C1330

ANTI-LOCK BRAKE SYSTEM: C0200/31: Front Speed Sensor RH Circuit

DTC C0200/31 - Front Speed Sensor RH Circuit

DTC C0205/32 - Front Speed Sensor LH Circuit

DTC C1330/35 - Right Front Speed Sensor Circuit

DTC C1331/36 - Left Front Speed Sensor Circuit

DESCRIPTION

The speed sensor detects wheel speed and transmits the appropriate signals to the 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 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.

HINT: DTC Code C0200/31 and C1330/35 are for the right front speed sensor.

DTC Code C0205/32 and C1331/36 are for the left front speed sensor.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE OF TECHSTREAM (FRONT SPEED SENSOR)
(a) Connect Techstream to the DLC3.
(b) Start the engine.
(c) Select the Data List mode on Techstream.

ABS / VSC / TRAC:

(d) Check that there is no difference between the speed value output from the speed sensor displayed on Techstream and the speed value displayed on the speedometer when driving the vehicle.
OK:
There is almost no difference in the displayed speed value.

HINT: There is tolerance of ± 10 % in the speedometer indication.

NG -- INSPECT FRONT SPEED SENSOR
OK -- Continue to next step.
2. INSPECT SPEED SENSOR AND SENSOR ROTOR SERRATIONS

(a) INSPECTION USING OSCILLOSCOPE
(1) Connect the oscilloscope to terminals FR+ - FR- and FL+ - FL- of the skid control ECU
(2) Drive the vehicle at about 19 mph (30 km/h), and check the signal waveform.
OK:
A waveform as shown in a figure should be output.

- As vehicle speed (wheel revolution speed) increases, a cycle of the waveform narrows and the fluctuation in the output voltage becomes greater.
- When noise is identified in the waveform on the oscilloscope, error signals are generated due to the speed sensor rotor's scratches, looseness or foreign matter attached to it.

NG -- INSPECT FRONT SPEED SENSOR INSTALLATION
OK -- REPLACE BRAKE ACTUATOR ASSEMBLY
3. INSPECT FRONT SPEED SENSOR

(a) Make sure that there is no looseness at the connectors locking part and connecting part of connectors A4 or A5.
(b) Disconnect the speed sensor connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:

LH:

RH:

(d) Measure the resistance according to the value(s) in the table below.
Standard resistance:

LH:

RH:

NOTE: Check the speed sensor signal after the speed sensor replacement (Test Mode Procedure).

NG -- REPLACE FRONT SPEED SENSOR
OK -- Continue to next step.
4. CHECK HARNESS AND CONNECTOR (FRONT SPEED SENSOR - SKID CONTROL ECU)

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

LH:

RH:

NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.
5. INSPECT SPEED SENSOR AND SENSOR ROTOR SERRATIONS

(a) INSPECTION USING OSCILLOSCOPE
(1) Connect the oscilloscope to terminals FR+ - FR- and FL+ - FL- of the skid control ECU.
(2) Drive the vehicle at about 19 mph (30 km/h), and check the signal waveform.
OK:
A waveform as shown in a figure should be output.

- As vehicle speed (wheel revolution speed) increases, a cycle of the waveform narrows and the fluctuation in the output voltage becomes greater.
- When noise is identified in the waveform on the oscilloscope, error signals are generated due to the speed sensor rotor's scratches, looseness or foreign matter attached to it.

NG -- INSPECT FRONT SPEED SENSOR INSTALLATION
OK -- REPLACE BRAKE ACTUATOR ASSEMBLY
6. INSPECT FRONT SPEED SENSOR INSTALLATION

(a) Check the speed sensor installation.
OK:
The installation bolt is tightened properly
There is no clearance between the sensor and front steering knuckle.
Torque: 8.0 Nm (82 kgf-cm, 71 in-lbf)

NOTE: Check the speed sensor signal after speed sensor replacement (Test Mode Procedure).

NG -- REPLACE FRONT SPEED SENSOR
OK -- Continue to next step.
7. INSPECT SPEED SENSOR TIP
(a) Remove the front speed sensor (Removal).
(b) Check the sensor tip.
OK:
No scratches or foreign matter on the sensor tip.

NOTE: Check the speed sensor signal after cleaning (Test Mode Procedure).

NG -- CLEAN OR REPAIR SPEED SENSOR
OK -- Continue to next step.
8. INSPECT SPEED SENSOR ROTOR

(a) Remove the front drive shaft.
(b) Check the sensor rotor serrations.
OK:
No scratches, missing teeth or foreign matter on the sensor rotor.

HINT: If a foreign matter is attached, remove it and after reassembling, check the output waveform.

NOTE: Check the speed sensor signal after cleaning (Test Mode Procedure).

NG -- CLEAN OR REPLACE SPEED SENSOR ROTOR
OK -- REPLACE BRAKE ACTUATOR ASSEMBLY