brake sensor TOYOTA SIENNA 2007 Service Repair Manual

BC–120BRAKE CONTROL – VEHICLE STABILITY CONTROL SYSTEM
BC
INSPECTION PROCEDURE
HINT:
When U0073/94, U0100/65, U0123/62, U0124/95 or U0126/63 are output accompanied with C1210/36 or
C1336/39, inspect and repair the trouble areas indicated by U0073/94, U0100/65, U0123/62, U0124/95 or
U0126/63 first.
(a) Perform the zero point calibration of the yaw rate and
deceleration sensor (See page BC-70).
NEXT
(a) Clear the DTCs (See page BC-82).
(b) Turn the ignition switch to the ON position.
(c) Are the same DTCs recorded (See page BC-82).
Result
B
A
(a) Check that the yaw rate and deceleration sensor has
been installed properly (See page BC-197).
NOTICE:
When replacing the yaw rate and deceleration
sensor, perform zero point calibration (See page BC-
70).
NG
OK
1PERFORM ZERO POINT CALIBRATION OF YAW RATE AND DECELERATION SENSOR
2RECONFIRM DTC
Result Proceed to
DTC is outputA
DTC is not outputB
PROCEED TO NEXT CIRCUIT INSPECTION
SHOWN IN PROBLEM SYMPTOMS TABLE
3CHECK YAW RATE AND DECELERATION SENSOR INSTALLATION
INSTALL YAW RATE AND DECELERATION
SENSOR CORRECTLY
REPLACE YAW RATE AND DECELERATION SENSOR

BC–122BRAKE CONTROL – VEHICLE STABILITY CONTROL SYSTEM
BC
DESCRIPTION
The steering angle sensor signal is sent to the skid control ECU through the CAN communication system.
When there is a malfunction in the communication, it will be detected by the diagnosis function.
DTC C1231/31 Steering Angle Sensor Circuit Malfunction
DTC Code DTC Detection Condition Trouble Area
C1231/31When ECU IG1 terminal voltage is 9.5 V or more, the
steering angle sensor malfunction signal is received.• Steering angle sensor
• Steering angle sensor circuit
•+B circuit

BC–124BRAKE CONTROL – VEHICLE STABILITY CONTROL SYSTEM
BC
• When the speed sensor or the yaw rate sensor has trouble. DTCs for the steering angle sensor may be
output even when the steering angle sensor is normal. When DTCs for the speed sensor or yaw rate
sensor are output accompanied with other DTCs for the steering angle sensor, inspect and repair the
speed sensor and yaw rate sensor first, and the n inspect and repair the steering angle sensor.
(a) Remove the steering wheel and the column lower cover.
(b) Disconnect the steering angle sensor connector.
(c) Turn the ignition switch to the ON position.
(d) Measure the voltage according to the value(s) in the
table below.
Standard voltage
(e) Measure the voltage according to the value(s) in the
table below.
Standard voltage
NG
OK
1INSPECT STEERING ANGLE SENSOR
G026292E09
Tester Connection Specified Condition
S9-1 (IG1) - S9-2 (ESS) 10 to 14 V
Tester Connection Specified Condition
S9-3 (BAT) - S9-2 (ESS) 10 to 14 V
REPAIR OR REPLACE HARNESS OR
CONNECTOR
REPLACE STEERING ANGLE SENSOR

BRAKE CONTROL – VEHICLE STABILITY CONTROL SYSTEMBC–125
BC
DESCRIPTION
The yaw rate sensor and deceleration sensor signal is sent to the skid control ECU through the CAN
communication system. When there is a malfunction in the communication, it will be detected by the
diagnosis function.
DTC C1232/32 Stuck in Deceleration Sensor
DTC C1234/34 Yaw Rate Sensor Malfunction
DTC C1243/43 Acceleration Sensor Stuck Malfunction
DTC C1244/44 Open or Short in Deceleration Sensor Circuit
DTC C1245/45 Acceleration Sensor Output Malfunction
DTC C1381/97Yaw Rate and / or Acceleration Sensor Power
Supply Voltage Malfunction
DTC Code DTC Detection Condition Trouble Area
C1232/32At a vehicle speed of 10 km/h (6 mph) or more, either
GL1 or GL2 (input signal) does not change for 30 sec.
or more.Yaw rate and deceleration sensor
C1234/34 The yaw rate sensor malfunction signal is received Yaw rate and deceleration sensor
C1243/43While vehicle speed becomes 0 km/h (0 mph) from 30
km/h (18 mph) or more, the condition that both GL1 and
GL2 signals of ECU terminals do not change 2 LSB or
more continued in a sequence 16 times.• Yaw rate and deceleration sensor
• Yaw rate and deceleration sensor circuit
C1244/44When either of the following is detected:
1. With vehicle speed at 0 km/h, after the difference of
output absolute value of G conversion value
between deceleration sensor terminals GL1 and
GL2 becomes 0.6 G or more, and the condition that
does not become 0.4 G continues for 60 sec. or
more.
2. Deceleration sensor malfunction signal is received.• Yaw rate and deceleration sensor
• Yaw rate and deceleration sensor circuit
C1245/45At the vehicle speed of 30 km/h (18 mph) or more, the
acceleration and deceleration values calculated from
the deceleration sensor values and from vehicle speed
are different, and the condition that the difference
exceeds 0.35 G continues for 60 sec. or more.• Yaw rate and deceleration sensor
• Yaw rate and deceleration sensor circuit
C1381/97With vehicle speed at 3 km/h or more, malfunction
signal of deceleration sensor terminal IG1 is received
for 10 sec. or more.• Yaw rate and deceleration sensor
• Yaw rate and deceleration sensor power source
circuit

BC–126BRAKE CONTROL – VEHICLE STABILITY CONTROL SYSTEM
BC
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
When U0073/94, U0100/65, U0123/62, U0124/95 or U0126/63 are output accompanied with C1232/32,
C1234/34, C1243/43, C1244/44, C1245/45 or C1381/97, inspect and repair the trouble areas indicated by
U0073/94, U0100/65, U0123/62, U0124/95 or U0126/63 first.
(a) Check that the yaw rate and deceleration sensor has
been installed properly (See page BC-197).
OK:
The sensor should be tightened to the specified
torque.
The sensor should not be tilted.
NG
OK
(a) Disconnect the yaw rate and deceleration sensor
connector.
1CHECK YAW RATE AND DECELERATION SENSOR INSTALLATION
C132917E08
INSTALL YAW RATE AND DECELERATION
SENSOR CORRECTLY
2INSPECT YAW RATE AND DECELERATION SENSOR (IG TERMINAL)

BRAKE CONTROL – VEHICLE STABILITY CONTROL SYSTEMBC–127
BC
(b) Turn the ignition switch to the ON position.
(c) Measure the voltage according to the value(s) in the
table below.
Standard voltage
NG
OK
(a) Disconnect the yaw rate and deceleration sensor
connector.
(b) Measure the resistance according to the value(s) in the
table below.
Standard resistance
NG
OK
F045082E08
Tester Connection Specified Condition
Y1-5 (IG) - Body ground 10 to 14 V
REPAIR OR REPLACE HARNESS OR
CONNECTOR (IG CIRCUIT)
3INSPECT YAW RATE AND DECELERATION SENSOR (GND TERMINAL)
F045082E09
Tester Connection Specified Condition
Y1-1 (GND) - Body ground Below 1
REPAIR OR REPLACE HARNESS OR
CONNECTOR (GND CIRCUIT)
REPLACE YAW RATE AND DECELERATION SENSOR

BRAKE CONTROL – VEHICLE STABILITY CONTROL SYSTEMBC–131
BC
DESCRIPTION
Master cylinder pressure sensor is connected to the skid control ECU in the actuator.
INSPECTION PROCEDURE
(a) Connect the intelligent tester to the DLC3.
(b) Start the engine.
(c) Select the DATA LIST mode on the intelligent tester.
ABS / VSC:
(d) Check that the brake fluid pressure value of the master
cylinder pressure sensor indicated on the intelligent
tester, changes when the brake pedal is depressed.
OK:
Brake fluid pressure value should change.
NOTICE:
When replacing the brake actuator assembly,
perform zero point calibration (See page BC-70).
NG
OK
DTC C1246/46 Master Cylinder Pressure Sensor Malfunction
DTC Code DTC Detection Condition Trouble Area
C1246/46When any of the following is detected:
1. When the vehicle speed is 7 km/h (4 mph) or more
and PMC terminal voltage of skid control ECU
exceeds 0.86 V, the condition that the voltage does
not change by 0.005 V or more continues for 30
sec.
2. Noise in terminal PMC of skid control ECU occurs 7
times or more within 5 sec.
3. When the stop light switch is off, the condition that
PMC terminal voltage of skid control ECU is 0.86 V
or more, or less than 0.3 V continues for 5 sec. or
more.
4. When IG1 terminal voltage is between 9.5 and 17.2
V, the condition that the VCM terminal voltage of
skid control ECU is out of the range from 4.4 to 5.6
V continues for 1.2 sec. or more.
5. When VCM terminal voltage of skid control ECU is
between 4.4 and 5.6 V, the condition that the PMC
terminal voltage of skid control ECU is out of the
range from 0.14 to 4.85 V continues for 1.2 sec. or
more.• Master cylinder pressure sensor
• Master cylinder pressure sensor circuit
1READ VALUE ON INTELLIGENT TESTER (MASTER CYLINDER PRESSURE SENSOR)
Tester Display Measurement Item/Range Normal Condition
MAS CYL PRS 1Master cylinder pressure sensor 1 reading /
min.: 0 V, max.: 5 VWhen brake pedal is released : 0.3 to 0.9 V
Go to step 2
REPLACE BRAKE ACTUATOR ASSEMBLY

BC–140BRAKE CONTROL – VEHICLE STABILITY CONTROL SYSTEM
BC
DESCRIPTION
The skid control ECU acquires steering angle sensor zero point every time the ignition switch is turned to
the ON position and the vehicle is driven at 35 km/h (22 mph) or more for approximately 5 seconds. The
ECU also stores the previous zero point.
If front wheel alignment or steering wheel position is adjusted without disconnecting the negative battery
terminal, or if yaw rate and deceleration sensor zero point is not acquired after the adjustments have been
completed, the skid control ECU detects the difference between the previous zero point and newly
acquired zero point and outputs this DTC to indicate a poor adjustment.
Warning of the steering angle sensor zero point malfunction will be cancelled by turning the ignition switch
off.
INSPECTION PROCEDURE
NOTICE:
When replacing the brake actuator assembly, perform zero point calibration (See page BC-70).
(a) Perform zero point calibration of the yaw rate and
deceleration sensor (See page BC-70).
HINT:
• When the stored zero point of the yaw rate and
deceleration sensor is erased, steering angle sensor
zero point will also be erased.
• If the zero point and output value of the yaw rate and
deceleration sensor and the output value of the speed
sensors are not normal, steering angle sensor zero
point cannot be acquired normally even if the vehicle
is driven straight ahead at 35 km/h (22 mph) or more.
NEXT
(a) Drive the vehicle straight ahead at 35 km/h (22 mph) or
more for at least 5 seconds.
(b) Check that the centered position of the steering wheel is
correctly set while driving straight ahead.
HINT:
If front wheel alignment and steering position are
adjusted as a result of abnormal centered position of the
steering wheel, acquire yaw rate and deceleration
sensor zero point again after the adjustments are
completed.
DTC C1290/66 Steering Angle Sensor Zero Point Malfunction
DTC Code DTC Detection Condition Trouble Area
C1290/66The steering angle sensor zero point calibration position
vastly differs from the recorded value• Yaw rate and deceleration sensor zero point
calibration incomplete
• Poor adjustment of the centered position of the
steering wheel
• Poor adjustment of front wheel alignment
1PERFORM ZERO POINT CALIBRATION OF YAW RATE AND DECELERATION SENSOR
2CHECK STEERING ANGLE SENSOR ZERO POINT CALIBRATION

BC–142BRAKE CONTROL – VEHICLE STABILITY CONTROL SYSTEM
BC
INSPECTION PROCEDURE
Refer to CAN communication system (See page CA-7).
DTC U0073/94 Control Module Communication Bus OFF
DTC U0100/65 Lost Communication with ECM / PCM
DTC U0123/62Lost Communication with Yaw Rate Sensor
Module
DTC U0124/95Lost Communication with Lateral Acceleration
Sensor Module
DTC U0126/63Lost Communication with Steering Angle Sen-
sor Module

BRAKE CONTROL – VEHICLE STABILITY CONTROL SYSTEMBC–177
BC
DESCRIPTION
In the sensor check mode, a malfunction of the speed sensor that cannot be detected when the vehicle is
stopped is detected while driving.
Transition to the sensor check mode can be performed by connecting terminals TS and CG of the DLC3
and turning the ignition switch from off to the ON position.
WIRING DIAGRAM
INSPECTION PROCEDURE
(a) Turn the ignition switch to the ON position.
(b) Measure the voltage according to the value(s) in the
table below.
Standard voltage
NG
OK
(a) Disconnect the skid control ECU connector.
TS and CG Terminal Circuit
1INSPECT DLC3
F045121E03
E106867E20
Tester Connection Specified Condition
D1-12 (TS) - D1-4 (CG) 10 to 14 V
REPAIR OR REPLACE HARNESS OR
CONNECTOR
2CHECK HARNESS AND CONNECTOR (TS of DLC3 - SKID CONTROL ECU)