How to Test J1939 Receive Communication Status for Caterpillar ECM

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J1939 Receive Communication Status Test function allows the current status of the J1939 communications received from the ECM to be diagnosed.

This is a test for J1939 messages that are expected to be received by the ECM. All other messages and data link traffic will not be included in this test. The data is updated approximately every five seconds.

Here is the illustration show you the steps on how to use CAT ET 2024A to perform J1939 receive communication status test for Caterpillar ECM.

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Accessing

Select “Diagnostic Tests” from the Diagnostics menu, and then select “J1939 Receive Communication Status” from the submenu. The J1939 Receive Communication Status screen is displayed.

 

Screen Layout

The J1939 Receive Communication Status screen has the following areas:

Instruction Area

The J1939 Receive Communication Status instruction area gives an explanation for the diagnostic test.

Display Area

The J1939 Receive Communication Status display area has two columns:

Description – Lists the J1939 devices in alphabetical order

State – Lists the status of the J1939 device. Possible states are:

Receiving – Displayed if the J1939 device has normal conditions and the messages are received by the ECM.

Not Receiving – Displayed if the J1939 device has sent messages to the ECM since powering up and is no longer sending required messages. This state indicates a possible problem.

Detected – Displayed if the J1939 device has sent one messages to the ECM at start up and no further message are required.

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