{"model":"mk4","model_name":"MK4 Supra","vehicle":"Toyota Supra A80 (1993–2002, 2JZ-GE / 2JZ-GTE)","document":"Repair Manual","section":"BAT","section_name":"Brakes, ABS & TRAC Systems","page":138,"pages_in_section":167,"title":"Dtc 31 32 33 34 Speed Sensor Circuit","section_header":"Brake System — Traction Control System (TRAC)","ocr_text":"BR–138\nBRAKE SYSTEM – TRACTION CONTROL SYSTEM (TRAC)\n\nDTC 31 32 33 34 Speed Sensor Circuit\n\nCIRCUIT DESCRIPTION\n\nThe speed sensor detects the wheel speed and sends the ap-\npropriate signals to the ECU. These signals are used to control\nboth the ABS and TRAC control systems. The front and rear ro-\ntors each have 48 serrations. When the rotors rotate, the magnet-\nic field emitted by the permanent magnet in the speed sensor\ngenerates an AC voltage. Since the frequency of this AC voltage\nchanges in direct proportion to the speed of the rotor, the frequen-\ncy is used by the ECU to detect the speed of each wheel.\n\nRotor        Speed Sensor\n              N   S  Magnet\nCoil\n              To ECU\n\nHigh Speed    Low Speed\n\nBR3583\nBR3582\n\nDTC No.    Diagnostic Trouble Code Detecting Condition    Trouble area\n\n31, 32\n33, 34\n\nDetection of any of conditions (1) through (3):\n(1) At vehicle speed of 10 km/h (6 mph) or\n    more, pulses are not input for 5 sec.\n(2) Momentary interruption of the vehicle\n    speed sensor signal occurs at least 7\n    times in the time between switching the\n    ignition switch ON and switching it OFF.\n(3) Abnormal fluctuation of speed sensor\n    signals with the vehicle speed 20 km/h\n    (12 mph) or more.\n\n• Right front, left front, right rear and left\n  rear speed sensor.\n• Open or short in each speed sensor circuit.\n• ECU\n\nHINT: DTC No.31 is for the right front speed sensor.\n      DTC No.32 is for the left front speed sensor.\n      DTC No.33 is for the right rear speed sensor.\n      DTC No.34 is for the left rear speed 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transcript of a scanned Toyota factory manual page; verify critical values (torque specs, part numbers) against the image."}