SHAFT-PUMP 8F4999 - Caterpillar

Illustration 1 g02474177
Offset Boom Left Solenoid connectionsThis diagnostic code is associated with the attachment Offset Boom Left Solenoid. The FMI 03 diagnostic code means that the Implement ECM 2 has determined that the voltage of the solenoid circuit is above normal.Note: The Offset Boom Left Solenoid is electrically connected to the Implement ECM 2. The condition of the solenoid is monitored by the Machine ECM. The Machine ECM monitors all components attached to the Implement ECM 2 via the CAN B data link.The Offset Boom Left Solenoid is a proportional solenoid. The solenoid is controlled by the Implement ECM 2 through a PWM driver output. The Implement ECM 2 will control the current to the solenoid depending on the position of the thumbwheel on the right-hand joystick. This solenoid can be overridden in Cat ET.Conditions that can cause this diagnostic code are listed below:
The energize circuit of the solenoid is shorted to another voltage source.
The ECM has failed. This situation is unlikely.Before performing this procedure, inspect the harness connectors that are involved in the circuit. Poor connections can often be the cause of a problem in an electrical circuit. Verify that all connections in the circuit are clean, secure and in good condition. If a problem with a connection is found, correct the problem and verify that this diagnostic code is active before performing this procedure.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.Test Step 1. CHECK THE ENERGIZE CIRCUIT OF THE SOLENOID FOR A SHORT
Turn the key switch and the disconnect switch to the OFF position.
Disconnect the machine harness connector from the solenoid.
Disconnect the machine harness connectors from the Implement ECM 2.
At the machine harness connector for the Implement ECM 2, measure the resistance from the supply contact pin 26 (wire K760-PU) to all of the contacts that are used on the Implement ECM 2 connectors.Expected Result:Each resistance measurement is greater than 5000 ohms.Results:
OK - Each resistance measurement is greater than 5000 ohms. The energize circuit is not shorted to another circuit in the machine harness. 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 wire K760-PU and the circuit that has a low resistance measurement.Repair: Refer to the complete machine Electrical System Schematic. Examine all of the connectors in the circuits for points in the machine harness where the circuits could be shorted. For information on testing for short circuits and finding short circuits, refer to Testing and Adjusting, "Wiring Harness (Short Circuit) - Test". Repair the machine harness or replace the machine harness.STOPTest Step 2. CHECK THE OPERATION OF THE ECMThe disconnect switch and the key start switch remain in the OFF position. The machine harness connectors for the solenoid and the ECM remain disconnected.
At the machine harness connector for the Implement ECM 2, use a 151-6320 Removal