ABS (Antilock Brake System)

DTC C1274/74 Low Output Signal of Rear Speed Sensor LH (Test Mode DTC)

DESCRIPTION

DTC Detecting Condition:

The speed sensors detect wheel speed and transmit the signals to the skid control ECU. These signals are used for control of the ABS control system. Each of the front and rear rotors has 48 serrations.




When the rotors rotate, the magnetic field generated by the permanent magnet in the speed sensor induces 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 from C1273/73 to C1278/78 can be deleted when the speed sensor sends a vehicle speed signal or the test mode ends. DTCs from C1273/73 to C1278/78 are output only in the test mode.

HINT:
DTC No. C0210/33 and C1332/38 are for the rear speed sensor RH.
DTC No. C0215/34 and C1333/39 are for the rear speed sensor LH.

Wiring Diagram:

Step 1:

Step 2-4:

Step 4(continued)-5:

Step 6:

Step 7-8:

Step 8(continued)-10:

Step 10(continued)-12:

Step 12(continued):

INSPECTION PROCEDURE

HINT: Check the condition of each related circuit connector before troubleshooting.