TRANSMISSION AR-DIRECT DRIVE 4779556 - Caterpillar

Illustration 1 g02662216
Cat Data Link connectionsThe CID 2448 FMI 09 diagnostic code is associated with the communication between the Transmission ECM and the Graphical Display Module that is conducted on the Cat Data Link circuit.The FMI 09 means that the Transmission ECM is not receiving any communication from the Graphical Display Module over the Cat Data Link circuit. The possible causes of the CID 2448 FMI 09 diagnostic code are listed below:
An open connection or a poor connection in the Cat Data Link circuit
The Graphical Display Module has failed. This situation is unlikely
The Transmission ECM has failed. This situation is unlikely.Note: A loss of system power to the Graphical Display Module can cause the Transmission ECM to activate this diagnostic code. Ensure that the Graphical Display Module is powered up before proceeding with this procedure.Note: Ensure that the CID 2448 FMI 09 diagnostic code is active before performing this procedure.Test Step 1. CHECK THE CAT DATA LINK CIRCUIT FOR AN OPEN
Turn the key start switch and the disconnect switch to the OFF position.
Disconnect the machine harness connector J1 from the Transmission ECM. Disconnect the machine harness connector from the Graphical Display Module.
Inspect the harness connectors and clean all of the contacts of the harness connectors. Refer to the illustration above in order to check the Cat Data Link connection on each of the machine harness connectors. Ensure that the wires are secured in the connector, that the contacts are clean and that the contacts are in good condition.
At the disconnected harness connector for the Graphical Display Module, connect a jumper wire between contact 12 (wire 893-GN) and contact 13 (wire 892-BR).
At the disconnected harness connector J1 for the Transmission ECM, measure the resistance between contact J1-10 (wire 893-GN) and contact J1-20 (wire 892-BR).Expected Result:The resistance measurement is less than 5 ohms.Results:
OK - The resistance measurement is less than 5 ohms. The Cat Data Link circuit in the machine harness is not open. Proceed to Test Step 2.
NOT OK - The resistance measurement is greater than 5 ohms. There is an open or a bad connection in the Cat Data Link circuit in the machine harness.Repair: A resistance measurement that is greater than 5 ohms but less than 5000 ohms could indicate that one of the wires or one of the connection points in the circuit is not open but is not a good connection. Refer to the complete Electrical System Schematic of the machine. Examine all of the connections of the machine harness 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, that all connections are secure and that all connections are 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