C1237

ANTI-LOCK BRAKE SYSTEM: C1237/37: Speed Sensor Rotor Faulty

DTC C1237/37 - Speed Sensor Rotor Faulty

DESCRIPTION

The skid control ECU measure the speed of each wheel by receiving signals from speed sensor. These signals are used for recognizing all 4 wheels are operating properly.

INSPECTION PROCEDURE

PROCEDURE

1. INSPECT TIRE SIZE
(a) Check tire size and condition of all 4 wheels.
OK:
The diameter of all of four tires and air pressure are the same.
NG -- REPLACE TIRES SO THAT ALL 4 TIRES ARE SAME IN SIZE
OK -- Continue to next step.
2. INSPECT SPEED SENSOR ROTOR
(a) Check the sensor rotor serrations (ABS (Antilock Brake System)) for front, or (ABS (Antilock Brake System)) for rear).
OK:
No scratches, missing teeth or foreign matter on the sensor rotor.
NG -- REPLACE SENSOR ROTOR
OK -- Continue to next step.
3. INSPECT SPEED SENSOR
(a) Remove the speed sensor (Removal) for front, or (Removal) for rear).
(b) Check the sensor tip.
OK:
No scratches or foreign matter on the sensor tip.
NG -- REPLACE SPEED SENSOR
OK -- Continue to next step.
4. CHECK HARNESS AND CONNECTOR (SPEED SENSOR - SKID CONTROL ECU)

(a) Disconnect the skid control ECU connector, front speed sensor connectors and rear speed sensor connectors.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE BRAKE ACTUATOR ASSEMBLY