| Parameters for Data Link Broadcast | |||||
|---|---|---|---|---|---|
| Parameter | PGN | Bytes | Resolution (Offset) |
Byte Order in Message | Transmission Rate |
| Percent Load | 61443 | 1 | 1%/bit (0%) |
3 | 50 ms |
| Oil Pressure | 65263 | 1 | 4 kPa/bit (0 kPa) |
4 | 500 ms |
| Battery Voltage | 65271 | 2 | 0.05 V/bit (0 V) |
5, 6 | 1.0 s |
| Boost Pressure | 65270 | 1 | 2 kPa/bit (0 kPa) |
2 | 500 ms |
| Coolant Temperature | 65262 | 1 | 1 °C/bit (-40 °C) |
1 | 1.0 s |
| Fuel Pressure | 65263 | 1 | 4 kPa/bit (0 kPa) |
1 | 500 ms |
| Fuel Temperature | 65262 | 1 | 1 °C/bit (-40 °C) |
2 | 1.0 s |
| Fuel Rate | 65266 | 2 | 0.05L/hr/bit (0Lhr) |
1, 2 | 100 ms |
| Engine Speed | 61444 | 2 | 0.125 rpm/bit (0 rpm) |
4, 5 | 15 ms |
| Inlet Manifold Temperature | 65270 | 1 | 1 °C/bit (-40 °C) |
3 | 500 ms |
| Engine Hours | 65253 | 4 | 0.05 hr/bit (0 hr) |
1, 2, 3, 4 | 50 ms |
| Desired Engine Speed | 65247 | 2 | 0.125 rpm/bit (0 rpm) |
2, 3 | 250 ms |
| Auxiliary Temperature | 65164 | 1 | 1 °C/bit (-40 °C) |
1 | 1.0 s |
| Auxiliary Pressure | 65164 | 1 | 16 kPa/bit (0 kPa) |
3 | 1.0 s |
| Direct Speed Control | 00000 | 2 | 0.125 rpm/bit (0 rpm) |
2, 3 | 10 to 50 ms |
The CAN Data Link is used to communicate information from the ECM in order to share engine information and diagnostics for the electronic system.
 | |
| Illustration 1 | g00855398 |
Schematic for the CAN Data Link | |
 | |
| Illustration 2 | g00894367 |
P1 ECM connector | |
Test Step 1. Inspect Electrical Connectors and Wiring
- Turn the keyswitch to the OFF/RESET position.
- Check the connectors and wiring for the following problems: damage, corrosion, abrasion and incorrect attachment. Pay close attention to the following areas:
- J1/P1 ECM connector
- J3/P3 Customer connector
- Connectors for the J1939 Data Link
- Engine wiring harness from the ECM to the customer connector
Refer to Troubleshooting, "Electrical Connectors - Inspect" for more information.
- J1/P1 ECM connector
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 J1939 Data Link circuit. Verify that the repair eliminates the problem.
Stop.
Test Step 2. Verify that Termination Resistors are Installed on the Ends of the Data Link
- Disconnect P1 from the ECM.
- Disconnect the J1939 Displays from the harness.
- Measure the resistance between P1:10 and P1:16 of the P1 ECM connector.
Expected Result:
The resistance should be 60 ohms ± 5%.
Results:
- OK - Proceed to Test Step 3.
- Not OK -
Repair: The resistance equals 120 ohms ± 5%. A terminating resistor is missing. Refer to Illustration 1 and install the missing terminating resistor.
Stop.
- Not OK - Resistance is less than 50 ohms. Proceed to Test Step 3.
- Not OK - Resistance is greater than 130 ohms. Proceed to Test Step 4.
Test Step 3. Verification of Number of Terminating Resistors
A terminating resistor should be installed at each end of the J1939 data link. Refer to Illustration 1 for the proper location.
Expected Result:
The J1939 Data Link circuit should contain two terminating resistors.
Results:
- OK - Proceed to Test Step 4.
- Not OK - Make the necessary changes in the circuit for the J1939 Data Link in order to ensure that the two terminating resistors are in the proper locations. Stop.
Test Step 4. Check for a Short in the CAN Data Link
- Disconnect P1 from the ECM.
- Disconnect the J1939 display modules.
- Remove the terminating resistors.
- Measure the resistance between the following pins.
- P1:10 and P1:16
- P1:10 and P1:15
- P1:15 and P1:16
- P1:10 and P1:16
Expected Result:
The resistance should be greater than 20,000 ohms.
Results:
- OK - There are no shorts in the wiring harness. Proceed to Test Step 5.
- Not OK -
Repair: There is a short in the harness. Make the necessary repairs. Verify that the repair eliminates the problem.
Stop.
Test Step 5. Check for an Open Circuit at the J1939 Display
- Allow the components to remain disconnected.
- Make a short jumper with sockets.
- Install one end of the jumper on pin A of the J1939 Display connector.
- Install the other end of the jumper to pin B of the J1939 Display connector.
- Measure the resistance between P1:10 and P1:16.
Expected Result:
The resistance should be less than 10 ohms.
Results:
- OK - Proceed to Test Step 6.
- Not OK -
Repair: There is an open circuit in the harness. Make the necessary repairs. Verify that the repair eliminates the problem.
Stop.
Test Step 6. Check the J1939 Display
- Reconnect the P1 ECM connector.
- Remove the J1939 Display and take the display to the ECM.
- Disconnect the harness that is connected to the T for the ECM.
- Connect one end of a 165-0201 Cable to the T for the ECM.
- Connect the other end of the cable to the J1939 Display.
- Turn the keyswitch ON.
Expected Result:
The J1939 Display should operate properly.
Results:
- OK -
Repair: There is a problem in the wiring between the ECM and the J1939 Display. Make the necessary repairs. Verify that the repair eliminates the problem.
Stop.
- Not OK -
Repair: There is an error in the Data Link with the J1939 Display. Connect the display to another engine. If the display operates properly, replace the ECM. If the display does not operate properly, replace the J1939 Display.
Stop.