GEAR 3862096 - Caterpillar

Illustration 1 g01523595
Partial SchematicTest Step 1. CYCLE THE POWER TO THE SYSTEM.
Move the "Power/Setup" switch on the display to the "OFF" position.
Turn the key start switch for the machine to the "OFF" position.
Turn the key start switch for the machine to the "ON" position.
Move the "Power/Setup" switch on the display to the "ON" position.
Check the status of the system components on the "Diagnostics" screen.Make sure that all the required components are shown as "Connected".Expected Result:All system components show as "Connected" in the "Diagnostics" screen.Results:
YES - All of the system components are shown as "Connected" in the "Diagnostics" screen.Repair: The issue was caused by the internal CAN data link wiring of the display. Cycling the power to the system has reset the display. Return the machine to normal operation.STOP
NO - All of the system components are not shown as "Connected" in the "Diagnostics" screen. Proceed to Test Step 2.Test Step 2. CHECK THE RESISTANCE OF THE CAN DATA LINK.
Place the key start switch and the disconnect switch in the "ON" position.
Take the following measurement at the connector for the sensor that is communicating on the AccuGrade CAN data link. Measure the resistance between contact C (wire 252-YL) and contact D (wire 262-GN).Expected Result:The resistance measurement is 60 6 ohms.Results:
YES - The resistance measurement is 60 6 ohms. Proceed to Test Step 4.
NO - The resistance measurement is NOT 60 6 ohms. Proceed to Test Step 3.Test Step 3. CHECK THE TERMINATION RESISTOR.
Disconnect the 3-pin connector for both of the termination resistors.
Measure the resistance across contact A and contact B for one resistor. Measure the resistance across contact "A" and contact "B" for the other resistor. Note the resistance.Expected Result:The resistance measurements are 120 12 ohms.Results:
YES - The resistance measurements are 120 12 ohms. Reconnect the resistors. Proceed to Test Step 4.
NO - One or both resistance measurements is NOT 120 12 ohms.Repair: Replace the termination resistors that did not measure 120 12 ohms.STOPTest Step 4. CHECK THE CAN DATA LINK FOR SHORT TO GROUND.
The key start switch and the disconnect switch remain in the "OFF" position.
Measure the resistance between contact A (wire 252-YL) and frame ground. Measure the resistance between contact B (wire 262-GN) and frame ground. Note the resistance.Expected Result:The resistance measurements are