AP600D, AP655D, BG600D and BG655D Asphalt Pavers Caterpillar

Illustration 1	g01521810
Machine ECM Location Code Schematic

This diagnostic code is recorded when the software location code for the Machine ECM does not match the hardware location codes.

Note: The Machine ECM is located inside the Center Console mounted to the access door.

The probable cause of this diagnostic code is software. The wrong software has been flashed into the ECM.

Note: Do not change the hard wired location code if you have flashed the incorrect software into the control.

Before performing this procedure, inspect the harness connectors that are involved in the circuit. Poor connections can often be the cause of a problem in an electrical circuit. Verify that all connections in the circuit are clean, secure and in good condition. If a problem with a connection is found, correct the problem and verify that this diagnostic code is active before performing this procedure.

System Response:

The machine is inoperable.

The following pop-up message shows on graphical display: "Machine will not function until the fault has been fixed."

Test Step 1. VERIFY HARDWARE AND SOFTWARE PART NUMBERS

1. Verify whether the part number of the software for the ECM is correct.

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 for the ECM. Proceed to test step 2.

• NOT OK - All part numbers are NOT correct. The installed ECM has the wrong part number or incorrect configuration software is installed.

  Repair: Replace the ECM with a module that has the correct part number or flash the correct configuration software. See Testing and Adjusting, "Electronic Control Module (ECM) - Flash Program".

  STOP

Test Step 2. VERIFY WHETHER THE LOCATION CODE MATCHES THE ET STATUS SCREEN.

1. Check the ET status screen in order to verify the location code .

Expected Result:

The location codes in the ET are correct.

Results:

• OK - The location codes in the ET are correct. Proceed to test step 3.

• NOT OK - The location codes are NOT correct.

  Repair: Repeat this test step in order to verify that the software and hardware part numbers are correct.

  Proceed to test step 3 if the part numbers are correct.

Test Step 3. INSPECT 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 location codes. Make sure that the connectors are clean. Make sure that the connectors are tight.

3. Check for the proper mating of the connector.

4. Check all wires at the connector.

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

6. Check for moisture at the connector.

7. Check for dirty contacts or corroded contacts.

8. Check each pin and check each socket.

Expected Result:

The machine harness connectors are tight and the machine harness connectors are free of corrosion.

Results:

• OK - The machine harness connectors are tight and the machine harness connectors are free from corrosion. Proceed to test step 4.

• NOT OK - One or more of the machine harness connectors are in need of repair.

  Repair: Repair the machine harness or replace the machine harness.

  STOP

Test Step 4. CHECK FOR SHORTS TO GROUND.

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

2. Disconnect the machine harness connector from the ECM.

3. At the machine harness for the ECM, measure the resistance between the frame ground and the location code pins.
   Show/hide table

   Table 1

   Location Codes for the Machine ECM (MID 039)
   Hardware Location Code	Pin Status	Pin Number
   Keyed Input 1	Ground	J1-26
   Keyed Input 2	Open	J1-27
   Keyed Input 3	Open	J1-28
   Keyed Input 4	Ground	J1-32

Expected Result:

The resistance that is measured is greater than 5 ohms at contacts J1-27, and J1-28. The resistance measures less than 5 ohms at contacts J1-26 and J1-32.

Results:

• OK - The resistance that is measured is greater than 5 ohms at contacts J1-27, and J1-28. The resistance measures less than 5 ohms at contacts J1-26 and J1-32. The harness circuit is correct. Proceed to test step 5.

• NOT OK - One or more of the resistance measurements is NOT correct. The machine harness has failed.

  Repair: Repair the machine harness or replace the machine harness.

  STOP

Test Step 5. CHECK FOR SHORTS TO THE +BATTERY CIRCUIT.

1. The disconnect switch remains OFF.

2. The ECM remains disconnected from the machine harness connector.

3. At the machine harness connector for the ECM, measure the resistance between J1-26 and all possible sources of the +battery circuit.

4. At the machine harness connector for the ECM, measure the resistance between J1-32 and all possible sources of the +battery circuit.

Expected Result:

The resistances are greater than 5 ohms.

Results:

• OK - The resistances are greater than 5 ohms. The harness circuit is correct. Proceed to test step 6.

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

  Repair: Repair the machine harness or replace the machine harness.

  STOP

Test Step 6. CHECK FOR AN OPEN HARNESS.

1. The disconnect switch remains in the OFF position.

2. The ECM remains disconnected from the machine harness.

3. At the machine harness for the ECM, measure the resistance between the frame ground and J1-26.

4. At the machine harness for the ECM, measure the resistance between the frame ground and J1-32.

Expected Result:

Both resistances are less than 5 ohms.

Results:

• OK - The resistances are less than 5 ohms. The location code circuit is correct. The ECM may have failed.

  Repair: Check the circuit again.If the cause of the problem is not found, contact the Technical Communicator for your dealership for possible consultation with Caterpillar. This consultation may greatly reduce repair time. If the ECM requires replacement, see Troubleshooting, "Electronic Control Module (ECM) - Replace".

  STOP

• NOT OK - One or both resistances is greater than 5 ohms. The machine harness has failed.

  Repair: Repair the machine harness or replace the machine harness.

  STOP