B737 FLT CREW PERFORMS A PARTIAL 15 DEG FLAP LNDG; OVERRIDING THE FLAPS ELECTRICALLY WHEN FLAP INDICATORS SHOW THE FLAPS STOPPING AT 5 DEGS ON FINAL APCH TO RWY 23 AT CYYZ; ON.

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FLYING AT 3000 FT MSL ON RADAR VECTOR FROM APCH CTL AT 210 KIAS. APCH TURNED US TOWARD THE ILS RWY 23 LOC COURSE (ON A PLANNED VISUAL APCH DUE TO WX). APCH TOLD US TO SLOW TO 170 KIAS; AND CAPT (PF) CALLED FOR FLAPS 1 DEG; THEN FLAPS 5 DEGS; AND FINALLY FLAPS 10 DEGS. FLAPS MOVED FROM 0 DEGS TO 1 DEG; THEN FROM 1 DEG TO 5 DEGS; ON COMMAND. UPON SELECTING FLAPS 10 DEGS; FLAPS STUCK AT FLAPS 5 DEGS. CAPT CALLED FOR 'TRAILING EDGE FLAPS MALFUNCTION' CHKLIST FROM QRH. DURING PROC; IT WAS DETERMINED THAT AN 'ASYMMETRY' WAS NOT INDICATED; AND CHKLIST WAS TEMPORARILY SUSPENDED UNTIL MAINT CTL WAS CALLED. THEY AGREED WITH CAPT THAT THE ELECTRICAL (ALTERNATE) METHOD OF FLAP EXTENSION WAS INDICATED; AND CHKLIST WAS CONTINUED TO ITS CONCLUSION. WE LANDED WITH FLAPS AT 15 DEGS; AT FLAPS 15 DEGS REF. WE DID NOT DECLARE AN EMER; AND DID NOT CALL FOR EQUIP TO BE STANDING BY DUE TO VREF 15 DEGS ONLY BEING 8 KTS HIGHER THAN VREF 30 DEGS; AND DUE TO FACT THAT WE WERE ON A VISUAL APCH. LNDG FOLLOWED WITHOUT INCIDENT. IN THE MORNING; MAINT PERSONNEL HAD REPLACED THE FLAP GAUGE; AND CLRED THE WRITE-UP.