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| Illustration 1 | g03338350 |
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Schematic of the Cat Data Link circuit | |
This diagnostic code is associated with the information from the Chassis ECM to the Transmission ECM. The information is sent via the Cat® Data Link. The Cat Data Link is connected to two inputs of the Transmission ECM.
The FMI 09 diagnostic code means the Transmission ECM has not received expected information from the Chassis ECM.
The possible causes of this diagnostic code are listed:
- The wires for the Cat Data Link to the Chassis ECM are open or the wires are shorted.
- The wrong software is installed on an ECM.
Note: The following test procedure may create other diagnostic codes. Ignore these diagnostic codes and clear the diagnostic codes when the original diagnostic code has been corrected. Ensure that the diagnostic code of CID 1273 FMI 09 is active before performing this procedure.
Test Step 1. VERIFY THE HARDWARE AND THE SOFTWARE PART NUMBERS
- Verify that the following information is correct:
- The part number of the software for the Chassis ECM
- The part number of the software for the Transmission ECM
- The part number of the Chassis ECM
- The part number of the Transmission ECM
Note: Consult your Caterpillar dealer for the correct part numbers of the software.
Expected Result:
All of the part numbers are correct.
Results:
- YES - All of the part numbers are correct. Proceed to Test Step 2.
- NO - One or more of the part numbers are not correct.
Repair: Replace the incorrect ECM with an ECM that has the correct part number. Install the correct software. Refer to Troubleshooting, Testing and Adjusting, "Electronic Control Module (ECM) - Replace" and Troubleshooting, Testing and Adjusting, "Electronic Control Module (ECM) - Flash Program".
STOP
Test Step 2. INSPECT THE HARNESS CONNECTIONS
- Turn the disconnect switch and the key start switch to the OFF position.
- Inspect all harness connections that are related to the Cat Data Link. Make sure that the connectors are clean and tight.
- Check the connectors for proper mating. Ensure that all the seals are present and in place.
- Check the harness for signs of damage or abrasion.
- Check the wires at the connector. Ensure that the wires are secured tightly into the connector. Take care not to pull the wire out of the connector.
- Check the exposed wires at the connectors for nicks or signs of abrasion.
- Check for moisture inside the connector.
- Check the connectors for dirty contacts or corroded contacts.
- Check each pin and each socket of the machine harness connectors. Ensure that the contacts are properly installed. The contacts should mate correctly when the two pieces of the connector are placed together.
Expected Result:
The machine harness connectors are tight and free of corrosion.
Results:
- YES - The machine harness connectors are tight and free of corrosion. Proceed to Test Step 3.
- NO - The machine harness connectors are in need of repair.
Repair: Repair the machine harness or replace the machine harness.
STOP
Test Step 3. CHECK FOR A SHORT CIRCUIT IN THE HARNESS
- The disconnect switch and the key start switch remain in the OFF position.
- Disconnect the machine harness connectors from all electronic control modules that use the Cat Data Link.
- At the machine harness connector for the Transmission ECM, measure the resistance between connector contact J1-10 (wire 893-GN(Green)) and all of the contacts that are used in the machine harness connector for the ECM. Perform the same measurements for J1-20 (wire 892-BR(Brown)).
Expected Result:
Each resistance measurement is greater than 5 ohms.
Results:
- YES - Each of the resistance measurements is greater than 5 ohms. The harness circuit resistance is correct. Proceed to Test Step 4.
- NO - One or more of the resistance measurements are less than 5 ohms. The machine harness has failed.
Repair: There is a short between contacts 10 (wire 893-GN(Green)) or 20 (wire 892-BR(Brown)) of the Cat Data Link and the circuit with the low resistance measurement. Repair the machine harness or replace the machine harness.
STOP
Test Step 4. CHECK FOR AN OPEN CIRCUIT
- The disconnect switch and the key start switch remain in the OFF position.
- All related electronic control modules remain disconnected from the machine harness.
- Measure the resistance between connector contact J1-10 (wire 893-GN(Green)) of the Chassis ECM and connector contact J1-10 (wire 893-GN(Green)) of the Transmission ECM.
- Measure the resistance between connector contact J1-20 (wire 892-BR(Brown)) of the Chassis ECM and connector contact J1-20 (wire 892-BR(Brown)) of the Transmission ECM.
Expected Result:
The resistance is less than 5 ohms.
Results:
- YES - The resistance is less than 5 ohms. The Cat Data Link circuit in the machine harness is correct. Proceed to Test Step 5.
- NO - The resistance is greater than 5 ohms. The machine harness has failed.
Repair: The Cat Data Link circuit is open in the machine harness. Repair the machine harness or replace the machine harness.
STOP
Test Step 5. CHECK IF THE DIAGNOSTIC CODE REMAINS
- Inspect the contacts of the harness connectors and clean the contacts.
- Reconnect all harness connectors.
- Turn the disconnect switch and the key start switch to the ON position.
- Operate the machine.
- Check the status of the CID 1273 FMI 09 diagnostic code.
Expected Result:
The CID 1273 FMI 09 diagnostic code is active.
Results:
- YES - The CID 1273 FMI 09 diagnostic code is active. The diagnostic code has not been corrected. The ECM may have failed.
Repair: An ECM failure is unlikely. Exit this procedure and perform this procedure again. If the cause of the diagnostic code is not found, replace the ECM. Refer to Troubleshooting, Testing and Adjusting, "Electronic Control Module (ECM) - Replace".
STOP
- NO - The CID 1273 FMI 09 diagnostic code is not active. The diagnostic code does not exist at this time.
Repair: 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. Resume normal machine operation.
STOP