Test Step 3. Use the Special Test on an Electronic Service Tool to Check the Devices on the J1939 Data Link

342

TM 9-2320-312-24-2

Troubleshooting Section

F. The status screen on the electronic service tool

Expected Result:

can be set to display the status of a device that

is not working. The status screen will display "No

One of the following diagnostic codes is active:

Comm" if a message is not received from the

231-11 J1939 Data Link Fault (58)

device.

Note: The "Powertrain Data Link" parameter is a

Expected Result:

customer parameter that must not be programmed

The electronic service tool displays the devices that

to "J1939", unless the J1939 Data Link is being

are used on the vehicle and the ECM is receiving

used. If J1939 is not connected and the parameter

messages from the devices.

is programmed for J1939 the following active

diagnostic code will occur:

Results:

231-11 J1939 Data Link Fault (58)

Yes The ECM is receiving messages from the

devices that are installed on the vehicle. STOP.

Results:

Yes 231-11 Active Proceed to Test Step 3.

No The ECM is not receiving messages from

the devices that are installed on the vehicle.

No Proceed to Test Step 4.

Repair: The devices that can be programmed

Test Step 3. Use the Special Test on an

to use the J1939 data link can be circuits

Electronic Service Tool to Check the

with two wires or circuits with three wires. Bad

Devices on the J1939 Data Link.

connections are the most frequent problem.

Repair the connectors or wiring and/or replace the

connectors or wiring. Ensure that the connectors

A. Connect the electronic service tool to the cab

are free of corrosion.

data link connector.

STOP.

B. Access the special test "J1939 Receive

Communication Status". The special tests are

located under the Diagnostic menu.

C. The electronic service tool will display the J1939

sources that have transmitted at least one good

message that has been successfully received

by the ECM. If the ECM has not received any

messages from a source, that source will not be

displayed. Examples of devices that can use the

J1939 data link include the following switches:

Switches that are programmed to "Instrument

Cluster"

Switches that are programmed to "Body

Controller"

Switches that are programmed to "Cab

Controller"

D. The electronic service tool will display the J1939

source in the "Description" column. The "Status"

column displays the status of the device.

E. If a message is not received from a device,

the electronic service tool will display "Not

Receiving".