Page 2385 of 3000

BC–18BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEM
BC
Test Mode DTC of ABS:
C1236/36Foreign Object is Attached on Tip
of Front Speed Sensor LH1. Front speed sensor LH
2. Speed sensor rotor
3. Sensor installation
4. Brake actuator assemblyBC-17
C1238/38Foreign Object is Attached on Tip
of Rear Speed Sensor RH1. Rear speed sensor RH
2. Speed sensor rotor
3. Sensor installation
4. Brake actuator assemblyBC-23
C1239/39Foreign Object is Attached on Tip
of Rear Speed Sensor LH1. Rear speed sensor LH
2. Speed sensor rotor
3. Sensor installation
4. Brake actuator assemblyBC-23
C1241/41 Low Battery Positive Voltage1. Battery
2. ECU-IG fuse
3. Charging system
4. Power source circuitBC-37
C1249/49 Open in Stop Light Switch Circuit1. Stop light switch
2. Stop light switch circuitBC-41
C1251/51 Open in Pump Motor Circuit1. ABS pump motor circuit
2. Brake actuator assemblyBC-45
DTC Code Detection Item Trouble Area See page
C1271/71Low Output Signal of Front Speed
Sensor RH (Test Mode DTC)1. Front speed sensor RH
2. Sensor installation
3. Speed sensor rotorBC-17
C1272/72Low Output Signal of Front Speed
Sensor LH (Test Mode DTC)1. Front speed sensor LH
2. Sensor installation
3. Speed sensor rotorBC-17
C1273/73Low Output Signal of Rear Speed
Sensor RH (Test Mode DTC)1. Rear speed sensor RH
2. Sensor installation
3. Speed sensor rotorBC-23
C1274/74Low Output Signal of Rear Speed
Sensor LH (Test Mode DTC)1. Rear speed sensor LH
2. Sensor installation
3. Speed sensor rotorBC-23
C1275/75Abnormal Change in Output
Signal of Front Speed Sensor RH
(Test Mode DTC)Speed sensor rotorBC-17
C1276/76Abnormal Change in Output
Signal of Front Speed Sensor LH
(Test Mode DTC)Speed sensor rotorBC-17
C1277/77Abnormal Change in Output
Signal of Rear Speed Sensor RH
(Test Mode DTC)Speed sensor rotorBC-23
C1278/78Abnormal Change in Output
Signal of Rear Speed Sensor LH
(Test Mode DTC)Speed sensor rotorBC-23 DTC Code Detection Item Trouble Area See page
Page 2386 of 3000

BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEMBC–19
BC
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. The front and rear rotors have 48 serrations each.
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.
DTCs C1271/71 to C1276/76 can be deleted when the speed sensor sends a vehicle speed signal or the
Test Mode ends. DTCs C1271/71 to C1276/76 are output only in the Test Mode.
DTC C0200/31 Front Speed Sensor RH Circuit
DTC C0205/32 Front Speed Sensor LH Circuit
DTC C1235/35Foreign Object is Attached on Tip of Front
Speed Sensor RH
DTC C1236/36Foreign Object is Attached on Tip of Front
Speed Sensor LH
DTC C1271/71Low Output Signal of Front Speed Sensor RH
(Test Mode DTC)
DTC C1272/72Low Output Signal of Front Speed Sensor LH
(Test Mode DTC)
DTC C1275/75Abnormal Change in Output Signal of Front
Speed Sensor RH (Test Mode DTC)
DTC C1276/76Abnormal Change in Output Signal of Front
Speed Sensor LH (Test Mode DTC)
F000010E04
Page 2387 of 3000

BC–20BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEM
BC
HINT:
• DTC No. C0200/31 and C1235/35 are for the front speed sensor RH.
• DTC No. C0205/32 and C1236/36 are for the front speed sensor LH.
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
Start the inspection from step 1 when using the intelligent tester and start from step 2 when not using the
intelligent tester.
(a) Select the DATA LIST mode on the intelligent tester.
ABS:
DTC No. DTC Detection Condition Trouble Area
C0200/31
C0205/32With vehicle speed at 10 km/h (6 mph) or more, sensor
signal circuit of faulty wheel is open or short for 1
second or more.
• Momentary interruption of sensor signal of faulty
wheel has occurred 7 times or more.
• Sensor signal circuit is open for 0.5 seconds or
more.• Front speed sensor RH/LH
• Front speed sensor RH/LH circuit
• Speed sensor rotor
• Sensor installation
• Brake actuator assembly
C1235/35
C1236/36At vehicle speed of 20 km/h (12 mph) or more,
condition that noise is included in speed sensor signal
continues for 5 seconds or more.• Front speed sensor RH/LH
• Speed sensor rotor
• Sensor installation
• Brake actuator assembly
1READ VALUE OF INTELLIGENT TESTER (FRONT SPEED SENSOR)
F040884E10
Item (Display)Measurement Item / Range
(Display)Normal Condition Diagnostic Note
WHEEL SPD FRWheel speed sensor (FR)
reading / min.: 0 km/h (0 mph),
max.: 326 km/h(202 mph)Actual wheel speedSimilar speed as indicated on
speedometer
Page 2388 of 3000

BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEMBC–21
BC
(b) Check that there is the speed value output from the
speed sensor displayed on the intelligent tester and the
speed value displayed on the speedometer are almost
the same when driving the vehicle.
OK:
The speed value output from the speed sensor
displayed on the intelligent tester is the same as
the actual vehicle speed.
NG
OK
(a) Clear the DTC (See page BC-10).
(b) Perform sensor signal check in TEST MODE
PROCEDURE (See page BC-3).
OK:
All Test Mode DTCs are erased.
OK
NG
(a) Turn the ignition switch off.
(b) Check the speed sensor installation.
OK:
The installation bolt is tightened properly.
There is no clearance between the sensor and the
front steering knuckle.
To r q u e :
8.0 N*m (82 kgf*cm, 71 in.*lbf)
NOTICE:
Check the speed sensor signal after replacement
(See page BC-3).
NG
OK
(a) Remove the front speed sensor (See page BC-187).
(b) Check the sensor tip.
WHEEL SPD FLWheel speed sensor (FL) reading
/ min.: 0 km/h (0 mph), max.: 326
km/h(202 mph)Actual wheel speedSimilar speed as indicated on
speedometer Item (Display)Measurement Item / Range
(Display)Normal Condition Diagnostic Note
Go to step 3
2PERFORM TEST MODE INSPECTION (SIGNAL CHECK)
Go to step 8
3INSPECT FRONT SPEED SENSOR INSTALLATION
BR03795E21
INSTALL FRONT SPEED SENSOR
CORRECTLY
4INSPECT SPEED SENSOR TIP
Page 2389 of 3000
BC–22BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEM
BC
OK:
No scratches or foreign matter on the sensor tip.
NOTICE:
Check the speed sensor signal after cleaning or
replacement (See page BC-3).
NG
OK
(a) Install the front speed sensor.
(b) Disconnect the front speed sensor connector.
(c) Measure the resistance according to the value(s) in the
table below.
Standard resistance:
RH
LH
NOTICE:
Check the speed sensor signal after replacement
(See page BC-3).
NG
OKREPLACE DRIVE SHAFT ASSEMBLY
5INSPECT FRONT SPEED SENSOR
C093876
Tester Connection Specified Condition
A4-1 (FR+) - A4-2 (FR-) 1.6+-0.2 k
at 20C
A4-1 (FR+) - Body ground 10 k
or higher
A4-2 (FR-) - Body ground 10 k
or higher
Tester Connection Specified Condition
A3-1 (FL+) - A3-2 (FL-) 1.6+-0.2 k
at 20C
A3-1 (FL+) - Body ground 10 k
or higher
A3-2 (FL-) - Body ground 10 k
or higher
REPLACE FRONT SPEED SENSOR
Page 2390 of 3000

BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEMBC–23
BC
(a) Disconnect the skid control sensor wire.
(b) Measure the resistance according to the value(s) in the
table below.
Standard resistance
RH:
LH:
NG
OK
(a) Connect the oscilloscope to terminals FR+ - FR- or FL+ -
FL- of the skid control ECU.
(b) Drive the vehicle at about 30 km/h(19 mph), and check
the signal waveform.
OK:
A waveform as shown in the figure should be
output.
HINT:
• As vehicle speed (wheel rotation speed) increases,
the width 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 rotor
scratches, looseness or foreign matter attached to the
speed sensor.
NG
6CHECK HARNESS AND CONNECTOR (BETWEEN SKID CONTROL ECU AND FRONT
SPEED SENSOR)
C161174E02
Tester Connection Specified Condition
S3-27 (FR+) - A4-1 (FR+) Below 1
S3-27 (FR+) - Body ground 10 k or higher
S3-28 (FR-) - A4-2 (FR-) Below 1
S3-28 (FR-) - Body ground 10 k or higher
Tester Connection Specified Condition
S3-13 (FL+) - A3-1 (FL+) Below 1
S3-13 (FL+) - Body ground 10 k or higher
S3-26 (FL-) - A3-2 (FL-) Below 1
S3-26 (FL-) - Body ground 10 k or higher
REPAIR OR REPLACE HARNESS OR
CONNECTOR
7INSPECT SPEED SENSOR AND SENSOR ROTOR SERRATIONS
W004200E03
Go to step 9
Page 2391 of 3000

BC–24BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEM
BC
OK
(a) Clear the DTCs (See page BC-10).
(b) Drive the vehicle at a speed of approximately 32 km/h
(20 mph) or more for 60 seconds or more.
(c) Check that the same DTCs are recorded (See page BC-
10).
HINT:
Reinstall the sensors, connectors, etc. and restore the
vehicle to its prior condition before rechecking for DTCs.
Result
B
C
A
(a) Turn the ignition switch off.
(b) Remove the front drive shaft (See page DS-5).
(c) Check the rotor.
OK:
No scratches, oil, or foreign matter on the rotors.
NOTICE:
Check the speed sensor signal after cleaning or
replacement (See page BC-3).
NG
OK
8RECONFIRM DTC
Condition Proceed to
DTCs (C0200/31, C0205/32, C1235/35 and C1236/36) are output A
DTCs (C0200/31, C0205/32, C1235/35 and C1236/36) are not
output (When troubleshooting in accordance with the DTC
CHART)B
DTCs (C0200/31, C0205/32, C1235/35 and C1236/36) are not
output (When troubleshooting in accordance with the PROBLEM
SYMPTOMS TABLE)C
END
PROCEED TO NEXT CIRCUIT INSPECTION
SHOWN IN PROBLEM SYMPTOMS TABLE
9INSPECT SPEED SENSOR ROTOR
R000948
CLEAN OR REPLACE DRIVE SHAFT
ASSEMBLY
REPLACE BRAKE ACTUATOR ASSEMBLY
Page 2392 of 3000

BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEMBC–31
BC
DESCRIPTION
The solenoid comes on when signals are received from the ECU and controls the pressure acting on the
wheel cylinders, thus controlling brake force.
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
These codes are detected when a problem is identified in the
brake actuator.
The solenoid circuit is in the brake actuator.
Therefore, solenoid circuit inspection and solenoid unit
inspection cannot be performed. Be sure to check if any DTC
is output before replacing the brake actuator assembly.
DTC C0226/21 SFR Solenoid Circuit
DTC C0236/22 SFL Solenoid Circuit
DTC C0246/23 SRR Solenoid Circuit
DTC C0256/24 SRL Solenoid Circuit
DTC No. DTC Detection Condition Trouble Area
C0226/21
When either of the following is detected:
• With IG1 terminal voltage at 10 V to 16 V, solenoid
circuit is an open or short for 0.05 seconds or more.
• With IG1 terminal voltage at 10 V to 16 V, during
ABS control solenoid relay contact is off for 0.05
seconds or more.• SFRH or SFRR circuit
• Brake actuator assembly
C0236/22• SFLH or SFLR circuit
• Brake actuator assembly
C0246/23• SRRH or SRRR circuit
• Brake actuator assembly
C0256/24• SRLH or SRLR circuit
• Brake actuator assembly
1RECONFIRM DTC
F045115E01