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| Illustration 1 | g01185826 |
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Schematic of the Data Link Circuit | |
This diagnostic code is recorded when the ECM reads a diagnostic code that is internal to the ECM.
The possible causes of this diagnostic code are listed:
- The engine ECM has failed. There are no serviceable parts within the engine ECM.
- The Cat data link has failed.
Note: Ensure that the diagnostic code for the Engine ECM is active.
Test Step 1. VERIFY THAT THE DIAGNOSTIC CODE IS PRESENT.
- Turn the key start switch and the disconnect switch to the OFF position.
- Remove connectors J1 and J2 from the ECM and reconnect connectors J1 and J2 to the ECM.
- Turn the key start switch and the disconnect switch to the ON position.
- Clear all inactive diagnostic codes.
- Operate the machine.
- Check whether CID 0590 FMI 09 is present.
Expected Result:
The CID 0590 FMI 09 is NOT present.
Results:
- OK - The diagnostic code is NOT present. Resume normal machine operation.
STOP
- NOT OK - The diagnostic code remains present. Exit this procedure and perform this procedure again. If the problem remains, go to 2.
Test Step 2. CHECK FOR OTHER CODES.
- Check for similar diagnostic codes that are logged against other electronic control modules. If a similar diagnostic code is found, exit this test and perform the corresponding procedure(s) for the other diagnostic codes that are shown.
Expected Result:
Other diagnostic codes are showing.
Results:
- YES - Exit this procedure and perform the diagnostic procedure for the diagnostic codes that are shown.
STOP
- NO - There are no other related diagnostic codes. Proceed to test step 3.
Test Step 3. INSPECT THE HARNESS CONNECTORS.
- Turn the key start switch and the disconnect switch to the OFF position.
- Inspect the connections of the machine harness that are related to the CAT data link.
- Make sure that connectors are clean and tight.
Expected Result:
The machine harness is correct.
Results:
- OK - The machine harness is correct. Proceed to test step 4.
- NOT OK - The machine harness is not correct.
Repair: Repair the machine harness or replace the machine harness.
STOP
Test Step 4. CHECK FOR A SHORT TO GROUND.
- The key start switch and the disconnect switch remain in the OFF position.
- Disconnect the machine harness from all electronic control modules that use the CAT data link.
- At the machine harness connector for the ECM, measure the resistance between frame ground and the CAT data link circuits (contacts J1-10 and J1-20).
Expected Result:
The resistance measurement should be greater than 5000 ohms.
Results:
- YES - The resistance is less than 5000 ohms.
Repair: The machine harness has failed. There is a short between frame ground and the CAT data link circuit in the machine harness. Repair the machine harness or replace the machine harness.
STOP
- NO - The resistance is greater than 5000 ohms. The harness circuit resistance is correct. Proceed to test step 5.
Test Step 5. CHECK FOR A SHORT TO THE +BATTERY CIRCUIT.
- The key start switch and the disconnect switch remain in the OFF position.
- All related control modules remain disconnected from the machine harness.
- At the harness for the transmission ECM, measure the resistance between the CAT data link circuits (contacts J1-10 and J1-20) and the following contacts for the +battery circuit: J1-31, J1-38, J1-39 and J1-47
Expected Result:
The resistance is greater than 5000 ohms.
Results:
- OK - The resistance is greater than 5000 ohms. The harness circuit resistance is correct. Proceed to test step 6.
- NOT OK - The resistance is less than 5000 ohms.
Repair: The harness has failed. There is a short between the +battery contact and the CAT data link circuit in the machine harness. Repair the machine harness or replace the machine harness.
STOP
Test Step 6. CHECK FOR AN OPEN HARNESS.
- The key start switch and the disconnect switch remains in the OFF position.
- All related control modules remain disconnected from the machine harness.
- Check the continuity of the CAT data link circuit in the machine harness.
- Measure the resistance from contacts J1-10 and J1-20 of the transmission ECM. Measure the resistance to the corresponding contacts of each related electronic control module.
Expected Result:
The resistance measurement is less than 5 ohms.
Results:
- YES - The resistance measurement is less than 5 ohms.
Repair: The CAT data link circuit in the machine harness is correct. The ECM has failed. It is unlikely that the ECM has failed. Exit this procedure and perform this procedure for the diagnostic code again. Replace the ECM if the cause of the diagnostic code is NOT found. See Testing and Adjusting, "Electronic Control Module (ECM) - Replace".
STOP
- NO - The resistance is greater than 5 ohms.
Repair: The machine harness has failed. The CAT data link circuit is open in the machine harness. Repair the machine harness or replace the machine harness.
STOP