DTC C0200/31, C0205/32, C1271/71, C1272/72: Front Speed Sensor RH Circuit; Front Speed Sensor LH Circuit; Low Output Signal of Front Speed Sensor RH (Test Mode DTC); Low Output Signal of Front Speed Sensor LH (Test Mode DTC): Description

The speed sensors detect wheel speed and transmit the signals to the ECU. These signals are used for control of the ABS control system. Each of the front and rear rotors have 48 serrations. When the rotors rotate, the magnetic filed generated by the permanent magnet in the speed sensor induces 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 wheel speed signal or the Test Mode ends. DTCs C1271/71 and C1272/72 are output only in the Test Mode.

Fig 1: Speed Sensor Output Voltage Signals Graph

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

DTC Code	DTC Detection Condition	Trouble Area
C0200/31 C0205/32	When any of the following is detected: At a vehicle speed of 10 km/h (6 mph) or more, an open or short in the sensor signal circuit continues for 1 second or more. Momentary interruption of the sensor signal from the abnormal wheel occurs 7 times or more. An open in the speed sensor signal circuit continues for 0.5 seconds or more.	Front speed sensor RH/LH Speed sensor circuit Speed sensor rotor Sensor installation Brake actuator assembly (Skid control ECU)
C1271/71 C1272/72	Detected only during Test Mode.	Front speed sensor RH/LH Sensor installation Speed sensor rotor

HINT:

DTCs C0200/31 and C1271/71 are for the front speed sensor RH.
DTCs C0205/32 and C1272/72 are for the front speed sensor LH.