627G and 637G Wheel Tractor-Scrapers Power Train Electronic Control System Caterpillar

This diagnostic code is recorded when the power train ECM receives information about the harness code from the monitoring system. This information indicates that the serial number for the machine has changed during machine operation. The information that was received is NOT correct.

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

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 scraper's power train ECM

   • Software part number for the monitoring system

Expected Result:

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

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 modules that are listed above may have the wrong part number and/or the software configuration is NOT correct. 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 the connectors are free of corrosion. Proceed to test step 3.

• NOT OK - 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 that are currently displayed on the message center.

4. Verify that NO related diagnostic codes are present.

Expected Result:

NO other diagnostic codes are present.

Results:

• OK - NO other related 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 the CID 0967 FMI 09. If the CID 0967 FMI 09 remains active, perform CID 0967 FMI 09 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, measure the resistance between frame ground and the following data link circuits:
   • Contact J1-3 (wire 892-BR) and contact J1-9 (wire 893-GN) of the engine ECM

   • Contact J1-3 (wire 892-BR) and contact J1-9 (wire 893-GN) of the tractor's power train ECM.

   • Contact J1-3 (wire 892-BR) and contact J1-9 (wire 893-GN) of the scraper's power train ECM

   • Contact J1-7 (wire 892-BR) and contact J1-8 (wire 893-GN) of the machine control ECM

   • Contact 14 (wire 892-BR) and contact 5 (wire 893-GN) of the tractor's Caterpillar Monitoring System.

   • Contact 14 (wire 892-BR) and contact 5 (wire 893-GN) of the scraper's Caterpillar Monitoring System

Expected Result:

The resistance is greater than 5000 ohms.

Results:

• OK - The resistance is greater than 5000 ohms. The harness circuit is correct. Proceed to test step 5.

• NOT OK - The resistance 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 CIRCUIT.

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 J1-1 (wire 128-PK) to contact J1-3 (wire 892-BR) and contact J1-9 (wire 893-GN).

Expected Result:

The resistance is greater than 5000 ohms.

Results:

• OK - The resistance is greater than 5000 ohms. proceed to test step 6.

• NOT OK - The resistance is less than 5000 ohms. The machine harness has failed. There is a short between the +battery circuit and the circuits of the CAT data link in the machine harness.

  Repair: 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.
   • Measure the resistance from connector contact J1-3 (wire 892-BR) of the scraper's power train ECM to the corresponding connector contacts:

   Show/hide table

   Table 1

   Module	Contact	Wire
   Engine ECM	J1-3	892-BR
   Tractor's Power Train ECM	J1-3	892-BR
   Tractor's Caterpillar Monitoring System	14	892-BR
   Scraper's Caterpillar Monitoring System	14	892-BR
   Machine Control ECM	J1-7	892-BR

   • Measure the resistance from connector J1-9 (wire 893-GN) of the chassis ECM to the corresponding connector contacts:

   Show/hide table

   Table 2

   Module	Contact	Wire
   Engine ECM	J1-9	893-GN
   Tractor's Power Train ECM	J1-9	893-GN
   Tractor's Caterpillar Monitoring System	14	892-BR
   Scraper's Caterpillar Monitoring System	14	892-BR
   Machine Control ECM	J1-8	893-GN

Expected Result:

The resistance measures less than 5 ohms.

Results:

• OK - The resistance measures less than 5 ohms.

  Repair: The CAT data link circuit is correct. It is unlikely that the ECM has failed. Exit this procedure and perform this diagnostic code again. Replace the chassis ECM if the cause of the diagnostic code is not found. See Testing And Adjusting, "Electronic Control Module (ECM) - Replace".

  Stop.

• NOT OK - The resistance is greater than 5 ohms. 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.