AP-1000D, AP-1055D, AP-655C, BG-2255C, BG-2455D and BG-260D Asphalt Pavers MID 030 - CID 0819 - FMI 02 Caterpillar

Conditions Which Generate This Code:

Illustration 1	g00928894
Schematic for a typical display power supply AP-655C

Illustration 2	g01112818
Schematic for a typical display power supply AP-1000D, AP-1055D

This diagnostic code is recorded when the main display module does not receive expected information. When the main display module sends information to a display component, the display component sends a signal back to the main display module. The signal confirms correct information. When the main display module does not receive expected information, the diagnostic code is logged. As a result of this diagnostic code, the main display module may not respond to the information that is received. Gauges and readouts could be incorrect when the main display module is in normal mode. Check the connections for the display data link. Check for opens or shorts in the harness wiring for the display data link.

Test Step 1. INSPECT THE HARNESS CONNECTIONS.

1. Turn the disconnect switch to the OFF position.

2. Inspect the harness connections that are related to the display data link. Make sure that the connectors are clean and tight.

3. Check the mating of the harness connectors.

4. Check 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 for dirty contacts or corroded contacts.

8. Check each pin and 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 2.

• NOT OK - The machine harness connectors are NOT tight and free of corrosion.

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

  Stop.

Test Step 2. CHECK FOR A SHORT TO +BATTERY

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

2. Disconnect the harness from the main display module.

3. Disconnect the machine harness connectors from all of the display components.

4. At the harness connectors for the main display module, measure the resistance between the contacts that are listed below:
   • Connector contact 1 (wire 108-BU) and the Display Data Link circuit contact 4 (wire C413-YL).

   • Connector contact 1 (wire 108-BU) and the Display Data Link circuit contact 5 (wire C414-BU).

   • Connector contact 1 (wire 108-BU) and the Display Data Link circuit contact 3 (wire E708-PK).

Expected Result:

The resistance is greater than 5000 ohms.

Results:

• OK - The resistance is greater than 5000 ohms. Proceed to test step 3.

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

  Repair: There is a short between the +battery and the circuits of the display data link in the machine harness. Replace the machine harness or repair the machine harness.

  Stop.

Test Step 3. CHECK FOR AN OPEN HARNESS.

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

2. All the display modules remain disconnected from the machine harness.

3. Measure the resistance of the circuits of the display data link that are listed below:
   • Measure the resistance between connector contact 35 (wire C413-YL) to connector contact 4 (wire C413-YL) of the message center module.

   • Measure the resistance between connector contact 15 (wire C414-BU) to connector contact 5 (wire C414-BU) of the message center module.

   • Measure the resistance between connector contact 25 (wire E708-PK) to connector contact 3 (wire E708-PK) of the message center module.

Expected Result:

The resistance is less than 5 ohms.

Results:

• OK - The resistance is less than 5 ohms. The circuit resistance is correct. Proceed to test step 4.

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

  Repair: There is an open in the machine harness. Repair the machine harness or Replace the machine harness.

  Stop.

Test Step 4. CHECK FOR A SHORT TO GROUND

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

2. The main display module and all the display components remain disconnected from the machine harness.

3. At the machine harness connector for the main display module, measure the resistance between frame ground and the connector contacts 35 (wire C413-YL), 15 (wire C414-BU) and 25 (wire E708-PK) of the display data link.

Expected Result:

The resistance is greater than 5000 ohms.

Results:

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

• NOT OK - The resistance is less than 5000 ohms. The resistance of the circuit is not correct.

  Repair: There is a short between frame ground and the circuits of the display data link in the machine harness. Replace the machine harness or repair the machine harness.

  Stop.

Test Step 5. CHECK FOR + 9 DCV

1. Reconnect all modules to the machine harness.

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

3. Use the 7X-1710 Cable probes to check the voltage at the contact 1 (wire E707-GN) to contact 2 (wire 200-BK) of the message center module.

Expected Result:

The voltage is 9.0 ± 0.5 DCV.

Results:

• OK - The voltage is 9.0 ± 0.5 DCV.

  Repair: Replace the message center module.

  Stop.

• NOT OK - The voltage is NOT 9.0 ± 0.5 DCV. The voltage is not correct.

  Repair: The main display module has failed. It is unlikely that the main display module has failed. Exit this procedure and perform this procedure again. If the problem is not found, replace the main display module. See Troubleshooting, "Main Display Module - Replace".

  Stop.