What was found
1 MIN AFTER SHUTDOWN OF APU ON TAXI OUT; APU FAULT LIGHT ILLUMINATED. GROUNDED - YES. PERFORMED APU BITE PROCEDURES CURRENT STATUS PAGE SHOWED 1 FAULT ONLY MSG 49-61223 INLET TEMP SENSOR SHORT CIRCUIT REF B737-900 AMM 49-60 TASK 801. ACCOMPLISHED INLET TEMP SENSOR SHOWS SHORT CIRCUIT-FAULT ISOLATION. MEASURED RESISTANCE ON INLET TEMP SENSOR BOTH PIN A AND PIN B FAILED CK. REMOVED AND REPLACED INLET TEMP SENSOR REF AMM 49-61-31. CK'D WIRE HARNESS AT CONNECTOR D10912 MEASURE RESISTANCE ON PIN 13 AND PIN 14 CHECK GOOD REF B737-900 FIM TASK 49-60 TASK 812. PERFORMED APU BITE PROCEDURES SHOWED NO CURRENT FAULTS RAN APU AND SHUTDOWN NO FAULT LIGHT AND CURRENT STATUS SHOWED NO FAULTS REF FIM 49-60 TASK 801.