3500B Engines for Caterpillar Built Power Modules with the ADEM 2 Electronic Control Module Caterpillar

The CAT Data Link is used for communication between electronic modules. The CAT Data Link is used to communicate information from the ECM to the Caterpillar Monitoring System. The CAT Data Link is used for programming and troubleshooting the ECM.

The ECM communicates with the Caterpillar Monitoring System in order to share engine information and electronic system diagnostics.

The ECM communicates with the ET in order to share status and diagnostic information. The ET can also be used to configure the ECM parameters on the engine. This information will not be available if communications fail between the ECM and the ET.

The 3500B engine can be FLASH downloaded over the CAT Data Link.

Illustration 1	g00629913

Test Step 1. Check for Connector Damage.

1. Turn the circuit breaker for the battery to the OFF position.

2. Turn the ECS to the OFF/RESET position.

3. Check the connectors and wiring for the following problems: damage, corrosion, abrasion and incorrect attachment.

Expected Result:

The connectors and wiring should be free of the following problems: damage, corrosion, abrasion and incorrect attachment.

Results:

• OK - Proceed to test step 2.

• Not OK -

  Repair: Repair the connector and/or wiring or replace the connector and/or wiring.

  Stop.

Test Step 2. Check the CAT Data Link.

1. Turn the ECS to the OFF/RESET position.

2. Connect the ET.

3. Turn the circuit breaker for the battery to the ON position.

4. Turn the ECS to the STOP position.

5. Check for any LOGGED diagnostic codes.

6. Start the engine and read the Status Information on the ET.

7. Observe the engine oil pressure and the coolant temperature on the Caterpillar Monitoring System.

   Note: If some of the parameters, but not all of the parameters were displayed, the CAT Data Link is OK. Check the component that is associated with any missing parameter.

Expected Result:

The ET should display the Status Information. The Caterpillar Monitoring System should display engine parameters.

Results:

• OK - The CAT Data Link is operating correctly at this time. Stop.

• No Parameter Displayed - There is a problem with the CAT Data Link. Proceed to test step 3.

• Service Tool Did Not Power ON - The ET or the Communication Adapter did not power up. Proceed to test step 4.

Test Step 3. Check Communication With the ET and the Communication Adapter.

1. Turn the ECS to the OFF/RESET position.

2. Reconnect ECM connectors J1/P1 and J2/P2.

3. Disconnect J3C/P3C.

4. Connect the ET.

5. Turn the ECS to the STOP position.

6. Read LOGGED Diagnostics and Status Information on the ET.

Expected Result:

Status Information appears on the ET.

Results:

• OK - Proceed to test step 5.

• Not OK - Proceed to test step 6.

Test Step 4. Check Battery Voltage.

1. Turn the ECS to the OFF/RESET position.

2. Ensure that all connectors are connected.

3. Turn the ECS to the STOP position.

4. Measure the voltage between pin A and pin B at J60.

Expected Result:

The voltage should be 20 to 28 VDC.

Results:

• OK - The voltage is OK. Proceed to test step G.

• Not OK - There is a problem in the harness or electrical power supply.

  Repair: Repair the connector and/or wiring or replace the connector and/or wiring.

  Stop.

Test Step 5. Check For Shorts in the Harness

1. Turn the ECS to the OFF/RESET position.

2. Disconnect the ECM connectors J1/P1 and J2/P2. Disconnect the service tool connector J60/P60. Disconnect the Caterpillar Monitoring System.

3. Ensure that the connector J3A/P3A is connected.

4. Measure resistance from P1-3 to P1-9.

5. Check the resistance at the following points:
   • P1-3 to P1-5

   • P1-9 to P1-5

   • P1-3 to P1-6

   • P1-3 to P1-4

   • P1-9 to P1-4

   • P1-3 to P1-11

   • P1-9 to P1-11

6. Measure the resistance from P99-5 to P99-14.

Expected Result:

Resistance should read more than 20,000 Ohms for each measurement.

Results:

• OK - The resistance is greater than 20,000 Ohms. The harness is free of shorts. Proceed to test step 7.

• Not OK - The resistance is less than 20,000 Ohms.

  Repair: Repair the connectors and/or wiring or replace the connectors and/or wiring.

  Stop.

Test Step 6. Check the Operation of the ET.

Verify proper operation of the ET on another engine.

Expected Result:

Results:

• OK - Proceed to test step 5.

• Not OK - The ET and the Communications Adapter did not work on another engine. There is a problem with the ET, cables, or the Communication Adapter.

  Repair: Repair the connectors and/or wiring or replace the connectors and/or wiring.

  Stop.

Test Step 7. Check the Resistance Through the Harness.

1. Turn the ECS to the OFF/RESET position.

2. Disconnect the ECM connectors J1/P1 and J2/P2. Disconnect the service tool connector J60/P60 and the monitoring system J99/P99.

3. Ensure that the customer connector J3A/P3A is connected.

4. Use a suitable piece of wire to short P1-9 to P1-3.

5. Measure the resistance between P99-14 to P99-5.

6. Measure the resistance between pin D and pin E of the Service Tool Connector J60.

Expected Result:

Resistance should read less than 10 Ohms through the wires.

Results:

• OK - Resistance is less than 10 Ohms through the harness and connectors. Proceed to test step 8.

• Not OK - There is an open circuit in the harness or connectors.

  Repair: Repair the connectors and/or wiring or replace the connectors and/or wiring.

  Stop.

Test Step 8. Check Isolated Communication.

1. Turn the ECS to the OFF/RESET position.

2. Reconnect the ECM connectors and the Customer Connector.

3. Disconnect J99/P99. Disconnect the customer connector J3/P3.

4. Install the ET.

5. Turn the ECS to the STOP position.

6. Read LOGGED Diagnostics.

7. Turn the ECS to the START position.

8. Read the Status information.

Expected Result:

The ET should display any Diagnostics and Status Information.

Results:

• OK - Proceed to test step 9.

• Not OK - Verify proper operation of the ET and Communication Adapter on another engine. Proceed to test step 10.

Test Step 9. Verify the CAT Data Link.

1. Turn the ECS to the OFF/RESET position.

2. Reconnect all of the connectors.

3. Turn the ECS to the STOP position.

4. Observe the parameters on the Monitoring System.

   Note: The CAT Data Link is operating correctly at this time. If some of the parameters, but not all of the parameters were displayed, the CAT Data Link is OK. Check the component that is associated with any missing parameter.

   Note: The Monitoring System can display a message that indicates a fault with the ECM. The message may not indicate that the ECM is faulty. The message is displayed when the system no longer receives any engine related parameters.

Expected Result:

The parameters should appear on the Caterpillar Monitoring System.

Results:

• OK - Stop.

• Not OK -

  Repair: There is a problem with the Caterpillar Monitoring System and/or the data link cable. Check that the cable is not too long. Refer to Service Manual, SENR6587.

  Stop.

Test Step 10. Perform the following test: Electrical Power Supply

Results:

• REPAIRED, OK - Stop.

• OK - Stop.