C1275

DTC C1235/35 Foreign Object is Attached on Tip of Front Speed Sensor RH
DTC C1236/36 Foreign Object is Attached on Tip of Front Speed Sensor LH
DTC C1238/38 Foreign Object is Attached on Tip of Rear Speed Sensor RH
DTC C1239/39 Foreign Object is Attached on Tip of Rear Speed Sensor LH
DTC C1275/75 Abnormal Change in Output Signal of Front Speed Sensor RH (Test Mode DTC)
DTC C1276/76 Abnormal Change in Output Signal of Front Speed Sensor LH (Test Mode DTC)
DTC C1277/77 Abnormal Change in Output Signal of Rear Speed Sensor RH (Test Mode DTC)
DTC C1278/78 Abnormal Change in Output Signal of Rear 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.

DTC DETECTION CONDITION:

When foreign matter adheres to the speed sensor tip or sensor rotor, or the rotor teeth are chipped, these DTCs are output. An abnormal waveform input from the sensor determines these conditions. These DTCs may be detected when a malfunction occurs in the connector terminals or wire harness of the speed sensor circuit. DTCs C1275/75 to C1278/78 can be deleted when the speed sensor sends a vehicle speed signal or the Test Mode ends. DTCs C1275/75 to C1278/78 are output only in the Test Mode.

HINT:
^ DTC C1235/35 is for the right front speed sensor.
^ DTC C1236/36 is for the left front speed sensor.
^ DTC C1238/38 is for the right rear speed sensor.
^ DTC C1239/39 is for the left rear speed sensor.

WIRING DIAGRAM:

NOTICE: When replacing the skid control ECU, perform initialization of linear solenoid valve and calibration. Initialization

INSPECTION PROCEDURE

Steps 1-2:

Steps 2 (Continued)-4: