backup Boom Switch.
Turn the key switch and the disconnect switch to the ON position.
At the machine harness connector for the ECM, measure the voltage between the contact J2-61 (wire K949-OR) and frame ground.Expected Result:The voltage measures approximately 0.0 0.5 DCV.Results:
OK - The voltage measures approximately 0.0 0.5 DCV. The voltage is correct. The Backup Boom Switch has failed.Repair: Replace the Backup Boom Switch. Stop.
NOT OK - The voltage measurement is greater than 0.0 0.5 DCV. The voltage is not correct. The machine harness or the Backup EPR Valve Switch has failed. Proceed to Test Step 3.Test Step 3. CHECK THE BACKUP EPR VALVE SWITCH.
Remove wire K909-BU from contact 1 of the Backup EPR Valve Switch.
At the machine harness connector for the ECM, measure the voltage between the contact J2-61 (wire K949-OR) and frame ground.Expected Result:The voltage measures approximately 0.0 0.5 DCV.Results:
OK - The voltage measures approximately 0.0 0.5 DCV. The voltage is correct. The Backup EPR Valve Switch has failed.Repair: Replace the Backup EPR Valve Switch. Proceed to Test Step 4.
NOT OK - The voltage measurement is greater than 0.0 0.5 DCV. The voltage is not correct. The machine harness has failed.Repair: Repair the machine harness or replace the machine harness. Proceed to Test