Chevrolet Workshop Service and Repair Manuals > TrailBlazer 4WD L6-4.2L VIN S (2002) > Powertrain Management | Ignition System | Crankshaft Position Sensor | Component Information | Service and Repair | CKP System Variation Learn Procedure

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4. Lower the vehicle.
5. Perform the CKP System Variation Learn Procedure. See: Testing and Inspection/Programming and Relearning

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