CYLINDER BLOCK GP 7N8706 - Caterpillar

Illustration 1 g01531194
Schematic of the Hook Speed Select Solenoid CircuitNote: Diagnostics may lead to the replacement of the hook motor solenoid. This solenoid is part of the actual hook motor. Replace the entire hook motor assembly if the solenoid is faulty.This diagnostic code is associated with the Hook Speed Select Solenoid. The FMI 04 means that the ECM has determined that the voltage of the solenoid circuit is below normal. The possible causes of this diagnostic code are listed:
The energize circuit of the solenoid is shorted to ground.
The solenoid has failed.
The ECM has failed. This 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 and secure. Make sure that all of the connections are 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. Ensure that the diagnostic code of CID 2950 FMI 04 is active before performing this procedure.Note: Use a Digital Multimeter for the measurements in the procedure.System Response:A level 2 warning will be generated.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 with the active diagnostic code from the machine harness. Expected Result:CID 2950 FMI 04 changes to CID 2950 FMI 05 when the solenoid is disconnected.Results:
YES - CID 2950 FMI 04 changes to CID 2950 FMI 05 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 - CID 2950 FMI 04 remains active. Proceed to Test Step 2.Test Step 2. 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 connector from the control.
At the machine harness connector, measure the resistance from the signal contact 40 (wire J921-PK) 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 3.
NOT OK - Each resistance measurement is not greater than 5000 ohms. There is a short in the machine harness. The short is between 40 (wire J921-PK) and the circuit with the low resistance measurement.Repair: Repair the machine harness or replace the machine harness. STOPTest Step 3. CHECK IF THE DIAGNOSTIC CODE REMAINS.
Inspect the harness connectors and clean the contacts of the harness connectors.
Reconnect all harness