AN MLG ACR CREW MADE AN ALTDEV IN RESPONSE TO TCASII. NO TFC WAS SEEN VISUALLY OR ON RADAR. THE FAA IS INVESTIGATING THE INCIDENT.

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ON THE FINAL ENRTE PHASE TO SMF FROM SAN; WE RECEIVED A TCASII TA AT AN ALT OF 11000 FT IN CRUISE. THE TFC SHOWED UP AT ABOUT 5 MI N OF OUR LOCATION AND SHOWED 300 FT BELOW. AT ABOUT 3 MI N WE RECEIVED A TCASII RA. THE TCASII RESOLUTION SHOWED THAT WE SHOULD CLB AT ABOUT 1200 FPM TO RESOLVE THE SITUATION. I CLBED AT ABOUT 1300 FPM TO ABOUT 11700 FT UNTIL WE WERE A COUPLE OF MI PAST THE TFC; THEN DSNDED TO 11000 FT. APCH SAID THEY DID NOT HAVE TFC IN THAT AREA. WE NEVER LOCATED THE TFC THAT TCASII SHOWED AS WE WERE APPROX 10 MI S OF SAC VOR ON THE STAR WHEN THE TCASII NOTIFIED US OF THE TFC. APCH WAS NOTIFIED OF A TCASII ALERT AND WAS TOLD WE WERE CLBING TO AVOID TFC. WHEN WE GOT ON THE GND; GND CTL GAVE US A NUMBER TO CALL APCH CTL AND THE CAPT WAS TOLD THEY WERE FILING AN ALTDEV ON US FOR CLBING ON TCASII INSTRUCTIONS. I DO NOT UNDERSTAND THE REASON FOR THE VIOLATION AS WE WERE FOLLOWING PROC. THERE NEEDS TO BE A CLR CUT PROC DEFINED BY THE FAA IN THESE CASES AS I'M SURE ITS NOT THE FIRST TIME THIS HAS HAPPENED AND IT WILL NOT BE THE LAST; EVEN BY MYSELF.