Speed Sensor Diagnostics Inoperative

WARNING: This page is about a different car, the 2000 Lexus SC 400, 2000 Lexus SC 300, 1999 Lexus SC 400, and 1999 Lexus SC 300. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION: If ABS/TRAC ECU replacement is necessary during testing, always ensure ABS/TRAC ECU connectors and ground circuit are okay. If either is suspect, repair and repeat testing to confirm ABS/TRAC ECU malfunction.

Check Ts terminal circuit. See Ts TERMINAL CIRCUIT under SYSTEM TESTS. Ensure ABS/TRAC ECU connectors are clean and tight. Ensure connector terminals are not damaged. Repair as needed. If ABS/TRAC ECU connectors are okay, replace ABS/TRAC ECU.