P0633 SKIM SECRET KEY NOT ENTERED

When Monitored and Set Condition:

When Monitored: While the key is on.
Set Condition: The SKIM secret key was not calibrated into the ECM.

POSSIBLE CAUSES

• IMPROPER IGNITION KEY IS BEING USED
• SKIM DTC'S
• SKIM NOT CALIBRATED PROPERLY

DIAGNOSTIC PROCEDURE

1. With the DRBIII®, read SKIM DTCs. Are any SKIM DTCs present?
   Yes --> Repair all SKIM DTCs first. Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL).
   No --> Go To 2
2. Verify that the proper ignition key is in the ignition lock on the steering column. Are the proper keys being used?
   Yes --> Go To 3
   No --> Use the proper key for the vehicle. Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL).
3. Using the DRBIII®, recalibrate the ECM with the proper SKIM secret key. With the DRBIII®, erase DTCs. Cycle the ignition switch from on to off to on. With the DRBIII®, read DTCs. Did the DTC reset?
   Yes --> Test Complete.
   No --> Verify information is correct and replace ECM. Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL).