2007 TOYOTA SIENNA ECU

BRAKE CONTROL – VEHICLE STABILITY CONTROL SYSTEMBC–97
BC
RH
NOTICE:
Check the speed sensor signal after replacement
(See page BC-72).
NG
OK
(a) Disconnect the skid control ECU connector and the front
speed sensor connector.
(b) Measure the resistance according to the value(s) in the
table below.
Standard resistance:
LH
RH
(c) Measure the resistance according to the value(s) in the
table below.
Standard resistance:
LH
RH
NG
OK
A3-2 (FL-) - Body ground 10 k or higher
Tester Connection Specified Condition
A4-1 (FR+) - Body ground 10 k
or higher
A4-2 (FR-) - Body ground 10 k
or higher
REPLACE FRONT SPEED SENSOR
Tester Connection Specified Condition
4CHECK HARNESS AND CONNECTOR (FRONT SPEED SENSOR - SKID CONTROL ECU)
C136018E04
Tester Connection Specified Condition
S3-18 (FL+) - A3-1 (FL+) Below 1
S3-4 (FL-) - A3-2 (FL-) Below 1
Tester Connection Specified Condition
S3-3 (FR+) - A4-1 (FR+) Below 1
S3-17 (FR-) - A4-2 (FR-) Below 1
Tester Connection Specified Condition
S3-18 (FL+) - Body ground 10 k
or higher
S3-4 (FL-) - Body ground 10 k
or higher
Tester Connection Specified Condition
S3-3 (FR+) - Body ground 10 k
or higher
S3-17 (FR-) - Body ground 10 k
or higher
REPAIR OR REPLACE HARNESS OR
CONNECTOR

BC–98BRAKE CONTROL – VEHICLE STABILITY CONTROL SYSTEM
BC
(a) INSPECTION USING OSCILLOSCOPE
(1) Connect the oscilloscope to terminal FR+ and FR-
or FL+ and 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.
HINT:
• As the 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.
NOTICE:
When replacing the brake actuator assembly,
perform zero point calibration (See page BC-70).
NG
OK
(a) Check the speed sensor installation.
OK:
The installation bolt is tightened properly. There is
no clearance between the sensor and the front
steering knuckle.
Torque: 8.0 N*m (82 kgf*cm, 71 in.*lbf)
NOTICE:
Check the speed sensor signal after the replacement
(See page BC-72).
NG
OK
(a) Remove the front speed sensor (See page BC-187).
(b) Check the sensor tip.
5CHECK SPEED SENSOR AND SENSOR ROTOR SERRATIONS
W004200E18
Go to step 6
REPLACE BRAKE ACTUATOR ASSEMBLY
6CHECK FRONT SPEED SENSOR INSTALLATION
BR03795E45INSTALL FRONT SPEED SENSOR
CORRECTLY
7CHECK FRONT SPEED SENSOR TIP

BRAKE CONTROL – VEHICLE STABILITY CONTROL SYSTEMBC–101
BC
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 there is no difference between the speed
value output from the speed sensor displayed by the
intelligent tester 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
OK
(a) INSPECTION USING OSCILLOSCOPE:
(1) Connect the oscilloscope to terminals RR+ - RR- or
RL+ - RL- of the skid control ECU.
(2) Drive the vehicle at approximately 19 mph (30 km/
h), and check the signal waveform.
OK:
A waveform as shown in a figure should be
output.
HINT:
• As vehicle speed (wheel revolution speed) in
creases, a cycle of the waveform narrows and
the fluctuation in the output voltage becomes
greater.
• hen 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.
NOTICE:
When replacing the brake actuator assembly,
perform zero point calibration (See page BC-70).
NG
1READ VALUE ON INTELLIGENT TESTER (REAR SPEED SENSOR)
Tester Display Measurement Item/Range Normal Condition
WHEEL SPD RLWheel speed sensor (RL) reading / min.: 0
km/h (0 MPH, max.: 326 km/h (202 MPH)Actual wheel speed
WHEEL SPD RRWheel speed sensor (RR) reading / min.: 0
km/h (0 MPH, max.: 326 km/h (202 MPH)Actual wheel speed
Go to step 3
2CHECK SPEED SENSOR AND SENSOR ROTOR SERRATIONS
W004200E19
Go to step 6

BRAKE CONTROL – VEHICLE STABILITY CONTROL SYSTEMBC–103
BC
Standard resistance:
LH
RH
NOTICE:
Check the speed sensor signal after the
replacement. (See page BC-72)
NG
OK
(a) Disconnect the skid control ECU connector and the skid
control sensor connector.
(b) Measure the resistance according to the value(s) in the
table below.
Standard resistance:
LH
RH
(c) Measure the resistance according to the value(s) in the
table below.
Standard resistance:
LH
RH
NG
Tester Connection Specified Condition
A27-1 (RL+) - Body ground 1 M
or higher
A27-2 (RL-) - Body ground 1 M
or higher
Tester Connection Specified Condition
A28-1 (RR+) - Body ground 1 M
or higher
A28-2 (RR-) - Body ground 1 M
or higher
REPLACE REAR SPEED SENSOR
4CHECK HARNESS AND CONNECTOR (REAR SPEED SENSOR - SKID CONTROL ECU)
C119433E03
Tester Connection Specified Condition
S3-20 (RL+) - A27-1 (RL+) Below 1
S3-6 (RL-) - A27-2 (RL-) Below 1
Tester Connection Specified Condition
S3-5 (RR+) - A28-1 (RR+) Below 1
S3-19 (RR-) - A28-2 (RR-) Below 1
Tester Connection Specified Condition
S3-20 (RL+) - Body ground 10 k
or higher
S3-6 (RL-) - Body ground 10 k
or higher
Tester Connection Specified Condition
S3-5 (RR+) - Body ground 10 k
or higher
S3-19 (RR-) - Body ground 10 k
or higher
REPAIR OR REPLACE HARNESS OR
CONNECTOR

BC–104BRAKE CONTROL – VEHICLE STABILITY CONTROL SYSTEM
BC
OK
(a) INSPECTION USING OSCILLOSCOPE:
(1) Connect the oscilloscope to terminals RR+ - RR- or
RL+ - RL- of the skid control ECU.
(2) Drive the vehicle at approximately 19 mph (30 km/
h), and check the signal waveform.
OK:
A waveform as shown in a figure should be
output.
HINT:
• As the 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.
NOTICE:
When replacing the brake actuator assembly,
perform zero point calibration (See page BC-70).
NG
OK
(a) 2WD
(1) Check the sensor installation.
OK:
There is no clearance between the sensor and
rear axle carrier.
5CHECK SPEED SENSOR AND SENSOR ROTOR SERRATIONS
W004200E20
Go to step 6
REPLACE BRAKE ACTUATOR ASSEMBLY
6CHECK REAR SPEED SENSOR INSTALLATION
F010178E14

BRAKE CONTROL – VEHICLE STABILITY CONTROL SYSTEMBC–107
BC
DESCRIPTION
This solenoid goes on when signals are received from the ECU and controls the pressure acting on the
wheel cylinders to control the braking force.
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
This code is detected when a problem is determined in the
brake actuator assembly.
The solenoid circuit is in the brake actuator assembly.
Therefore, solenoid circuit inspection and solenoid unit
inspection cannot be performed. Be sure to check if the DTC
code 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 Code DTC Detection Condition Trouble Area
C0226/21Open or short circuit in front right solenoid circuit
(SFRR or SFRH) continues for 0.05 sec. or more.• Brake actuator assembly
• Each solenoid circuit
C0236/22Open or short circuit in front left solenoid circuit (SFLR
or SFLH) continues for 0.05 sec. or more.• Brake actuator assembly
• Each solenoid circuit
C0246/23Open or short circuit in rear right solenoid circuit (SRRR
or SRRH) continues for 0.05 sec. or more.• Brake actuator assembly
• Each solenoid circuit
C0256/24Open or short circuit in rear left solenoid circuit (SRLR
or SRLH) continues for 0.05 sec. or more.• Brake actuator assembly
• Each solenoid circuit
1RECONFIRM DTC
F045115E02

BRAKE CONTROL – VEHICLE STABILITY CONTROL SYSTEMBC–109
BC
DESCRIPTION
The ABS motor relay supplies power to the ABS pump motor. While the ABS & TRAC & VSC are
activated, the ECU switches the ABS motor relay ON and operates the ABS pump motor.
DTC C0273/13Open or Short Circuit in ABS Motor Relay Cir-
cuit
DTC C0274/14 Short to B+ in ABS Motor Relay Circuit
DTC C1361/91Short Circuit in ABS Motor Fail Safe Relay Cir-
cuit
DTC Code DTC Detection Condition Trouble Area
C0273/13When either of the following is detected:
1. All of the following conditions continue for 0.12 sec.
or more.
– The IG1 terminal voltage is between 9.5 and
18.5 V.
– During initial check and ABS, BA, TRAC, or
VSC are operating.
– Relay contact is open when the relay is ON.
2. Both of the following conditions continue for 0.12
sec.
– The IG1 terminal voltage is 9.5 V or less.
– Relay contact remains open when the relay is
ON.• ABS 1 fuse
• VSC MTR relay
• VSC MTR relay circuit
C0274/14When pump motor relay is turned off, relay contact is
"ON" for 4 sec. or more.• ABS 1 fuse
• VSC MTR relay
• VSC MTR relay circuit
C1361/91Immediately after IG1 terminal is turned ON, when
pump motor fail safe relay is tuned OFF, the relay
contact is "ON" for 4 sec. or more.• ABS 1 fuse
• VSC FAIL relay
• VSC FAIL relay circuit

BC–112BRAKE CONTROL – VEHICLE STABILITY CONTROL SYSTEM
BC
OK
(a) Check for open or short circuit in harness and connector
between the ABS motor relay and skid control ECU.
NG
OK
(a) Clear the DTCs.
(b) Drive the vehicle at a speed of 6 km/h (4 mph) or more.
(c) Check if the same DTCs are recorded (See page BC-
82).
Result
HINT:
• The skid control ECU inspects the motor relay circuit
when the stop light switch is turned off and the vehicle
is running at a speed of 6 km/h (4mph) or more.
• It is suspect that the DTCs output was caused by the
poor connection of the connector terminal.
B
A
(a) Remove the ABS 1 fuse from the FL block.
(b) Measure the resistance according to the value(s) in the
table below.
Standard resistance
NG
OK
4CHECK HARNESS AND CONNECTOR (ABS MOTOR RELAY - SKID CONTROL ECU)
REPAIR OR REPLACE HARNESS OR
CONNECTOR
5RECONFIRM DTC
Result Proceed to
DTC is outputA
DTC is not outputB
PROCEED TO NEXT CIRCUIT INSPECTION
SHOWN IN PROBLEM SYMPTOMS TABLE
REPLACE BRAKE ACTUATOR ASSEMBLY
6INSPECT ABS 1 FUSE
Tester Connection Specified Condition
ABS 1 fuse Below 1
REPLACE ABS 1 FUSE