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| Illustration 1 | g02888579 |
Schematic of the Laser Catcher circuit | |
This diagnostic code is associated with the laser receiver. The laser receiver is sending data that is one of the following:
- Intermittent
- Incorrect
- Invalid
Test Step 1. CHECK THE PLACEMENT OF THE LASER TRANSMITTER
- Verify that the laser transmitter is at least 10 to 15 feet away from the machine.
Expected Result:
The laser transmitter is placed in the proper position.
Results:
- YES - The laser transmitter is placed at least 10 to 15 feet away from the machine. Proceed to Test Step 2.
- NO - The laser transmitter is NOT placed at least 10 to 15 feet away from the machine.
Repair: Position the laser transmitter 10 to 15 feet away from the machine.
STOP
Test Step 2. CHECK FOR AN OPEN IN THE CAN DATA LINK
- Place the key start switch and the disconnect switch in the OFF position.
- Disconnect the machine harness connectors "J1" and "J2" from the Machine ECM.
- At the harness connectors for the ECM, measure the resistance from contact "J2-45" (wire Y787-YL) to contact "C" of the quick disconnect. Measure the resistance from "J2-46" (wire Y788-GN) to contact "D" of the quick disconnect.
Expected Result:
Each resistance measurement is 60 (±5) ohms.
Results:
- YES - Each resistance measurement is 60 (±5) ohms. The circuit for the CAN data link is NOT open. Proceed to Test Step 3.
- NO - The resistance measurement is greater than 70 ohms. There is an open or a bad connection in the circuit for the CAN data link.
Repair: A resistance measurement that is greater than 5000 ohms could indicate that a wire is not connected or that a wire is open. A resistance greater than 70 ohms but less than 5000 ohms indicates a connection point is not open but is not a good connection.Refer to the complete Electrical System Schematic of the machine. Check all of the connectors that are in the circuit for the CAN data link. Ensure that all of the connections are clean, that all of the connections are secure and that all of the connections are in good condition. Repair the machine harness or replace the machine harness.
STOP
Test Step 3. CHECK THE CAN DATA LINK FOR A SHORT TO GROUND
- The key start switch and the disconnect switch remain in the OFF position.
- Disconnect the J1 and J2 connectors from the ECM.
- Measure the resistance between contact J2-45 (wire Y787-YL) and all pins on the machine harness. Measure the resistance between contact J2-46 (wire Y788-GN) and all pins on the machine harness. Note the resistance.
Expected Result:
The resistance measurements are greater than 5000 ohms.
Results:
- YES - Each resistance measurement is greater than 5000 ohms. The CAN data link is not shorted to another circuit in the machine harness.
Repair: Contact your technical communicator for a possible consultation with Caterpillar.
STOP
- NO - One or more of the resistance measurements is less than 5000 ohms. There is a short in the machine harness.
Repair: A wire in the circuit for the CAN data link is shorted.Refer to the complete Electrical System Schematic of the machine. Examine all of the connectors in the circuit.For additional information on testing short circuits and locating short circuits, refer to Testing and Adjusting, "Wiring Harness (Short Circuit) - Test". Repair the machine harness or replace the harness.
STOP