TUBE 3764868 - Caterpillar

Illustration 1 g02003553
Schematic of the Implement Lockout Switch
This diagnostic code is associated with the Rocker Switch (Implement Lockout). The switch is connected to two inputs of the ECM. The inputs are "Normally Open" and "Normally Closed". One of the inputs is open and the other input is grounded during proper operation.The FMI 04 means that the ECM has determined that the "Normally Open" and "Normally Closed" circuits are grounded.Ensure that the diagnostic code of CID 0490 FMI 04 is active before performing this procedure.Note: The following test procedure may create other diagnostic codes. Ignore these diagnostic codes and clear these diagnostic codes when the original diagnostic code has been corrected.System Response:The implements will not work.
Table 1
Switch Continuity
Switch / CID Switch
State Implement ECM
Connector Contact Number Status Wire Number
CID 0490 Implement Lockout Switch Not Locked J1-33 "N/O"(1) O(2) E917-WH(White)
J1-34 "N/C"(3) G(4) E918-GN(Green)
Locked J1-33 "N/O" G E917-WH(White)
J1-34 "N/C" O E918-GN(Green)
(1) Normally Open Position
(2) Open
(3) Normally Closed Position
(4) GroundedTest Step 1. CHECK THE SWITCH
Turn the key start switch and the disconnect switch to the OFF position.
Disconnect the machine harness from the switch.
Turn the key start switch and the disconnect switch to the ON position. Expected Result:The CID 0490 FMI 04 has been replaced by CID 0490 FMI 03.Results:
OK - The CID 0490 FMI 04 has been replaced by CID 0490 FMI 03. The machine harness and the ECM are correct. Proceed to Test Step 3.
NOT OK - The CID 0490 FMI 04 is still active. Proceed to Test Step 2.Test Step 2. CHECK THE HARNESS
Turn the disconnect switch and the key start switch to the OFF position.
The machine harness remains disconnected from the switch.
Disconnect the machine harness connector(s) from the ECM.
Measure the resistance between contacts J1-33 (wire E917-WH(White)) and J1-34 (wire E918-GN(Green)) of the machine harness to all the contacts that are used in machine harness connectors for the ECM. Expected Result:Each resistance measurement is greater than 5000 ohms.Results:
YES - Each resistance measurement is greater than 5000 ohms. The ECM may have generated this diagnostic code in error.Repair: Exit this procedure and perform this procedure again. If the cause of the diagnostic code is not found, the ECM may need to be replaced. Prior to replacing an ECM, always contact your dealership for possible consultation with Caterpillar. This consultation may greatly reduce repair time. If the ECM requires replacement refer to Testing and Adjusting, "Electronic Control Module (ECM) - Replace".STOP
NO - One or more of the resistance measurements are less than 5000 ohms. The harness has failed. The short is between J1-33 (wire E917-WH(White)) and the circuit with the lowest resistance or the short is between J1-34 (wire E918-GN(Green)) and the circuit with the lowest resistance. Repair: Repair the wiring harness or replace the wiring harness.STOPTest Step 3. CHECK THE OPERATION OF THE SWITCH
The machine harness remains disconnected from the switch.
Connect one lead from a multimeter to contact 2 (wire 299-BK(Black)) of the harness connector for the switch.
Connect the other lead from a multimeter to contact 3 (wire E917-WH(White)) of the harness connector for the