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Home >> Lexus >> 2000 >> RX 300 AWD >> Repair and Diagnosis >> Brakes >> Traction Control >> Anti-Lock W/Traction Control >> Diagnostic Tests >> DTC 32: Left Front Wheel Speed Sensor Circuit >> Circuit Description

Circuit Description

Speed sensor at each wheel sends an AC signal to ABS/TRAC ECU as the 48-tooth rotor passes a permanent magnet sensor. Frequency of AC signal changes with wheel speed.

Diagnostic Trouble Code (DTC) is set when no speed sensor pulses are input to ABS/TRAC ECU for 15 seconds with vehicle speed 6 MPH or more. Momentary interruption of speed sensor signal occurs at least 7 times during cycle of ignition switch. DTC will also set if abnormal speed sensor signal fluctuation lasts for more than 5 seconds with vehicle speed of 12 MPH or more.

If fault occurs in speed sensor circuit, ABS/TRAC ECU performs a fail safe function, turning off current to ABS solenoid relay and prohibiting ABS and TRAC. Possible causes are:

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