Toyota Camry Manual page 805

DTC 31, 32, 33, 34, 35, 36 Speed Sensor Circuit
CIRCUIT DESCRIPTION
The speed sensor detects the wheel speed and sends the
appropriate signals to the ECU. These signals are used to
control the ABS system. The front and rear rotors each have
48 serrations. 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.
Diagnostic Trouble Code Detecting Condition
DTC No.
Detection of any of conditions (1) through (3):
(1) At vehicle speed of 10 km/h (6 mph) or
more, pulses are not input for 5 sec.
(2) Momentary interruption of the speed sensor
signal occurs at least 7 times in the time be–
31,32,
tween switching the ignition switch ON and
33,34
switching it OFF.
(3) Abnormal fluctuation of speed sensor signals
with the vehicle speed 20 km/h (12 mph) or
more.
Speed sensor signal is not input for about 1 sec.
while the left front and right rear speed sensor
signals are being checked with the IG switch ON.
Speed sensor signal is not input for about 1 sec.
while the right front and left rear speed sensor
signals are being checked with the IG switch ON.
HINT: DTC No. 31 is for the right front speed sensor.
DTC No. 32 is for the left front speed sensor.
DTC No. 33 is for the right rear speed sensor
DTC No. 34 is for the left rear speed sensor.
Fail safe function: If trouble occurs in the speed sensor circuit, the ECU cuts off current to the ABS
control (solenoid) relay and prohibits ABS control.
BRAKE SYSTEM – ANTI–LOCK BRAKE SYSTEM (ABS)
Trouble area
Right front, left front, right rear and left rear
speed sensor.
Open or short in each speed sensor circuit.
ECU.
Open in left front or right rear speed sensor
circuit.
ECU.
Open in right front or left rear speed sensor
circuit.
ECU.
BR–119