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Home >> Lexus >> 2006 >> GS 300 RWD >> Repair and Diagnosis >> Brakes >> Brakes Control Systems >> Brake Control >> Vehicle Stability Control System >> DTC C0200/31 Front Speed Sensor RH Circuit; DTC C0205/32 Front Speed Sensor LH Circuit; DTC C1271/71 Low Output Signal of Front Speed Sensor RH (Test Mode DTC); DTC C1272/72 Low Output Signal of Front Speed Sensor LH (Test Mode DTC) >> Description
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DTC C0200/31 Front Speed Sensor RH Circuit; DTC C0205/32 Front Speed Sensor LH Circuit; DTC C1271/71 Low Output Signal of Front Speed Sensor RH (Test Mode DTC); DTC C1272/72 Low Output Signal of Front Speed Sensor LH (Test Mode DTC): Description

The speed sensor detects wheel speed and sends the appropriate signals to the skid control ECU. These signals are used for the ABS control system. The speed sensor detects changes in the magnetic field generated by the magnetic rotor which has the north and south poles evenly located in circumferential direction and generates the vehicle speed pulse. The skid control ECU detects each wheel speed based on the vehicle speed pulse.

DTCs C1271/71 and C1272/72 can be deleted when the speed sensor sends a vehicle speed signal or the test mode ends. DTCs C1271/71 and C1272/72 are output only in the test mode.

Fig 1: Front Speed Sensor Circuit - Description Diagram
G04024976Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
DTC DETECTION CONDITION

DTC No. DTC Detecting Condition Trouble Area
C0200/31 
C0205/32		 When any of the following is detected:
  1. At a vehicle speed of 6 mph (10 km/h) or more, an open or short in the sensor signal circuit continues for 1 second or more.
  2. Momentary interruption of the sensor signal from the abnormal wheel occurs 255 times or more.
  3. An open in the speed sensor signal circuit continues for 0.5 seconds or more.
  4. When the vehicle is driven in reverse at the speed of 1.8 mph (3 km/h) or more and 3 of the wheel sensors detect the reverse signal, the other sensor detects high frequency pulse 75 times while the engine switch is on (IG).
  5. At a vehicle speed of 6 mph (10 km/h) or more, the vehicle speed sensor output halves for 5 seconds.
  6. At a vehicle speed of 6 mph (10 km/h) or more, the direction of wheel rotation changes 7 times in 0.006 seconds while the engine switch is on (IG).
  7. At a vehicle speed of 18 mph (30 km/h) or more, one wheel direction is different from the other 3 wheels' for 1 second.
  8. At a vehicle speed of 60 mph (100 km/h), a reverse signal is output for 1 second or more.
  9. At a vehicle speed of 18 mph (30 km/h) or more, the rotation direction of the one of the wheels is not detected normally and the rotation direction of the other 3 wheels is not the same for 1 second.
  10. With the IG1 terminal voltage 9.5 V or more, the sensor power supply voltage decreases for 0.5 seconds or more.
  • Right front and left front speed sensor
  • Each speed sensor circuit
  • Sensor rotor
  • Sensor installation
  • ABS and TRACTION actuator assembly (Skid control ECU)

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