brake sensor TOYOTA SIENNA 2007 Service Manual Online

BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEMBC–29
BC
(a) Disconnect the skid control ECU connector.
(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 REAR
SPEED SENSOR)
C119427E03
Tester Connection Specified Condition
S3-5 (RR+) - A28-1 (RR+) Below 1
S3-5 (RR+) - Body ground 10 k or higher
S3-4 (RR-) - A28-2 (RR-) Below 1
S3-4 (RR-) - Body ground 10 k or higher
Tester Connection Specified Condition
S3-7 (RL+) - A27-1 (RL+) Below 1
S3-7 (RL+) - Body ground 10 k or higher
S3-6 (RL-) - A27-2 (RL-) Below 1
S3-6 (RL-) - Body ground 10 k or higher
REPAIR OR REPLACE HARNESS OR
CONNECTOR
7INSPECT SPEED SENSOR AND SENSOR ROTOR SERRATIONS
W004200E03
Go to step 9

BC–30BRAKE 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 rear axle hub and bearing (See page AH-
16).
(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 (C0210/33, C0215/34, C1238/38 and C1239/39) are output A
DTCs (C0210/33, C0215/34, C1238/38 and C1239/39) are not
output (When troubleshooting in accordance with the DTC
CHART)B
DTCs (C0210/33, C0215/34, C1238/38 and C1239/39) 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
W004846E02
CLEAN OR REPLACE REAR AXLE HUB AND
BEARING ASSEMBLY
REPLACE BRAKE ACTUATOR ASSEMBLY

BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEMBC–9
BC
PROBLEM SYMPTOMS TABLE
If there are no DTCs output but the problem still occurs,
check the circuits for each problem symptom in the order
given in the table below and proceed to the relevant
troubleshooting page.
NOTICE:
When replacing the brake actuator assembly, sensor,
etc., turn the ignition switch off.
HINT:
Inspect the fuse and relay before investigating the suspected
areas as shown in the table below. Inspect each malfunction
circuit in numerical order for the corresponding symptom.
Anti-lock brake system:
Symptom Suspected Area See page
ABS does not operate1. Check the DTC again and make sure that the normal
system code is output.BC-10
2. IG power source circuitBC-37
3. Front speed sensor circuitBC-17
4. Rear speed sensor circuitBC-23
5. Check the brake actuator with the intelligent tester. If
abnormal, check the hydraulic circuit for leakage.BC-183
6. If the symptoms still occur even after the above circuits in
suspected areas have been inspected and proved to be
normal, replace the brake actuator assembly.BC-184
ABS does not operate efficiently1. Check the DTC again and make sure that the normal
system code is output.BC-10
2. Front speed sensor circuitBC-17
3. Rear speed sensor circuitBC-23
4. Stop light switch circuitBC-41
5. Check the brake actuator with intelligent tester. If abnormal,
check that hydraulic circuit for leakage.BC-183
6. If the symptoms still occur even after the above circuits in
suspected areas have been inspected and proved to be
normal, replace the brake actuator assembly.BC-184
ABS warning light abnormal (Remains on)1. ABS warning light circuitBC-47
2. Brake actuator assemblyBC-184
ABS warning light abnormal (Does not come on)1. ABS warning light circuitBC-50
2. Brake actuator assemblyBC-184
BRAKE warning light abnormal (Remains on)1. BRAKE warning light circuitBC-52
2. Brake actuator assemblyBC-184
BRAKE warning light abnormal (Does not come on)1. BRAKE warning light circuitBC-59
2. Brake actuator assemblyBC-184
DTC check cannot be done1. Check the DTC again and make sure that the normal
system code is output.BC-10
2. TC and CG terminal circuitBC-61
3. If the symptoms still occur even after the above circuits in
suspected areas have been inspected and proved to be
normal, replace the brake actuator assembly.BC-184
Test mode (Signal check) cannot be done1. TS and CG terminal circuitBC-64
2. Brake actuator assemblyBC-184

BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEMBC–17
BC
DIAGNOSTIC TROUBLE CODE CHART
HINT:
• If a trouble code is displayed during the DTC check, check
the circuit indicated by the DTC. For details of each code,
turn to the page for the respective DTC Code. in the DTC
chart.
• Inspect the fuse and relay before investigating the trouble
areas as shown in the table below.
DTC chart of ABS:
DTC Code Detection Item Trouble Area See page
C0200/31 Front Speed Sensor RH Circuit1. Front speed sensor RH
2. Front speed sensor RH circuit
3. Speed sensor rotor
4. Sensor installation
5. Brake actuator assemblyBC-17
C0205/32 Front Speed Sensor LH Circuit1. Front speed sensor LH
2. Front speed sensor LH circuit
3. Speed sensor rotor
4. Sensor installation
5. Brake actuator assemblyBC-17
C0210/33 Rear Speed Sensor RH Circuit1. Rear speed sensor RH
2. Rear speed sensor RH circuit
3. Speed sensor rotor
4. Sensor installation
5. Brake actuator assemblyBC-23
C0215/34 Rear Speed Sensor LH Circuit1. Rear speed sensor LH
2. Rear speed sensor LH circuit
3. Speed sensor rotor
4. Sensor installation
5. Brake actuator assemblyBC-23
C0226/21 SFR Solenoid Circuit1. SFRH or SFRR circuit
2. Brake actuator assemblyBC-29
C0236/22 SFL Solenoid Circuit1. SFLH or SFLR circuit
2. Brake actuator assemblyBC-29
C0246/23 SRR Solenoid Circuit1. SRRH or SRRR circuit
2. Brake actuator assemblyBC-29
C0256/24 SRL Solenoid Circuit1. SRLH or SRLR circuit
2. Brake actuator assemblyBC-29
C0273/13 Open in ABS Motor Relay Circuit1. ABS 1 fuse
2. ABS motor relay
3. ABS motor relay circuit
4. Brake actuator assemblyBC-31
C0274/14Short to B+ in ABS Motor Relay
Circuit1. ABS 1 fuse
2. ABS motor relay
3. ABS motor relay circuit
4. Brake actuator assemblyBC-31
C0278/11Open in ABS Solenoid Relay
Circuit1. ABS 2 fuse
2. ABS solenoid relay
3. ABS solenoid relay circuit
4. Brake actuator assemblyBC-34
C0279/12Short to B+ in ABS Solenoid
Relay Circuit1. ABS 2 fuse
2. ABS solenoid relay
3. ABS solenoid relay circuit
4. Brake actuator assemblyBC-34
C1235/35Foreign Object is Attached on Tip
of Front Speed Sensor RH1. Front speed sensor RH
2. Speed sensor rotor
3. Sensor installation
4. Brake actuator assemblyBC-17

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

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

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

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

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

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