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 ECU. These signals are used to control the ABS control system. The front and rear rotors have 48 serrations, respectively. When the rotors rotate, the magnetic field emitted by the permanent magnet in the speed sensor generates an AC voltage. Since the frequency of this AC voltage changes in direct proportion to the speed of the rotor, the frequency is used by the ECU to detect the speed of each wheel.

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: Checking Vehicle Speed Signal

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

DIAGNOSTIC TROUBLE CODE CHART

DTC No.	INF Code	DTC Detection Condition	Trouble Area
C0200/31	251 252 253 254 255 256 257 258 259 260 261 262	When one of following conditions is met: Speed of a malfunctioning wheel is 0 km/h (0 mph) for at least 15 sec. when vehicle speed is 10 km/h (6 mph) or more. Speed of the slowest wheel is less than 1/7th of the 2nd slowest wheel for at least 15 sec. when vehicle speed is 10 km/h (6 mph) or more. Abnormal high wheel speed pulse is input for at least 15 sec. Abnormal high wheel speed pulse is input at least 7 times when ECU is on. Speed sensor pulse signal is instantly cut 7 times or more. Speed sensor signal line is open for at least 0.5 sec.	Right front and left front speed sensor Each speed sensor circuit Sensor rotor Sensor installation
C0205/32	264 265 266 267 268 269 270 271 272 273 274 275	When one of following conditions is met: Speed of a malfunctioning wheel is 0 km/h (0 mph) for at least 15 sec. when vehicle speed is 10 km/h (6 mph) or more. Speed of the slowest wheel is less than 1/7th of the 2nd slowest wheel for at least 15 sec. when vehicle speed is 10 km/h (6 mph) or more. Abnormal high wheel speed pulse is input for at least 15 sec. Abnormal high wheel speed pulse is input at least 7 times when ECU is on. Speed sensor pulse signal is instantly cut 7 times or more. Speed sensor signal line is open for at least 0.5 sec.	Right front and left front speed sensor Each speed sensor circuit Sensor rotor Sensor installation
C1271/71 C1272/72	-	Detected only during test mode.	Front speed sensor Front speed sensor circuit Sensor rotor Sensor installation

HINT:

DTC C0200/31 is for the right front speed sensor.
DTC C0205/32 is for the left front speed sensor.
The BRAKE warning light comes on when speed sensor malfunctions are detected in 2 or more wheels.