LIFTER-FLYWH. 8F4423 - Caterpillar

Illustration 1 g02413356
CAN A Data Link Network connections.This diagnostic code is associated with communication between the Machine ECM and the Implement ECM 2 conducted over the "CAN A" data link. The FMI 09 diagnostic code means that the Machine ECM has lost communication with the Implement ECM 2. The possible causes of this diagnostic code are listed below:
An open or a poor connection in the "CAN A" data link circuit.
The Implement ECM 2 has failed. This situation is unlikely
The Machine ECM has failed. This situation is unlikely.Test Step 1. CHECK THE DATA LINK CIRCUIT FOR AN OPEN
Turn the key switch and the disconnect switch to the OFF position.
Refer to the illustration for the CAN network at the beginning of this procedure. Disconnect all components that are on the CAN network from the machine harness including the CAN resistors.
Inspect the harness connectors. Clean all of the contacts of all of the harness connectors. Ensure that the wires are secured in the connector, the contacts are clean, and the contacts are in good condition.
At the disconnected harness connector for the Implement ECM 2, connect a jumper wire between contact 64 (wire F711-GN) and contact 65 (wire F712-GY).
At the disconnected harness connector J2 for the Machine ECM, measure the resistance between contact J2-67 (wire F711-GN) and contact J2-68 (wire F712-GY).Expected Result:The resistance measurement is 5 ohms or less.Results:
OK - The resistance measurement is 5 ohms or less than 5 ohms. The "CAN A" data Link circuit between the Implement ECM 2 and the Machine ECM is not open. Proceed to Test Step 2.
NOT OK - The resistance measurement is greater than 5 ohms.Repair: There is an open or a bad connection in the "CAN A" data link circuit in the machine harness. Refer to the Electrical System Schematic of the machine. Locate and examine all of the machine harness connections that are involved in the data link circuit. Check each wire section from connector to connector for an open or a bad connection. Ensure that all connections are clean, secure and in good condition. Repair the machine harness or replace the machine harness.STOPTest Step 2. CHECK THE STATUS OF THE DIAGNOSTIC CODE
Perform a 45 N (10 lb) pull test on each of the wires that are associated with the data link circuit.
Reconnect all harness connectors. Make sure that the connectors are fully seated. Observe that the clips for each connector are fastened securely.
Turn the disconnect switch and the key start switch to the ON position.
Operate the machine.
Check the status of the CID 1558 FMI 09 diagnostic code.Expected Result:The CID 1558 FMI 09 diagnostic code is not active. Results:
OK - The CID 1558 FMI 09 diagnostic code is not active. The diagnostic code does not exist at this time. The initial diagnostic code was probably caused by a poor connection or a short at one of the connectors. Resume normal operation.STOP
NOT OK - The CID 1558 FMI 09 diagnostic code is active. The diagnostic code has not been corrected.Repair: Check the circuit again.