M20P ON APCH TO CNO IS CLRED TO LAND AND SUBSEQUENTLY GIVEN GAR BECAUSE OF TFC ON RWY.

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ON JUL/SAT/04; I WAS ON AN IFR TWR-TWR CLRNC VNY TO CNO. WHEN I RPTED THE FIELD IN SIGHT; THE SOCAL CTLR ASKED IF I WISHED TO CANCEL; AND I SAID I DID. I MAINTAINED THE SAME XPONDER CODE. I RECEIVED VARIOUS VECTORS TO THE ILS RWY 26R FINAL; WAS CLRED FOR THE APCH; AND INTERCEPTED THE LOC AT 3000 FT AS INSTRUCTED. I STARTED A DSCNT TO 2100 FT AS REQUIRED AND WAS SWITCHED TO THE CNO TWR FREQ BY SOCAL. I RPTED MY LOCATION TO THE CNO TWR; AND WAS CLRED FOR A 'LOW APCH.' I TOLD THE TWR CTLR THAT I WANTED A FULL STOP AND I WAS PROMPTLY CLRED TO LAND. I REPEATED BACK ALL CLRNCS TO ALL CTLRS. AT APPROX 1 MI FROM THE TOUCHDOWN ZONE; I WAS TOLD TO 'GO AROUND.' I LOOKED UP FROM THE INST PANEL AND SAW A TWIN-ENG AIRPLANE PULLING TO A STOP ON RWY 26R. I SAID I WAS GOING AROUND AND SAID I WOULD FLY DOWN THE R SIDE OF THE RWY TO KEEP THE TWIN IN SIGHT. THE CNO CTLR TOLD ME WITH A HARSH TONE TO 'START YOUR L TURN NOW!' I IMMEDIATELY COMPLIED; OVERFLEW RWY 26R; AND FLEW TOWARD THE L DOWNWIND LEG OF A VFR APCH TO THE SAME RWY. I STAYED WITH THE TWR FREQ AS I WAS VFR AND IN VMC. I EXTENDED THE XWIND LEG TO THE PDZ VORTAC; AND RPTED MY LOCATION TO THE CNO TWR. I WAS IN THE CNO AIRSPACE AT THIS TIME. I TURNED TOWARD THE ARPT AND AGAIN RPTED INBOUND WITH THE ATIS. I WAS TOLD BY THE TWR 'FREQ CHANGE APPROVED.' I HAD NO IDEA WHAT HE WAS TALKING ABOUT; SO I WENT BACK TO SOCAL. I SWITCHED TO SOCAL AND HEARD A REF FROM THE CTLR TO AN ACFT 'NOT TALKING TO ANYBODY.' I IMMEDIATELY RPTED MY POS AND ALT; AND RECEIVED A NEW XPONDER CODE. THIS PROB WAS CAUSED; I BELIEVE; BY THE CNO TWR CTLR CLRING AN AIRPLANE ONTO RWY 26R AFTER CLRING ME TO LAND; AND WHILE I WAS ON SHORT FINAL. HE DID THIS BECAUSE HE FORGOT THAT I WAS NOT A 'LOW APCH.' HIS REF TO THE 'L TURN' WAS A REF TO THE MISSED APCH PROC OF THE ILS RWY 26R APCH. THE CTLR THOUGHT I WAS IFR ON A PRACTICE APCH RATHER THAN VFR PREPARING TO LAND. AFTER TELLING ME TO EXECUTE A L TURN; HE COMPLETELY LOST TRACK OF ME; ALTHOUGH I CALLED HIM AT LEAST TWICE. THERE WAS NO DANGER; ALTHOUGH OVERFLYING AN ACTIVE RWY WAS NOT SOMETHING I WOULD NORMALLY DO AT LESS THAN 1000 FT AGL.