GASKET 8J0499 - Caterpillar

System Operation Description:The Electronic Control Module (ECM) is the computer that controls the Caterpillar engine. The personality module contains the software that controls the operation of the computer (ECM).The personality module software is the instructions that are used by the ECM to control the engine. For this reason, updating the personality module to a different version may affect some engine functions.This procedure covers the following diagnostic codes:
253-02 Personality Module mismatch
254-12 Electronic Control Module Error
268-02 Check Programmable ParametersAlso, use this procedure to troubleshoot the following conditions:
The integrity of the customer parameters or the system parameters in the ECM is questionable.
The data for the engine lifetime totals is questionable.
The connection of any electrical equipment and the disconnection of any electrical equipment may cause an explosion hazard which may result in injury or death. Do not connect any electrical equipment or disconnect any electrical equipment in an explosive atmosphere.
Test Step 1. Check for an Active 254-12 Diagnostic Code
Turn the keyswitch to the OFF position.
Connect Caterpillar Electronic Technician (ET) to the service tool connector. Check for an active 254-12 diagnostic code.Expected Result:The 254-12 code is not active.Results:
Not active - A 254-12 code is not active. Proceed to Test Step 2.
Active - A 254-12 code is active.Repair: Replace the ECM. Refer to Troubleshooting, "Replacing the ECM". Verify that the problem is resolved.STOPTest Step 2. Inspect the Electrical Connectors and the Wiring
Turn the keyswitch to the OFF position.
Illustration 1 g01120020
ECM (1) J2/P2 connectors (2) J1/P1 connectors
Thoroughly inspect connectors (1) and (2). Inspect the battery connections. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
Check the allen head screw on the ECM connectors for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for the correct torque value.
Check the harnesses and the wiring for abrasion and for pinch points.Expected Result:All connectors, pins and sockets are completely coupled and/or inserted and the harnesses and wiring are free of corrosion, of abrasion, and of pinch points.Results:
OK - The harnesses and the connectors appear to be OK. Proceed to Test Step 3.
Not OK - The wiring and/or a connector are not OK.Repair: Repair the wiring and/or the connectors. Replace parts, if necessary. Ensure that all of the seals are properly in place and ensure that the connectors are completely coupled. Verify that the repair eliminates the problem.STOPTest Step 3. Check for Diagnostic Codes
Turn the keyswitch to the ON position.
Use