C1331 Toyota Avalon

The speed sensor detects wheel speed and transmits the appropriate 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 skid control ECU to detect the speed of each wheel. DTCs C1271/71, C1272/72, C1275/75 and C1276/76 are output only in the test mode (SIGNAL CHECK). During test mode (SIGNAL CHECK), the skid control ECU records DTCs, if the abnormal sensor signal is received.

Rotor

Speed Sensor N S Magnet

To ECU

Coil

DTC No.

DTC Detecting Condition

Trouble Area

C0200/31 C0205/32

When either of the following (1 or 2) is detected :

1. Rapid acceleration/deceleration continues for 20 seconds or more with the brake pedal depressed, or for 5 seconds or more without the brake pedal depressed.

2. A wheel speed of 0 mph (0 km/h) is detected when the vehicle speed has reached 8 mph (12 km/h) after starting the vehicle.

• Front speed sensor RH and/or LH

• Front speed sensor circuit RH and/or LH

• Speed sensor rotor RH and/or LH

• Sensor installation

• Brake actuator assembly (skid control ECU)

C1330/35 C1331/36

Abnormality in the resistance value of each speed sensor is detected.

• Front speed sensor RH and/or LH

• Speed sensor circuit RH and/or LH

• Sensor installation

HINT:

DTC No.C0200/31 and C1330/35 are for the front speed sensor RH. DTC No.C0205/32 and C1331/36 are for the front speed sensor LH.

Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

Don't pay hundreds of dollars to find out what is wrong with your car. This book is dedicated to helping the do it yourself home and independent technician understand and use OBD-II technology to diagnose and repair their own vehicles.

Get My Free Ebook


Post a comment