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. This speed sensor contains a sensor IC, which consists of 2 MREs (Magnetic Resistance Element). The speed sensor rotor, which consists of 48 sets of N and S poles that are arranged in a circle, is integrated with the inner race of the hub bearing. To detect the rotation direction, the output waves are used to determine the relationship of the pulses that are generated by 2 MREs. Upon receiving this signal, the sensor IC outputs a forward or backward wave to the ECU.

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: Identifying Speed Sensor Rotor

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

DIAGNOSIS TROUBLE CODE CHART

DTC No.	DTC Detection Condition	Trouble Area
C0200/31 C0205/32	When any of the following is detected: 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. Momentary interruption 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. 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 a high frequency pulse 75 times while the engine switch is on (IG). At a vehicle speed of 6 mph (10 km/h) or more, the vehicle speed sensor output drops by 50 % for 5 seconds. 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). 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. At a vehicle speed of 60 mph (100 km/h), a reverse signal is output for 1 second or more. 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. 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 Skid control ECU

HINT:

DTC C0200/31 is for the front speed sensor RH.
DTC C0205/32 is for the front speed sensor LH.