PLATE AS 1073196 - Caterpillar

MID 039 - Machine Control Module CID 3456 - Autonomous Steering Enable Solenoid #1 Return FMI 04 - Voltage Below Normal
Illustration 1 g03257116This diagnostic code is active when the Machine Control Module (MCM) has determined the Autonomous Steering Enable Solenoid #1 (Primary EH Steer Pilot SOL [P1]) return voltage is below normal.Test Step 1. CHECK THE RETURN CIRCUIT OF THE SOLENOID FOR A SHORT TO THE GROUND CIRCUIT
Turn the keyswitch and the disconnect switch to the OFF position.
Disconnect the machine harness connector from the solenoid. Disconnect the machine harness connectors J-1 and J-2 from the Input/Output Module (I/O Module).
At the machine harness I/O Module connector J1, measure the resistance from contact J1-67 (wire A827-OR(Orange)) to all J-1 and J-2 contacts that are connected to +battery. 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 J1-67 (A827-OR(Orange)) and the circuit that has a low resistance measurement.Repair: Repair the machine harness or replace the machine harness.STOPTest Step 2. CHECK IF THE DIAGNOSTIC CODE IS STILL ACTIVE
Inspect the contacts of the harness connectors that are used in the solenoid circuit. Ensure that the contacts are secure. Clean all of the contacts in the harness connectors.
Reconnect all harness connectors.
Turn the disconnect switch and the keyswitch to the ON position.
Operate the machine.
Determine if the CID 3456 FMI 04 is active. Expected Result:The CID 3456 FMI 04 is active.Results:
YES - The CID 3456 FMI 04 is active.Repair: Repeat this procedure. If the problem remains, replace the solenoid. After the solenoid is replaced, repeat this Test Step again. If the diagnostic code is still active, the I/O Module may be faulty. It is unlikely that the I/O Module has failed. Exit this procedure and perform this procedure again. If the cause of the diagnostic code is not found, replace the I/O Module. Refer to Testing and Adjusting, KENR8394, "Electronic Control Module (ECM) - Replace".STOP
NO - The CID 3456 FMI 04 is not active. The problem does not exist at this time.Repair: The initial diagnostic code was probably caused by a poor electrical connection or a short at one of the harness connectors that was disconnected and reconnected. Resume normal machine operation.STOP