Circuit Description

Speed sensor at each wheel produces an A/C signal to ABS ECU as 48-tooth rotor passes permanent magnet sensor. Frequency of A/C signal changes with wheel speed. DTC is set when speed sensor signal is not input for approximately 1 second while right front and left rear speed sensor signals are being checked with ignition switch on. Possible causes are:

• Right front or left rear open speed sensor circuit.
• ECU.