Low Output Signal of Front Speed Sensor RH (Test Mode DTC)

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.

DTC DETECTION CONDITION:

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.

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

WIRING DIAGRAM:

NOTICE: When replacing the skid control ECU, perform zero point calibration.

INSPECTION PROCEDURE

Step 1:

Steps 1 (Continued)-3:

Steps 4-5:

Step 6:

Steps 7-9:

Steps 9 (Continued)-11:

Steps 12-13: