Electronically Controlled Brake System

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

DESCRIPTION

DTC Detection Condition (Part 1):

DTC Detection Condition (Part 2):

The speed sensor detects wheel speed and sends the appropriate signals to the ECU. These signals are used to control the ABS 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 C1273/73 and C1274/74 can be deleted when the speed sensor sends a vehicle speed signal or the Test Mode ends. DTCs C1273/73 and C1274/74 are output only in the Test Mode.

HINT:
- DTC C0210/33 is for the right rear speed sensor.
- DTC C0215/34 is for the left rear speed sensor.

Wiring Diagram:

Step 1:

Step 1(Continued)-3:

Step 4-6:

Step 6(Continued)-7:

Step 8-9:

Step 9(Continued)-12:

Step 12(Continued)-13:

INSPECTION PROCEDURE

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

HINT: Start the inspection from "CHECK HARNESS AND CONNECTOR" when using the intelligent tester and start from "PERFORM TEST MODE" when not using the intelligent tester.