MONITOR AR-COM 5105926 - Caterpillar

Illustration 1 g02759877
Schematic of the Implement Lockout switch
This diagnostic code is associated with the Implement Lockout switch. This switch has two inputs to the ECM: a normally open circuit (wire E918-GN(Green)) and a normally grounded circuit (wire E917-WH(White)). During normal operation, one switch input is open and the other input is grounded. If each input is in the same state, the ECM will detect a diagnostic code. This diagnostic code is detected when both switch inputs are grounded at the same time.The possible causes of this diagnostic code are listed below:
Short to the ground circuit.
The circuit is shorted.
A failed switch
The ECM may have failed. This condition is unlikely.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 0490 FMI 04 is active before performing this procedure.Note: Use the 146-4080 Digital Multimeter for the measurements in this procedure.Test Step 1. CHECK THE CIRCUIT FOR THE SWITCH.
Turn the disconnect switch and the key start switch to the OFF position.
Disconnect the J1 and J2 machine harness connectors from the Machine ECM.
At the J1 machine harness connectors, measure the resistance from contact J1-63 (wire E918-GN(Green)) to contact J2-22 (wire J878-YL(Yellow)) with the switch in the Enabled position and the Disable positions.
At the J1 machine harness connector, measure the resistance from contact J1-64 (wire E917-WH(White)) to contact J2-22 (wire J878-YL(Yellow)) with the switch in the Disabled position and the Enabled position. Expected Result:The measurement of the resistance should be between 5 ohms and 5000 ohms for each switch position.Results:
YES - The resistance is correct for each measurement. Proceed to test step 3.
NO - The resistance measurement is greater than 5000 ohms for one or both measurements. The harness or the switch has failed. Proceed to test step 2.Test Step 2. CHECK FOR A SHORT.
Disconnect the switch from the harness.
At the J1 machine harness connector, measure the resistance from contact J1-63 and contact J1-64 to all other J1 contacts. Expected Result:The resistance measurement should be greater than 5000 ohms for each measurement.Results:
OK - The resistance measurement is greater than 5000 ohms for each measurement.Repair: Replace the switch.Proceed to Test Step 3.
NOT OK - The resistance measurement is not greater than 5000 ohms for one or more measurements.Repair: The short is in the circuit with the low resistance measurement. Repair the harness or replace the harness. Verify that the problem has been corrected.STOPTest Step 3. CHECK IF THE DIAGNOSTIC CODE REMAINS
Inspect the contacts of the harness connectors and clean the harness connectors.
Reconnect all the harness connectors.
Turn the disconnect switch and the key start switch to the ON position.
Operate the machine.
Check the status of the CID 0490 FMI 04 diagnostic code. Expected Result:The CID 0490 FMI 04 diagnostic code is active. Results:
YES - The CID 0490 FMI 04 diagnostic code is active. The diagnostic code has not been corrected. The ECM may have failed.Repair: Failure of the ECM is unlikely. Exit