TC reported TIMS showed BCU wheel slip/slide protection timer fault. Fault intermittent and self cle ared. Train performance - ok. Fault appears during braking. ~~~~~ 3556 TC reported TIMS showed BCU WSS protection timer fault. Fault intermittent and self cleared. Train performance - ok. Fault appears during braking. CE 3556 wheel s/s, WSP active axle 4 'ON'  3556 Checked BCU canon plug wire from tachogen found O/L A/B Connector pin. Techogen #4 faulty . Further checked on BCU cable - no abnormalities found. (Train not clear) OPS20 Raise for spare replacement. Fadly/Farid/Rajamohan/Aiman/Aliff 45103 Awaiting spare tachogen FC 327/322/323 Cnange out tachogen axle #4 & tachogen cable. Checked connector pin P-J resistence value (1.05k ohm)-OK Perform dump v/v test -OK.    Depot shunting - No WSS. Alan/Anand/Kamarul/Sugu 45103 TECHOGEN S/N: OLD: 9919012 NEW: 1512530