BRAKE CONTROL – VEHICLE STABILITY CONTROL SYSTEM BC–67
DTC C0200/31 Right Front Wheel Speed Sensor Signal
DTC C0205/32 Left Front Wheel Speed Sensor Signal
Foreign Object is Attached on Tip of Front
DTC C1235/35
Speed Sensor RH
Foreign Object is Attached on Tip of Front
DTC C1236/36
Speed Sensor LH
Low Output Signal of Front Speed Sensor RH
DTC C1271/71
(Test Mode DTC)
Low Output Signal of Front Speed Sensor LH
DTC C1272/72
(Test Mode DTC)
Abnormal Change in Output Signal of Front BC
DTC C1275/75
Speed Sensor RH (Test Mode DTC)
Abnormal Change in Output Signal of Front
DTC C1276/76
Speed Sensor LH (Test Mode DTC)
DESCRIPTION
The speed sensors detect the wheel speeds and send appropriate signals to the skid control ECU.
Speed sensor rotors have rows of alternating N and S magnetic poles, and their magnetic fields change
as the rotors turn.
The speed sensors detect those magnetic changes and send pulse signals to the skid control ECU. The
ECU monitors the wheel speeds through these pulse signals to control the ABS control system.
DTCs C1271/71, C1272/72, C1275/75 and C1276/76 can be deleted when the speed sensor sends a
vehicle speed signal or the test mode ends. DTCs C1271/71, C1272/72, C1275/75/75 and C1276/76 are
output only in the test mode.
BC–68 BRAKE CONTROL – VEHICLE STABILITY CONTROL SYSTEM
Front Speed Sensor*1, *2 Skid Control Sensor*1 Speed Sensor
Rear Speed Sensor*2 Speed Sensor
Sensor Rotor
Sensor Rotor
14 mA
7 mA
*1: for 2WD
*2: for 4WD
Low Speed High Speed
C115116E02
BC DTC No. DTC Detection Condition Trouble Area
C0200/31 When one of following conditions is met: • Front speed sensor
C0205/32 1. At vehicle speed of 10 km/h (6 mph) or more, open • Front speed sensor circuit
or short in sensor signal circuit continues for 1 • Sensor installation
second or more. • Foreign matter on sensor rotor
2. Momentary interruption of sensor signal from
abnormal wheel occurs 255 times or more.
3. Open in speed sensor signal circuit continues for
0.5 seconds or more.
4. With IG1 terminal voltage 9.5 V or more, sensor
power supply voltage decreases for 0.5 seconds or
more.
C1235/35 When either of following is detected: • Front speed sensor
C1236/36 1. At vehicle speed of 20 km/h (12 mph) or more, • Front speed sensor circuit
noise in malfunctioning wheel sensor signal • Sensor installation
condition continues for 5 seconds or more.
2. At vehicle speed of 10 km/h (6 mph) or more, noise
input occurs once per rotor rotation for 15 seconds
or more.
C1271/71 Detected only during test mode. • Front speed sensor
C1272/72 • Front speed sensor circuit
• Sensor installation
• Foreign matter on sensor rotor
C1275/75 Detected only during test mode. • Front speed sensor
C1276/76 • Front speed sensor circuit
• Sensor installation
HINT:
• DTCs C0200/31 and C1235/35 relate to the front speed sensor RH.
• DTCs C0205/32 and C1236/36 relate to the front speed sensor LH.
BRAKE CONTROL – VEHICLE STABILITY CONTROL SYSTEM BC–69
WIRING DIAGRAM
Skid Control ECU
FL+
Front Speed Sensor LH
FL-
FR+
Front Speed Sensor RH
FR-
C136041E01
BC
INSPECTION PROCEDURE
NOTICE:
Check the speed sensor signal in test mode after cleaning or replacement (see page BC-28).
1 CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION)
(a) Using the DATA LIST of the intelligent tester, check for
any momentary interruption in the wire harness and
connector corresponding to a DTC (see page BC-23).
Skid control ECU
Item (Display) Measurement Item / Range Normal Condition Diagnostic Note
(Display)
FR SPD OPN FR speed sensor open detection / ERROR: Momentary interruption -
ERROR or NORMAL NORMAL: Normal
FL SPD OPN FL speed sensor open detection / ERROR: Momentary interruption -
ERROR or NORMAL NORMAL: Normal
OK:
There are no momentary interruptions.
HINT:
Perform the above inspection before removing the
sensor and connector.
NG CHECK AND REPAIR HARNESS AND
CONNECTOR (SPEED SENSOR CIRCUIT)
OK
BC–70 BRAKE CONTROL – VEHICLE STABILITY CONTROL SYSTEM
2 READ VALUE OF DATA LIST (FRONT SPEED SENSOR)
(a) Check the DATA LIST for proper functioning of the front
speed sensor.
Skid control ECU
Item (Display) Measurement Item / Range (Display) Normal Condition
FR WHEEL SPD Wheel speed sensor (FR) reading / min.: 0 Similar to speed indicated on speedometer
km/h (0 mph), max.: 326 km/h (202.8 mph)
FL WHEEL SPD Wheel speed sensor (FL) reading / min.: 0 Similar to speed indicated on speedometer
km/h (0 mph), max.: 326 km/h (202.8 mph)
OK:
There is almost no difference between actual wheel
speed and displayed speed value.
HINT:
There is a tolerance of +-10% in the speedometer
indication.
NG Go to step 5
OK
BC
3 PERFORM TEST MODE INSPECTION (SIGNAL CHECK)
(a) Perform a TEST MODE inspection and check for DTCs
(see page BC-28).
OK:
No DTC output.
NG CHECK AND REPAIR HARNESS AND
CONNECTOR (SPEED SENSOR CIRCUIT)
OK
4 RECONFIRM DTC
(a) Clear the DTC(s) (see page BC-47).
(b) Start the engine.
(c) Drive the vehicle at a speed of 20 km/h (12 mph) or more
for at least 60 seconds.
(d) Check if the same DTC(s) is output (see page BC-47).
Result
Result Proceed to
DTC is not output A
DTC is output B
B Go to step 10
END
BRAKE CONTROL – VEHICLE STABILITY CONTROL SYSTEM BC–71
5 INSPECT FRONT SPEED SENSOR (INSTALLATION)
(a) Check that the speed sensor installation bolt is tightened
8.5 N*m properly.
OK:
The installation bolt is tightened properly, and
there is no clearance between the sensor and front
steering knuckle.
Torque: 8.5 N*m (87 kgf*cm, 75 in.*lbf)
NG HINT:
OK No Clearance If the installation portion of the sensor is dirty, clean it and
C108871E03 reinstall the sensor.
Check the speed sensor after the speed sensor replacement
(see page BC-28).
NG TIGHTEN BOLT PROPERLY OR REPLACE
FRONT SPEED SENSOR
OK
6 CHECK SPEED SENSOR (TIP) BC
(a) Remove the front speed sensor.
(b) Check the sensor tip.
OK:
No scratches or foreign matter on the sensor tip.
HINT:
Check the speed sensor signal after the speed sensor
clearing or replacement (see page BC-28).
NG CLEAN OR REPLACE FRONT SPEED
SENSOR
OK
BC–72 BRAKE CONTROL – VEHICLE STABILITY CONTROL SYSTEM
7 CHECK WIRE HARNESS (SKID CONTROL ECU - FRONT SPEED SENSOR)
(a) Disconnect the A19 ECU connector.
Wire Harness Side (b) Disconnect the A41 and A42 sensor connectors.
(c) Measure the resistance of the wire harness side
Skid Control ECU connectors.
Standard resistance:
A19 FR+ FL-
for LH
Tester Connection Specified Condition
A19-18 (FL+) - A41-1 (FL+) Below 1 Ω
A19-4 (FL-) - A41-2 (FL-) Below 1 Ω
A19-18 (FL+) - Body ground 10 kΩ or higher
FR- FL+ A19-4 (FL-) - Body ground 10 kΩ or higher
for RH
Front Speed Sensor
Tester Connection Specified Condition
A19-3 (FR+) - A42-1 (FR+) Below 1 Ω
A19-17 (FR-) - A42-2 (FR-) Below 1 Ω
A19-3 (FR+) - Body ground 10 kΩ or higher
A41 1 2 A42 1 2
BC A19-17 (FR-) - Body ground 10 kΩ or higher
FL+ FL- FR+ FR-
C126328E03 NG REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK
8 CHECK SKID CONTROL ECU (SENSOR INPUT VOLTAGE)
(a) Disconnect the A41 and A42 sensor connectors.
Wire Harness Side
(b) Measure the voltage of the wire harness side connector.
A41 A42 Standard voltage
Tester Connection Condition Specified Condition
A41-2 (FL-) - Body Ignition switch ON 5.7 to 17.3 V
1 2 1 2
ground
A42-2 (FR-) - Body Ignition switch ON 5.7 to 17.3 V
FL- FR- ground
C126292E03
NG REPLACE ABS AND TRACTION ACTUATOR
ASSEMBLY
OK
9 RECONFIRM DTC
(a) Clear the DTC(s) (see page BC-47).
(b) Start the engine.
(c) Drive the vehicle at a speed of 20 km/h (12 mph) or more
for at least 60 seconds.
BRAKE CONTROL – VEHICLE STABILITY CONTROL SYSTEM BC–73
(d) Check if the same DTC(s) is output (see page BC-47).
Result
Result Proceed to
DTC is output A
DTC is not output B
B END
10 REPLACE FRONT SPEED SENSOR
(a) Replace the front speed sensor.
NEXT
11 RECONFIRM DTC
(a) Clear the DTC(s) (see page BC-47).
(b) Start the engine.
(c) Drive the vehicle at a speed of 20 km/h (12 mph) or more
for at least 60 seconds. BC
(d) Check if the same DTC(s) is output (see page BC-47).
Result
Result Proceed to
DTC is output A
DTC is not output B
B END
REPLACE ABS AND TRACTION ACTUATOR ASSEMBLY
