RING 8U2516 - Caterpillar

Illustration 1 g01433018
Schematic for the E-Stop SwitchesThis diagnostic code is associated with the E-Stop Switches. The FMI 02 means that the Implement (Screed) ECM determined that the signal is intermittent, erratic, or incorrect. The ECM could be receiving invalid combinations from the circuit.Note: The Implement (Screed) ECM is located under the Screed Platform.Conditions that could cause this diagnostic code to be activated are:
There is an open or grounded wire between A314-OR and the Implement ECM.
There is an open wire or a grounded wire between 419-YL and the Implement ECM.
One or more of the E-Stop switches have failed.
There is an open on wire 201-BK.
There is an open on wire 200-BK.
The Implement ECM has failed. This is unlikely. System Response:When this diagnostic code is active, the following occurs:
Machine immediately comes to a stop.
Propel is disabled.
The following pop-up message shows on graphical display: "Screed E-Stop switch has an active fault. E-Stop can not be activated from screed."
Alarm horn is active.
Operator station fault lamp is active.Note: Before performing this procedure, inspect the harness connectors that are involved in the circuit. Poor connections can often be the cause of a problem in an electrical circuit. Verify that all connections in the circuit are clean, secure and in good condition. If a problem with a connection is found, correct the problem and verify that this diagnostic code is active before performing this procedure. Test Step 1. CHECK THE CONTINUITY OF THE SWITCHES IN THE RELEASE POSITION
Turn the key start switch to the OFF position.
Unplug the switch from the wire harness.
Place the switches in the RELEASE position.
With the switches in the RELEASE position, check the resistance from terminal 1 to terminal 2 for each switch. Check the resistance from terminal 3 to terminal 4 for each switch.Expected Result:The resistance should be less than 5 ohms on terminals 1 and 2 for each switch. The resistance should be greater than 5000 ohms on terminals 3 and 4 for each switch.Results:
OK - The resistances are correct. Proceed to Test Step 2.
NOT OK - The resistance is not less than 5 ohms from terminal 1 to terminal 2 for each switch. The resistance is not greater than 5000 ohms from terminal 3 to terminal 4 for each switch.Repair: One or both switches has failed. Replace the switch or switches.STOPTest Step 2. CHECK THE CONTINUITY OF THE SWITCHES IN THE SET POSITION
Press and hold the switches in the SET position.
With the switches in the SET position, check the resistance from terminal 1 to terminal 2 for each switch. Check the resistance from terminal 3 to terminal 4 for each switch.Expected Result:The resistance should be less than 5 ohms from terminal 3 to terminal 4 for each switch. The resistance should be greater than 5000 ohms from terminal 1 to terminal 2 for each switch.Results:
OK - The resistances are correct. Proceed to Test Step 3.
NOT OK - The resistance is not less than 5 ohms from terminal 3 to terminal 4 for each switch. The resistance is not greater than 5000