LINK AS-TRACK 6T1279 - Caterpillar

Illustration 1 g02789461
Schematic of the "Boom Cylinder Extend Limit" Solenoid
This diagnostic code is associated with the "Boom Cylinder Extend Limit" Solenoid. The FMI 06 diagnostic code means that the Machine ECM has determined that the current of the solenoid circuit is above normal. Some possible causes of this diagnostic code are listed below:
The energize circuit of the solenoid is shorted to ground.
The solenoid has failed.
The Backup Crane switch 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
Turn the disconnect switch and the key start switch to the ON position. Do not start the engine.
Observe the status of the diagnostic code.
Disconnect the solenoid from the machine harness. Expected Result:The active CID 2420 FMI 06 diagnostic code changes to a CID 2420 FMI 05 diagnostic code when the solenoid is disconnected.Results:
YES - The active CID 2420 FMI 06 diagnostic code changes to a CID 2420 FMI 05 diagnostic code when the solenoid is disconnected. The circuit is correct.Repair: The solenoid has failed. Repeat this test "CHECK THE SOLENOID" in order to verify the solenoid failure. Replace the solenoid.STOP
NO - The CID 2420 FMI 06 remains active when the solenoid is disconnected. The solenoid is not the cause of the problem. Proceed to Test Step 3.Test Step 2. CHECK THE OPERATION OF THE BACKUP CRANE SWITCHThe disconnect switch and the key start switch remain OFF. The machine harness connectors for the solenoid and the ECM remain disconnected.
Remove the "Backup Crane" switch from the wiring harness.
Measure the resistance between pin 11 and pin 12 of the switch.
Toggle the switch to the ON position.
Measure the resistance between pin 11 and pin 12 of the switch.
Toggle the switch to the OFF position.
Measure the resistance between pin 11 and pin 12 of the switch.
Reconnect the switch to the wiring harness. Expected Result:The switch should be open in the OFF position and closed in the ON position.Results:
OK - The switch operates as expected. Proceed to Test Step 3.
NOT OK - The switch is either open for both positions or closed for both positions.Repair: Replace the switch.STOPTest Step 3. CHECK THE ENERGIZE CIRCUIT OF THE SOLENOID FOR A SHORT TO GROUND
Turn the key start switch and the disconnect switch to the OFF position.
The solenoid remains disconnected from the machine harness.
Disconnect the machine harness connectors J1 and J2 from the ECM.
At the machine