HARNESS AS-ENGINE 4747537 - Caterpillar

Illustration 1 g00589030
Personality ModuleNote: The Engine Control Switch (ECS) is mounted within an instrument panel that is located on the right side of the engine. The ECS is locked into the AUTO position with a pin. The pin must be removed in order to perform this test. After performing this test, ensure that the ECS is placed in the AUTO position and that the locking pin has been reinstalled.Test Step 1. Check for "ACTIVE" Codes.
Turn the ECS to the OFF/RESET position.
Connect the Cat ET.
Turn the ECS to the ON position. The engine should be off.
Check for active diagnostic codes.Results:
253-02 Present - Proceed to test step 2.
254-12 Present - If an internal problem develops, the diagnostic code 254-12 becomes active. This indicates that the ECM has detected an internal problem that cannot be fixed.Repair: Replace the ECM. Ensure that the new ECM serial number ends in CD. Refer to the diagnostic procedure Troubleshooting, "Replacing the ECM" before replacing the ECM. Stop.
268-02 Present - Repair: Reprogram the system configuration parameters. Refer to the diagnostic procedure Troubleshooting, "System Configuration Parameters" for additional information. Stop.Test Step 2. Check for a Personality Module Mismatch.
Verify that the correct ECM has been installed.
Check the ECM part number. Check the last two characters of the ECM serial number.Expected Result:The ECM serial number should end with a CD.Results:
OK - The serial number of the ECM ends with a CD. Verify that the correct Personality Module is installed.Repair: Connect the Cat ET and reprogram the interlock code. Stop.
Not OK - The serial number of the ECM does not end in a CD.Repair: Replace the ECM. Ensure that the new ECM serial number ends in CD. Refer to the diagnostic procedure Troubleshooting, "Replacing the ECM" before replacing the ECM. Stop.