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 the wheel speed and sends the appropriate signals to the skid control ECU. These signals are used for the ABS control system.

Speed sensor rotors have 48 serrations. The hall IC type speed sensor use the frequency of output pulses to detect the vehicle speed. Because the sensor outputs digital pulses, it can detect vehicle speeds even when the vehicle is nearly stationary.

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

Fig 1: Front Speed Sensor Operation Diagram With Output Pulse

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

DTC DETECTION CONDITION AND TROUBLE AREA REFERENCE CHART

DTC Code	DTC Detection Condition	Trouble Area
C0200/31 C0205/32	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 interruptions of the sensor signal from the abnormal wheel occurs 255 times or more. An open in the speed sensor signal circuit continues for 0.5 seconds or more. With the IG1 terminal voltage 9.5 V or more, the sensor power supply voltage decreases 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.