SEAL 773637 - Caterpillar

Illustration 1 g01159183
This diagnostic code is associated with the Auto/Manual Switch for the left side of the Motor Grader. The FMI 04 means that the ECM has determined that the normally open and normally closed contacts are both in an closed state.The possible causes of this diagnostic code are listed:
The switch has failed.
The normally open circuit of the switch is shorted to ground.
The ECM has failed. This is unlikely. Note: The following test procedure may create other diagnostic codes. Ignore these created diagnostic codes and clear the diagnostic codes when the original diagnostic code has been corrected. Ensure that the diagnostic code of CID 2258 FMI 04 is active before performing this procedure.Note: Use the 146-4080 Digital Multimeter for the measurements in this procedure.System Response:When this diagnostic code is active the hydraulic control system will default to the "Auto Not Allowed" state.Test Step 1. CHECK THE SWITCH
Turn the key start switch and the disconnect switch to the OFF position.
Disconnect the machine harness connector from the switch.
Use a Multimeter to verify the proper operation of the switch. Refer to Table 1 for the switch operation.
Table 1
Contacts A to B    Contacts C to B    Switch Status    
Less than 5 ohms     Greater than 5000 ohms     Switch Not Pressed    
Greater than 5000 ohms     Less than 5 ohms     Switch Pressed    Expected Result:The switch is operating correctly.Results:
OK - The switch is operating correctly. Proceed to Test Step 2
NOT OK - The switch is not functioning correctly. There is an internal failure in the switch.Repair: Replace the switch.STOPTest Step 2. CHECK THE N/O SWITCH CIRCUIT IN THE HARNESS
The key start switch and the disconnect switch remain in the OFF position.
Disconnect the machine harness connectors from the ECM.The switch remains disconnected.
At the machine harness connector for the ECM, measure the resistance from contact "J1-41 (wire Y937-PU)" to contact "J1- 56 wire (C209-BK)".Expected Result:The resistance is greater than 5000 ohms.Results:
OK - The resistance is greater than 5000 ohms. The machine harness is correct. Proceed to Test Step 3.
NOT OK - The resistance is less than 5 ohms. The circuit is open.Repair: Repair the machine harness or replace the machine harness.STOPTest Step 3. CHECK IF THE DIAGNOSTIC CODE IS STILL ACTIVE.
Inspect the contacts and clean the contacts of the harness connectors.
Reconnect all harness connectors.
Turn the disconnect switch and the key start switch to the ON position.
Operate the machine.
Determine if the CID 2258 FMI 04 is active.Expected Result:The CID 2258 FMI 04 is not active.Results:
YES - The CID 2258 FMI 04 is not active. The problem has not been corrected. The ECM may have failed.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
NO - The CID 2258 FMI 04 is active. The problem has not been corrected. The ECM may have failed.Repair: It is unlikely that the ECM has failed. Exit this procedure and perform this procedure again.