AP600D, AP655D, BG600D and BG655D Asphalt Pavers Caterpillar

Illustration 1	g01647158
Schematic of the Cat Data Link Circuit

This diagnostic code is recorded when the Implement (Screed) ECM receives information from the Master Machine Control ECM and the information is NOT correct.

The possible causes of this diagnostic code are listed:

• A problem with the data link harness

• The Master Machine Control ECM is not operational.

• The Master Machine Control ECM has not been programmed with the correct application software.

Note: Other related diagnostic codes may cause this diagnostic code. Check for other related diagnostic codes.

System Response:

The machine will default to AP655D NACD configuration until Product ID has been entered into the Machine Control ECM.

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

1. Verify whether the following part numbers are correct:
   • Software part number for the "Implement (Screed) ECM"

   • Software part number for the "Machine Control ECM"

Note: Consult the Business Unit that is producing the product for the correct configuration of the machine.

Expected Result:

All part numbers are correct.

Results:

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

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

  Repair: One of the following modules may have the wrong part number and/or the software configuration is NOT correct: the "Implement (Screen) ECM", the Machine Control ECM, the "LH Operator ECM" and the "RH Operator ECM". See Testing and Adjusting, "Electronic Control Module (ECM) - Flash Program".

  STOP

Test Step 2. INSPECT THE HARNESS CONNECTIONS.

1. Turn the key start switch and the disconnect switch to the OFF position.

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

3. Check the mating of the connector.

4. Check the wires at the connector.

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

6. Check for moisture at the connector.

7. Check for dirty contacts and/or corroded contacts.

8. Check each pin and check each socket.

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 - The machine harness connectors require repair.

  Repair: Repair the harness or replace the harness.

  STOP

Test Step 3. CHECK FOR ADDITIONAL RELATED DIAGNOSTIC CODES.

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

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

3. Acknowledge any active diagnostic codes and troubleshoot any active diagnostic codes that are currently displayed on the "Operator Display Screen".

4. Verify that NO related diagnostic codes are present.

Expected Result:

No other diagnostic codes are present.

Results:

• OK - No other diagnostic codes are present. Proceed to Test Step 4.

• NOT OK - Other related diagnostic codes are present.

  Repair: Exit this procedure and perform the other related diagnostic codes. Verify that the other related diagnostic codes are NOT present. Observe the status of CID 0967 FMI 02. If CID 0967 FMI 02 code remains active, perform CID 0967 FMI 02 again.

  STOP

Test Step 4. CHECK FOR SHORTS TO GROUND.

1. Turn the disconnect switch and the key start switch to the OFF position.

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

3. At the machine harness for the each individual ECM, measure the resistance between frame ground and the following data link circuits:
   • Contact J1-10 (wire 944-OR) and contact J1-20 (wire 945-BR) of the "Implement (Screed) ECM".

   • Contact 8 (wire 944-OR) and contact 9 (wire 945-BR) of the "Machine Control ECM".

   • Contact J1-10 (wire 944-OR) and contact J1-20 (wire 945-BR) of the "Machine ECM".

   • Contact J1-10 (wire 944-OR) and contact J1-20 (wire 945-BR) of the "LH Operator ECM".

   • Contact J1-10 (wire 944-OR) and contact J1-20 (wire 945-BR) of the "RH Operator ECM".

Expected Result:

Each resistance that is measured is greater than 5000 ohms.

Results:

• OK - Each resistance that is measured is greater than 5000 ohms. The harness circuit is correct. Proceed to Test Step 5.

• NOT OK - One or more resistance that is measured is NOT greater than 5000 ohms. The machine harness has failed.

  Repair: There is a short between frame ground and the data link circuit in the machine harness. Repair the machine harness or replace the machine harness.

  STOP

Test Step 5. CHECK FOR A SHORT TO THE +BATTERY.

1. The disconnect switch and the key start switch remain in the OFF position.

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

3. Measure the resistance between contact J1-31 (wire 140-RD) to contact J1-10 (wire 944-OR) and contact J1-20 (wire 945-BR) of the "Implement (Screed) ECM".

Expected Result:

The resistance that is measured is greater than 5000 ohms for each measurement.

Results:

• OK - The resistance that is measured is greater than 5000 ohms for each measurement. Proceed to Test Step 6.

• NOT OK - The resistance that is measured is NOT greater than 5000 ohms for each measurement. The machine harness has failed.

  Repair: There is a short between the +battery and the 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.

1. The disconnect switch and the key start switch remain in the OFF position.

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

3. Check the continuity of the data link circuit in the machine harness.

4. Perform the following measurements:
   • Measure the resistance from connector contact J1-10(wire 944-OR) of the "Implement (Screed) ECM" to the corresponding connector contacts:

   Show/hide table

   Table 1

   Module	Contact	Wire
   Machine ECM	J1-10	944-OR
   Operator Display	8	944-OR
   Engine	23	944-OR
   Machine Security System	12	944-OR
   Product Link	5	944-OR
   LH Operator ECM	J1-10	944-OR
   RH Operator ECM	J1-10	944-OR

   • Measure the resistance from connector J1-20 (wire 945-BR) of the "Implement (Screed) ECM" to the corresponding connector contacts:

   Show/hide table

   Table 2

   Module	Contact	Wire
   Machine ECM	J1-20	945-BR
   Operator Display	9	945-BR
   Engine	24	945-BR
   Machine Security System	11	945-BR
   Product Link	6	945-BR
   LH Operator ECM	J1-20	945-BR
   RH Operator ECM	J1-20	945-BR

Expected Result:

The resistance that is measured is less than 5 ohms for each measurement.

Results:

• OK - The resistance that is measured is less than 5 ohms for each measurement. The data link circuit is correct. The ECM may have failed.

  Repair: It is unlikely that the ECM has failed. Exit this procedure and perform this diagnostic code procedure again.Prior to replacing an ECM, always contact your dealership's "Technical Communicator" for possible consultation with Caterpillar. This consultation may greatly reduce repair time. If the cause of the diagnostic code is not found and the ECM must be replaced, refer to Testing and Adjusting, "Electronic Control Module (ECM) - Replace".

  STOP

• NOT OK - The resistance that is measured is greater than 5000 ohms for one or more of the measurements. The machine harness has failed.

  Repair: The data link circuit is open in the machine harness. Repair the machine harness or replace the machine harness. Verify that the repair eliminates the problem.

  STOP