RENR5042-02 119 Troubleshooting Section Test Step 2. Check For Diagnostic Codes A. Turn the keyswitch to the OFF position. B. Connect the Caterpillar Electronic Technician (ET) to the service tool connector. Refer to Troubleshooting, “Electronic Service Tools”. C. Turn the keyswitch to the ON position. D. Observe the “Active Diagnostic” screen on Cat ET. Wait at least 15 seconds so that any codes may become active. Look for these codes: 253-02 Personality Module mismatch 268-02 Check Programmable Parameters E. Verify that the engine’s configuration parameters are not scrambled. g01120020 Illustration 45 ECM Expected Result:
(1) J2/P2 connectors (2) J1/P1 connectors The 253-02 or 268-02 codes are not active. The configuration parameters are not scrambled. Results: B. Thoroughly inspect connectors (1) and (2). Inspect the battery connections. Refer to Troubleshooting, “Electrical Connectors - Inspect” for details. Active 253-02 code – A 253-02 diagnostic code is active. Proceed to Test Step 3. C. Check the allen head screw on each ECM connector for the proper torque. Refer to Troubleshooting, “Electrical Connectors - Inspect” for the correct torque values. Active 268-02 code – A 268-02 diagnostic code is active. Proceed to Test Step 4. D. Check the harnesses and the wiring for abrasion and for pinch points.
Scrambled parameters The configuration parameters are scrambled. Proceed to Test Step 5. Test Step 3. Check the Part Number of the Flash File Expected Result: All connectors, pins and sockets are completely coupled and/or inserted and the harnesses and wiring are free of corrosion, of abrasion or of pinch points. A. Turn the keyswitch to the ON position. B. Verify that the flash file agrees with the original engine arrangement. Results: Expected Result: OK The harnesses and the connectors appear to be OK. Proceed to Test Step 2. The correct flash file is installed in the ECM. Not OK – The wiring and/or a connector are not OK. Results: OK – The correct flash file is installed in the ECM.
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. Repair: The engine will not start until the 253-02 diagnostic code is cleared. Clearing this code requires factory passwords. Acquire factory passwords. Clear the 253-02 diagnostic code. Return the engine to service. Verify that the repair eliminates the problem. STOP. STOP.