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| Illustration 1 | g02723104 |
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Schematic of the Cat Data Link | |
This diagnostic code is associated with the communication between the Implement ECM and the Advisor Display that is conducted over the Cat Data Link. The FMI 09 code means that the Implement ECM has lost communication with the Advisor Display.
The possible causes of this diagnostic code are listed below:
- An open connection exists in the circuit for the Cat® Data Link.
- The Advisor Display has failed. This condition is unlikely.
- The ECM has failed. An ECM failure is unlikely.
Note: If the Advisor Display is not operating correctly, refer to UENR2421 for information on troubleshooting the Advisor Display. Ensure that the diagnostic code is active before performing this procedure. Check the Advisor Display for correct operation before performing this procedure.
System Response:
- Implement ECM features will not work properly. This fault must be cleared and the ECM reset before normal Implement ECM functionality can begin.
Note: A digital multimeter is required for taking measurements in this procedure.
Test Step 1. CHECK THE DATA LINK CIRCUIT FOR AN OPEN.
- Turn the key start switch and the disconnect switch to the OFF position.
- Disconnect the connector of the machine harness J1 from the Implement ECM. Disconnect the machine harness connector from the Advisor Display.
- Inspect the harness connectors and clean all of the contacts of the harness connectors. Refer to the illustration above in order to check the connection of the Cat® Data Link on each of the machine harness connectors. Ensure that the wires are secured in the connector and in good condition.
- At the disconnected harness connectors, measure the resistance from contact J1-10 wire 893-GN(Green)of the Implement ECM to contact 8 wire 893-GN(Green)of the Advisor.
- At the disconnected harness connectors, measure the resistance from contact J1-20 wire 892-BR(Brown)of the Implement ECM to contact 9 wire 892-BR(Brown)of the Advisor.
Expected Result:
Both of the resistance measurements are less than 5 ohms.
Results:
- OK - Both of the resistance measurements are less than 5 ohms. The Cat® Data Link circuit in the machine harness is not open. Proceed to Test Step 2.
- NOT OK - At least one of the resistance measurements is more than 5 ohms.
Repair: There is an open or a bad connection in the Cat® Data Link circuit in the machine harness. Refer to the complete Electrical System Schematic of the machine. Locate all the connectors and examine all of the connectors of the machine harness that are involved in the data link circuit. Check each wire that is involved in the circuit 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.
STOP
Test Step 2. CHECK IF THE DIAGNOSTIC CODE REMAINS.
- Inspect the harness connectors. Clean the contacts of the harness connectors and check the wires for damage to the insulation caused by excessive heat, battery acid, or chafing.
- Perform a
45 N (10 lb) pull test on each of the wires that are associated with the circuit. - Reconnect all harness connectors in order to make sure that the connectors are fully seated. Also, make sure that the clips for each connector are fastened and secure.
- Turn the disconnect switch and the key start switch to the ON position.
- Operate the machine.
- Determine if the diagnostic code is active.
Expected Result:
The diagnostic code is active.
Results:
- YES - The diagnostic code is active. The problem has not been corrected.
Repair: Check the circuit again. An ECM failure is unlikely that the ECM has failed. Exit this procedure and perform this procedure again. Prior to replacing an ECM, always contact your dealership for possible consultation with Caterpillar. This consultation may greatly reduce repair time. If the ECM requires replacement, refer to Testing and Adjusting, "Electronic Control Module (ECM) - Replace".
STOP
- NO - The diagnostic code is not active. The initial diagnostic code was probably caused by a poor electrical connection or a short at one of the harness connectors that was disconnected and reconnected. The problem does not exist at this time. Resume normal machine operation.
STOP