CX28 Transmission For Combat and Tactical Vehicles Transmission ; Transfer Case Electronic Control System Caterpillar

Illustration 1	g01350167

This diagnostic code is associated with the data for the engine torque. The illustration for the J1939 Data Link may not represent all of the connections for the components that are on machines that are covered by this manual. Refer to the electrical system schematic for your machine in order to verify the J1939 Data Link connections.

Note: This diagnostic code is recorded when the Transmission ECU does not receive expected information about the data for the engine torque for a period of more than five seconds.

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

1. Verify that the following information is correct:
   • The part number of the flash software for the Transmission ECU

   • The part number of the Transmission ECU

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

Expected Result:

All the part numbers are correct.

Results:

• OK - All of the part numbers are correct. Proceed to Test Step 2.

• NOT OK - All of the part numbers are not correct.

  Repair: The ECU has the wrong part number or the incorrect software is installed. Replace the ECU with a module that has the correct part number. Flash the correct software. See the Testing and Adjusting, "Electronic Control Unit - Flash Program" section of this manual.

  STOP

Test Step 2. INSPECT THE HARNESS CONNECTIONS.

1. Turn the disconnect switch to the OFF position.

2. Inspect all harness connections that are related to the J1939 Data Link. Make sure that the connectors are clean and tight.

3. Check the connectors for proper mating. Ensure that all the seals are present and in place.

4. Check the harness for signs of damage or abrasion.

5. 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.

6. Check the exposed wires at the connectors for nicks or signs of abrasion.

7. Check for moisture inside the connector.

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

9. 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:

• OK - The machine harness connectors are tight and free of corrosion. Proceed to Test Step 3.

• NOT OK - 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 SHORTS TO GROUND

1. The disconnect switch remains in the OFF position.

2. Disconnect the machine harness from all electronic control modules that use the J1939 Data Link.

3. At the machine harness for the Transmission ECU, measure the resistance between contacts J2-67 and J2-68 of the J1939 Data Link and frame ground.

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 4.

• NOT OK - The resistance is less than 5000 Ohms. The machine harness has failed.

  Repair: There is a short between frame ground and the J1939 Data Link circuit in the machine harness. Repair the machine harness or replace the machine harness. See the Testing and Adjusting, "Wiring Harness (Short Circuit) - Test" section of this manual.

  STOP

Test Step 4. CHECK THE MACHINE HARNESS FOR A SHORT TO THE +BATTERY CIRCUIT.

1. The disconnect switch remains in the OFF position.

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

3. At the machine harness connector for the Transmission ECU, perform the checks that are listed here:
   • Measure the resistance between the connector contact J2-67 and all sources of +battery.

   • Measure the resistance between connector contact J2-68 and all sources of +battery.

Expected Result:

The resistance is greater than 5000 Ohms.

Results:

• OK - The harness circuit resistance is correct. Proceed to Test Step 5.

• NOT OK - The resistance is less than 5000 Ohms. The machine harness has failed.

  Repair: There is a short between the +battery circuit and the circuits of the J1939 Data Link circuit in the machine harness. Repair the machine harness or replace the machine harness. See the Testing and Adjusting, "Wiring Harness (Short Circuit) - Test" section of this manual.

  STOP

Test Step 5. CHECK IF THE DIAGNOSTIC TROUBLE CODE REMAINS.

1. Inspect the harness connectors. Clean the contacts of the harness connectors and check the wires for damage to the insulation that is caused by excessive heat, battery acid, or chafing.

2. Perform a 45 N (10 lb) pull test on each of the wires that are associated with the circuit.

3. Reconnect all harness connectors. Make sure that the harness connectors are fully seated and that the clips for each connector are completely fastened.

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

5. Operate the vehicle.

6. Check the status of the SPN 513 FMI 9.

Expected Result:

The SPN 513 FMI 9 is active.

Results:

• YES - The SPN 513 FMI 9 is active. The diagnostic trouble code has not been corrected.

  Repair: Check the circuit again. It is unlikely that the ECU has failed. Exit this procedure and perform this procedure again. If the cause of the diagnostic trouble code is not found, replace the ECU. Prior to replacing an ECU, always contact your dealership for possible consultation with Caterpillar. This consultation may greatly reduce repair time. See Testing and Adjusting, "Electronic Control Unit - Replace".

  STOP

• NO - The SPN 513 FMI 9 is not active. The diagnostic trouble code does not exist at this time. The initial diagnostic trouble code was probably caused by a poor electrical connection at one of the harness connectors that was disconnected and reconnected. Resume normal vehicle operation.STOP