HOUSING-AFTERCOOLER 7E2382 - Caterpillar

failure is recorded when the VIMS main module does not receive expected information. For example, engine speed or actual gear information is not received from other electronic control modules through the CAT data link. This failure can result in the display of abnormal values on readouts that are dependent on the CAT data link information. The possible causes are listed here:
Poor electrical connection at a machine harness connector
CAT data link circuit in the machine harness is shorted to ground.
CAT data link circuit in the machine harness is shorted to the +battery.
CAT data link circuit in the machine harness is shorted.
CAT data link circuit in the machine harness is open.
An electronic control module which uses the CAT data link has failed. ("For example, the engine ECM, the transmission ECM, etc."). This is unlikely.
CHECK FOR ADDITIONAL DIAGNOSTIC CODES
Check for additional CID 0248 diagnostic codes that are logged against the other electronic control modules. This confirms the existence of a communication problem.
Check for a harness problem between the two controls that are reporting the CID 0248. Otherwise, Proceed to Step 2.
INSPECT THE HARNESS CONNECTORS.
Turn the disconnect switch to the OFF position.
Inspect the connections of the machine harness that are related to the CAT data link. Verify that the connectors are clean and tight.Expected Results The machine harness connectors are clean and tight.Results
OK Connectors of the machine harness are clean and tight. Proceed to Step 3.
NOT OK Machine harness connectors are in need of repair. Repair the harness or replace the harness. STOP.
CHECK FOR SHORT TO GROUND
The disconnect switch remains in the OFF position.
Disconnect the machine harness from all electronic control modules that use the CAT data link.
At the connector of the machine harness for the main module, measure the resistance between frame ground and the circuits of the CAT data link (contacts 4, 5, 6 and 7).Expected Results The resistance is greater than 5000 ohms. Results
OK Resistance is greater than 5000 ohms. The harness circuit resistance is correct. Proceed to Step 5.
NOT OK