D6N Track-Type Tractor Caterpillar

Illustration 1	g01878217
Schematic of the Cat Datalink Circuit

A CID 0590 is associated with communication malfunctions between the Engine ECM and the machine ECM. An FMI 02 indicates the Engine ECM is receiving erratic, intermittent, or incorrect data from the machine ECM over the CAT Datalink.

Probable causes for the diagnostic are:

• Incorrect software or hardware Part Numbers.

• Poor electrical connections in the machine harness.

• CAT Datalink circuit short to ground.

• CAT Datalink circuit short to +Battery.

• CAT Datalink circuit open.

Note: Poor connections often cause problems in electrical circuits. Before performing this procedure, inspect all of the harness connectors involved in the circuit. Verify that all circuit connections are clean, secure, and in good condition. If a problem is found with any of the connections: correct the problem, and verify that diagnostic code CID 0590 FMI 02 is still active, before performing the following procedures.

Note: Check for other data communications-related diagnostic codes first. If any are found, repair those codes first, prior to continuing with this procedure.

Note: The following test procedure may create other diagnostic codes. Ignore these created diagnostic codes now, but clear those codes after the original diagnostic code has been corrected.

System Response:

This failure results in events logged against an ECM that cannot be explained. The Engine ECM cannot communicate, or communicates intermittently, with the machine ECM.

Test Step 1. VERIFY THE HARDWARE AND SOFTWARE PART NUMBERS.

1. Verify that the following information is correct:
   • Machine ECM software part number.

   • Engine ECM software part number.

   • Machine ECM part number.

   • Engine ECM part number.

   Note: Consult the Business Unit that produces the product for the correct part numbers of the configuration software.

Expected Result:

All part numbers are correct.

Results:

• YES - All part numbers are correct. Go to test step 2.

• NO - All part numbers are not correct.

  Repair: Replace the incorrect ECM with an ECM that has the correct part number, or "Flash" the incorrect software with the correct software. See Troubleshooting, "Electronic Control Module (ECM) - Flash Program".

  Verify that CID 0588 FMI 02 is no longer active, and return the machine to normal operations. If CID 0588 FMI 02 is still active, go to Test Step 2.

Test Step 2. CHECK FOR ADDITIONAL RELATED DIAGNOSTIC CODES.

1. Ensure that all electronic control modules that use the Cat Datalink are connected.

2. Turn the disconnect switch and the key start switch to the ON position.

3. Acknowledge any active diagnostic codes that are currently displayed on the message center.

4. Verify that no other related, and active, diagnostic codes are present.

Expected Result:

No other related, and active, diagnostic codes are present.

Results:

• YES - No other related active diagnostic codes are present, but CID 0590 FMI 02 is still active. Go to Test Step 4.

• NO - Other related active diagnostic codes are present, and CID 0590 FMI 02 is still active. Go to Test Step 3.

Test Step 3. CLEAR ALL ACTIVE RELATED DIAGNOSTIC CODES.

1. Perform all required Test Procedures to clear all other related, active diagnostic codes.

Expected Result:

All related active diagnostic codes are cleared, and CID 0590 FMI 02 is no longer active.

Results:

• YES - All other related active diagnostic codes are cleared, and CID 0590 FMI 02 is no longer active.

  Repair: The diagnostic codes do not exist at this time. Return the machine to normal operations.

  STOP

• NO - All other related active diagnostic codes are cleared, but CID 0590 FMI 02 is still active. Go to Test Step 4.

Test Step 4. INSPECT THE HARNESS CONNECTIONS.

1. Turn the disconnect switch to the OFF position.

2. Disconnect and inspect all machine harness connectors related to the CAT Datalink. Make sure that the connectors are clean and tight.

3. Check the connectors for proper mating.

4. Check the wires at the connector.

5. Check each wire for nicks or signs of abrasion in the insulation.

6. Check for moisture at the connector.

7. Check the connectors for dirty contacts or corroded contacts.

8. Check each pin and each socket of the machine harness connectors.

Expected Result:

The machine harness connectors are tight and free of corrosion.

Results:

• YES - The machine harness connectors are tight and free of corrosion. Go to Test Step 5.

• NO - The machine harness connectors are in need of repair.

  Repair: Repair or replace the harness.

  Go to Test Step 7.

Test Step 5. CHECK FOR OPEN CIRCUITS IN THE HARNESS.

1. The disconnect switch remains in the OFF position.

2. The machine harness connectors all remain disconnected from the related ECM modules.

3. Check the continuity of the CAT Datalink circuit in the machine harness:
   • At the Engine ECM J1 harness connector, insert a jumper wire from connector contact J1-23 (wire 893-GN) to connector contact J1-24 (wire 892-BR).

   • At the machine ECM J1 harness connector, measure resistance from connector contact J1-10 (wire 893-GN) to connector contact J1-20 (wire 892-BR).

Expected Result:

Resistance is less than 5 ohms.

Results:

• YES - Resistance is less than 5 ohms. The CAT Datalink circuit in the machine harness is correct. Go to Test Step 6.

• NO - Resistance measured more than 5 ohms. The machine harness has failed.

  Repair: The CAT Datalink circuit is open in the machine harness. Repair or replace the harness.

  Go to Test Step 7.

Test Step 6. CHECK FOR SHORT CIRCUITS IN THE HARNESS.

1. The disconnect switch remains in the OFF position.

2. All related electronic control modules remain disconnected from the machine harness.

3. Remove the jumper wire from the machine ECM J2 harness connector

4. At the machine ECM J1 harness connector:
   • Measure resistance from contact J1-10 (wire 893-GN) to all the connector contacts used in the ECM J1 harness connector.

   • Measure resistance from connector contact J1-20 (wire 892-BR) to all the connector contacts used in the ECM J1 harness connector.

Expected Result:

Each resistance is more than 5000 ohms.

Results:

• YES - The CAT Datalink circuit in the machine harness is correct. Go to Test Step 7.

• NO - A resistance is less than 5000 ohms. The machine harness has failed.

  Repair: There is a short between the CAT Datalink circuit and the wire with the low resistance in the harness. Repair or replace the harness.

  Go to Test Step 7.

Test Step 7. CHECK IF THE DIAGNOSTIC CODE REMAINS.

1. Reconnect all harness connectors. Make sure that the connectors are clean and fully seated. Observe that the clips on each connector are securely fastened.

2. Turn the disconnect switch and the key start switch to the ON position.

3. Operate the machine.

4. Clear all inactive diagnostic codes.

5. Check the status of the CID 0590 FMI 02 diagnostic code.

Expected Result:

The diagnostic code is no longer active.

Results:

• YES - The diagnostic code is no longer active and does not exist at this time. Return machine to normal operationSTOP

• NO - The diagnostic code is still active. The cause for the code has not been corrected.

  Repair: If you have not inspected the harness connectors in a previous Test Step, do that now. Clean the contacts of the harness connectors. 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 sensor circuit.Perform a "wiggle test" on the sensor circuit of the machine wiring harness, using the Caterpillar Electronic Technician service tool. The "wiggle test" can be used to detect open or shorted connections in the machine wiring harness.Reconnect all harness connectors. Make sure that the connectors are fully seated. Observe that the clips for each connector are securely fastened. Perform Test Step 7 again. If the problem has NOT been found, and the original code is still active, the Scraper Transmission ECM may have failed.Prior to replacing an ECM, always contact your Dealership Technical Communicator for possible consultation with Caterpillar, or with the Dealer Solutions Network. This consultation may greatly reduce repair time. If the ECM needs to be replaced, see Testing and Adjusting, "Electronic Control Module (ECM) - Replace".

  STOP