LINK AS-TRACK 7T7633 - Caterpillar

Illustration 1 g02789461
Schematic of the "Boom Cylinder Extend Limit" SolenoidThis diagnostic code is associated with the "Boom Cylinder Extend Limit" Solenoid. The FMI 05 diagnostic code means that the Machine ECM has determined that the current for the solenoid circuit is below normal.Some possible causes of this diagnostic code are listed below:
The energize circuit of the solenoid is open.
The return circuit of the solenoid is open.
The Backup Crane switch has failed.
The solenoid has failed.
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.Note: The resistance of the solenoid coil should be 8.7 .4 ohms at 25 °C (77.0 °F).Test Step 1. CHECK THE SOLENOID
Disconnect the solenoid from the machine harness.
At the machine harness connector for the solenoid, place a jumper wire from contact 1 (wire K950-YL) to contact 2 (wire K952-BR).
Turn the disconnect switch and the key start switch to the ON position. Do not start the engine.
Observe the status of the CID 2420 FMI 05 diagnostic code.Expected Result:The active diagnostic code changes from an FMI "05" to an FMI "06" diagnostic code when the jumper wire is installed.Results:
YES - The active diagnostic code changes from an FMI "05" to an FMI "06" diagnostic code when the jumper wire is installed. The solenoid has failed.Repair: The solenoid has failed. Repeat this Test Step "CHECK THE SOLENOID" to verify the solenoid failure. Replace the solenoid. Verify that the new solenoid corrects the problem.STOP
NO - The CID 2420 FMI 05 diagnostic code remains active. The jumper wire does not affect the status of the diagnostic code. The solenoid is not the cause the problem. Proceed to Test Step 2.Test Step 2. CHECK THE "BACKUP CRANE" 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 Extend" solenoid.
Use the Electronic System Schematic to locate the "Backup Crane" switch.
Place the "Backup Crane" switch in the ON position.
At the machine harness connector, measure the resistance from contact J2-35 (wire M739-YL) to the connector contact 2 of the solenoid (wire K952-BR). Expected Result:The resistance measures less than 5 ohms. Results:
OK - The resistance is less than 5.0 ohms. The machine harness and the "Backup Crane" switch are correct. Proceed to Test Step 3.
NOT OK - The resistance is greater than 5.0 ohms. There is an open circuit in the machine harness