LOCKNUT 1A5823 - Caterpillar

MID 161 CID 1888 FMI 14Conditions Which Generate This Code:This diagnostic code is recorded when the diagnostic circuit in the PL522 and 523 identifies a fault in the GPS antenna system.Test Step 1. ACCESS THE PL522 or 523 THROUGH CATERPILLAR ELECTRONIC TECHNICIAN (CAT ET ).
Connect the Cat ET service tool to the machine.
Verify that the ECM (VIMS Main Module) is present. Expected Result:The ECM (VIMS Main Module) is present.Results:
OK - The ECM (VIMS Main Module) is present. Proceed to Test Step 3.
NOT OK - The ECM (VIMS Main Module) is not present in the Cat ET screen.Repair: Verify that the wiring for the PL522 or 523 has been installed correctly. Check the wiring with a multimeter. If the ECM ( VIMS Main Module) is not present, refer to Systems Operation, Troubleshooting, Testing and Adjusting, "Electronic Service Tool Does Not Communicate with ECM".STOPTest Step 2. VERIFY IF THE MACHINE HAS MOVEDVerify if the machine has moved more than the configured minimum distance since the last known position report.Expected Result:The machine has not moved.Results:
OK - The machine has moved less than the configured minimum distance since the last known position report. Therefore, the machine has not sent any position reports.STOP
NOT OK - The machine movement is unknown. Proceed to Test Step 3.Test Step 3. VERIFY THAT THE PRODUCT LINK MODULE IS IN POWER MODE 1.
Select "Status Parameters" for Cat ET.
Verify that the "Power Mode Status" is "Power Mode 1". Verify that the "Key Switch Status" is "On". Expected Result:The machine is in "Power Mode 1" and "Key Switch On".Results:
OK - The screens for Cat ET display "Power Mode 1". Proceed to Test Step 4.
NOT OK - Cat ET screens are not correct. Proceed to Test Step 4.Test Step 4. VERIFY THAT THE GPS RECEIVER FUNCTIONS.
Select "GPS Information" for Cat ET.
Verify that the "GPS Position Status" is "Valid".
Verify that the GPS has calculated a location within the configured amount of time ("GPS Fix Validity Time Duration"). The "GPS Time Stamp" can be compared to the "PC Current Date/Time" in order to calculate the time since the last calculation of the position.
Select "Status Parameters". Verify "GPS Receiver" states "Functional". Expected Result:The "GPS Position Status" is "Valid". The last calculation (GPS) of the position was within the configured amount of time ("GPS Fix Validity Time Duration") in "Power Mode 1".Results:
OK - The indications on the Cat ET screen are correct. The GPS Receiver is functioning properly. Proceed to Test Step 6.
NOT OK - The indications on the "GPS Information" are incorrect. Proceed to Test Step 5.
NOT OK - The indications on the "GPS Receiver" are not "Functional". Proceed to Test Step 5.Test Step 5. VERIFY THAT THE CENTER CONDUCTOR OF THE ANTENNA HAS NOT SHORTED TO THE SHIELD.
Disconnect the connection of the GPS antenna at the module.
Measure the resistance from the shield of the antenna cable to the conductor at the center of the cable. The shield is the threaded part of the connector. Refer to Systems Operation, Troubleshooting, Testing and Adjusting,