GND TFC CONFLICT WHEN AN ACR B737 ENTERS THE WRONG TXWY DURING DEP TAXI AT PHX; AZ.

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PERFORMANCE DATA FROM THE OPC SHOWED DUE TO THE HIGH TEMP AND LOAD THAT RWY 26 WAS THE PREFERRED RWY. TAXI CLRNC FROM PARKING IN PHOENIX WAS GIVEN FROM GND CTL TO TAXI TO RWY 26 VIA TXWYS D; T; HOLD SHORT OF TXWY C AND CONTACT N GND ON TXWY T. THE TAXI CLRNC WAS READ BACK VERBATIM BY MYSELF TO GND CTL AND THEN REPEATED IN THE COCKPIT EXACTLY BY THE CAPT BEFORE TAXI. UPON APCHING TXWY S; I CHKED TO MY R JUST TO SEE IF THERE WOULD BE ANY CONFLICTS; BECAUSE AS ADDRESSED IN EPT IN MAY BY THE ATC REPRESENTATIVE THAT THE TAXI FLOW FOR TXWYS T AND S (SINCE CHANGED) FROM PREVIOUS YRS WAS STILL CAUSING PROBS FOR AIRCREWS. NO OTHER ACFT WAS ON THE TXWYS T OR S. THE CAPT STARTED TO TURN N ON TXWY S. ABOUT THE SAME TIME I LOOKED FORWARD AND POINTED AND SAID TXWY T; BUT IT WAS TOO LATE AND WE PROCEEDED NBOUND ON TXWY S AND CHKED IN WITH N GND CTL. THEY ADVISED A B737-300 TO HOLD SHORT OF TXWY S AND THAT COMPANY WAS ON THE WRONG TXWY. I APOLOGIZED FOR OUR ERROR AND WAS GIVEN THE TAXI INSTRUCTIONS TO TURN R ON TXWY B TO RWY 26. NO FURTHER INSTRUCTIONS OR NOTIFICATION TO 'CALL US LATER' WERE GIVEN BY GND OR TWR. MY PERCEPTION WAS THAT WE WOULD TURN N ON TXWY T SINCE WE BOTH UNDERSTOOD AND REPEATED THE EXACT TAXI INSTRUCTIONS; THUS THE DELAYED REACTION ON MY PART TO CORRECT THE TURN. I HAVE FLOWN THIS EXACT TRIP THE WEEK BEFORE WITH A DIFFERENT CAPT AND THE NORMAL TKOF WAS RWY 25R; BUT DUE TO THE HIGHER TEMP THIS DAY; RWY 26 WAS PLANNED. I BELIEVE OUR PREVIOUS HABIT PATTERNS AND THAT TXWY S WAS THE FIRST ONE TO SEE ALLOWED FOR THE ERROR TO OCCUR. I ALSO NEED TO BE MORE DILIGENT TO AID THE CAPT'S DECISION MAKING PROCESS SO THAT THIS WILL NOT HAPPEN AGAIN. I ALSO SUGGEST THAT THE CHART FOR STANDARD TAXI ROUTES FOR N TAXI ON TXWY S BE UPDATED TO THE CURRENT TAXI FLOW AND THAT A NOTE OF CAUTION BE ADDED TO THE COMPANY PAGE CONCERNING THE S FLOW FOR TXWY S AND NORTH FLOW FOR TXWY T. THE ARPT DIAGRAM WAS OUT FOR BOTH OF US; BUT COULD ALSO HAVE A NOTE CONCERNING THE PREFERRED TAXI FLOW FOR TXWYS R; S; AND T FOR OTHER ACR'S AND CREWS. FINALLY; IT WOULD BE A GREAT SITUATIONAL ENHANCEMENT TO GET THE ELECTRONIC ARPT DIAGRAM DISPLAYED ON A SCREEN IN THE COCKPIT.