BASE-VALVE COVER 3323706 - Caterpillar

Illustration 1 g01134038
Schematic of the Boom Drift Reduction SolenoidThis diagnostic code is associated with the Boom Drift Reduction 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 1119 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 1119 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 J2-54 (wire P946-BR) 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 J2-54 (P946-BR) 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 RETURN CIRCUIT OF THE SOLENOID FOR A SHORT TO +BATTERY.
The key start switch remains in the OFF position.
The solenoid remains disconnected from the machine harness.
The machine harness connectors J1 and J2 remain disconnected from the machine ECM.
At the machine harness for the solenoid, measure the voltage between the contact 2 (wire H807-YL) and frame ground.Expected Result:The voltage is approximately 0.0 0.5 DCV.Results:
OK - The voltage is approximately 0.0 0.5 DCV. The voltage is correct. Proceed to Test Step 4.
NOT OK - The voltage is greater than 0.0 0.5 DCV. Proceed to Test Step 3.Test Step 3. CHECK THE BACKUP EPR VALVE SWITCH.
Turn the key start switch to the ON position.
Ensure that the backup EPR valve switch is in the AUTO position.
The solenoid remains disconnected from the machine harness.
The machine harness connectors J1 and J2 remain disconnected from the machine ECM.
Disconnect wire H807-YL from contact 11 of the Backup EPR Valve Switch.
At the backup EPR valve switch, measure the voltage between the contact 11 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. Proceed to Test Step 4.
NOT OK - The voltage measurement is greater than 0.0 0.5 DCV. The voltage is not correct. The Backup EPR Valve Switch