2007 TOYOTA SIENNA ECU

BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEMBC–63
BC
DESCRIPTION
DTC output mode is set by connecting terminals TC and CG of the DLC3.
The DTCs are displayed by the blinking pattern of the ABS warning light.
WIRING DIAGRAM
HINT:
When warning lights continue to blink, a ground short in the wiring of terminal TC of the DLC3 or an
internal ground short in one or more ECU is suspected.
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
TC and CG Terminal Circuit
1INSPECT DLC3 (BETWEEN TC of DLC3 AND CG of DLC3)
C114571E09
E106867E21
Tester Connection Specified Condition
D1-13 (TC) - D1-4 (CG) 10 to 14 V
Go to step 3

BC–64BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEM
BC
(a) Turn the ignition switch off.
(b) Disconnect the skid control ECU connector.
(c) Measure the resistance according to the value(s) in the
table below.
Standard resistance
NG
OK
(a) Turn the ignition switch off.
(b) Measure the resistance according to the value(s) in the
table below.
Standard resistance
NG
OK
2CHECK HARNESS AND CONNECTOR (BETWEEN SKID CONTROL ECU AND TC of DLC3)
C127347E05
Tester Connection Specified Condition
S3-8 (TC) - D1-13 (TC) Below 1
S3-8 (TC) - Body ground 10 k or higher
REPAIR OR REPLACE HARNESS OR
CONNECTOR
REPLACE BRAKE ACTUATOR ASSEMBLY
3CHECK HARNESS AND CONNECTOR (BETWEEN CG of DLC3 AND BODY GROUND)
E106867E27
Tester Connection Specified Condition
D1-4 (CG) - Body ground Below 1
REPAIR OR REPLACE HARNESS OR
CONNECTOR

BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEMBC–65
BC
(a) Disconnect the skid control ECU connector.
(b) Measure the resistance according to the value(s) in the
table below.
Standard resistance
NG
OK
4CHECK HARNESS AND CONNECTOR (BETWEEN SKID CONTROL ECU AND TC of DLC3)
C127347E06
Tester Connection Specified Condition
S3-8 (TC) - D1-13 (TC) Below 1
S3-8 (TC) - Body ground 10 k or higher
REPAIR OR REPLACE HARNESS OR
CONNECTOR
REPLACE BRAKE ACTUATOR ASSEMBLY

BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEMBC–67
BC
INSPECTION PROCEDURE
(a) Turn the ignition switch off.
(b) Disconnect the skid control ECU connector.
(c) Measure the resistance according to the value(s) in the
table below.
Standard resistance
NG
OK
(a) Measure the resistance according to the value(s) in the
table below.
Standard resistance
NG
OK
1CHECK HARNESS AND CONNECTOR (BETWEEN SKID CONTROL ECU AND TS of DLC3)
C127347E07
Tester Connection Specified Condition
S3-10 (TS) - D1-12 (TS) Below 1
REPAIR OR REPLACE HARNESS OR
CONNECTOR
2CHECK HARNESS AND CONNECTOR (BETWEEN CG of DLC3 AND BODY GROUND)
E106867E28
Tester Connection Specified Condition
D1-4 (CG) - Body ground Below 1
REPAIR OR REPLACE HARNESS OR
CONNECTOR

BC–14BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEM
BC
FREEZE FRAME DATA
1. FREEZE FRAME DATA
(a) Whenever a DTC is detected or the ABS operates,
the skid control ECU stores the current vehicle
(sensor) state as freeze frame data.
The skid control ECU stores the number of times
(maximum: 31) the ignition switch has been turned
from OFF to the ON position since the last time the
ABS was activated.
HINT:
• Freeze frame data at the time the ABS operates:
The skid control ECU stores and updates data
whenever the ABS system operates.
When the ECU stores data at the time a DTC is
detected, the data stored during ABS operation is
erased.
(b) Connect the intelligent tester to the DLC3.
(c) Turn the ignition switch to the ON position.
(d) On the tester display, select the FREEZE FRAME
DATA.
Intelligent Tester Display Measurement Item Reference Value
VEHICLE SPD Vehicle speed readingMin.: 0 mph (0 km/h), Max.: 202 mph (326.4
km/h)
STOP LIGHT SW Stop light switch signal Stop light switch ON: ON, OFF: OFF
# IG ONNumber of operations of ignition switch ON
after memorizing freeze frame data0 to 31
SYSTEM System statusABS activated: ABS
No system activated: NO SYS

BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEMBC–15
BC
DATA LIST / ACTIVE TEST
1. DATA LIST
(a) While the intelligent tester is connected to the DLC3
with the ignition switch in the ON position, the ABS
data list can be displayed. Follow the prompts on
the tester screen to access the DATA LIST.
Tester Display Measurement Item/Range Normal Condition Diagnostic Note
ABS MOT RELAY ABS motor relay / ON or OFFON: During pump motor
operation
OFF: No pump motor operation-
SOL RELAY Solenoid relay / ON or OFFON: Solenoid relay ON
OFF: Solenoid relay OFF-
STOP LIGHT SW Stop light switch / ON or OFFON: Brake pedal depressed
OFF: Brake pedal released-
PKB SW Parking brake switch / ON or OFFON: Parking brake applied
OFF: Parking brake released-
ABS OPERT FRABS operation (FR) / BEFORE or
OPERATEBEFORE: No ABS operation (FR)
OPERATE: During ABS operation
(FR)-
ABS OPERT FLABS operation (FL) / BEFORE or
OPERATEBEFORE: No ABS operation (FL)
OPERATE: During ABS operation
(FL)-
ABS OPERT RRABS operation (RR) / BEFORE or
OPERATEBEFORE: No ABS operation
(RR)
OPERATE: During ABS operation
(RR)-
ABS OPERT RLABS operation (RL ) / BEFORE or
OPERATEBEFORE: No ABS operation (RL)
OPERATE: During ABS operation
(RL)-
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
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
WHEEL SPD RRWheel speed sensor (RR)
reading / min.: 0 km/h (0 mph),
max.: 326 km/h (202 mph)Actual wheel speedSimilar speed as indicated on
speedometer
WHEEL SPD RLWheel speed sensor (RL) reading
/ min.: 0 km/h (0 mph), max.: 326
km/h (202 mph)Actual wheel speedSimilar speed as indicated on
speedometer
IG VOLTAGEECU IG Power supply voltage /
TOO LOW/NORMALTOO LOW: 9.5 V or less
NORMAL: 9.5 to 14.0 V-
SFRRABS solenoid (SFRR) / ON or
OFFON: Operates -
SFRHABS solenoid (SFRH) / ON or
OFFON: Operates -
SFLRABS solenoid (SFLR) / ON or
OFFON: Operates -
SFLHABS solenoid (SFLH) / ON or
OFFON: Operates -
SRRRABS solenoid (SRRR) / ON or
OFFON: Operates -
SRRHABS solenoid (SRRH) / ON or
OFFON: Operates -
SRLRABS solenoid (SRLR) / ON or
OFFON: Operates -
SRLHABS solenoid (SRLH) / ON or
OFFON: Operates -

BRAKE CONTROL – VEHICLE STABILITY CONTROL SYSTEMBC–73
BC
TEST MODE PROCEDURE
1. WARNING LIGHT AND INDICATOR LIGHT BULB
CHECK
(a) Check the warning lights.
(1) Release parking brake pedal.
(2) When the ignition switch is turned to the ON
position, check that the ABS warning light,
BRAKE warning light, VSC warning light, TRAC
OFF indicator light (2WD) and SLIP indicator
light stay on for approx. 3 seconds.
HINT:
• When the parking brake is applied or the level
of brake fluid is low, the BRAKE warning light
comes on.
• If the ECU has any stored DTCs, the ABS
warning light, VSC warning light and TRAC
OFF indicator light (2WD) comes on.
• If the indicator does not come on, inspect it
the bulb is blown out, and also the wire
harness between the skid control ECU and
the combination meter.
• If the indicator remains on, proceed to
troubleshooting for the light circuit below.
2. SENSOR SIGNAL CHECK BY TEST MODE (SIGNAL
CHECK) (WHEN USING INTELLIGENT TESTER):
(a) When having replaced the skid control ECU and/or
yaw rate and deceleration sensor, perform zero
point calibration of the yaw rate and deceleration
sensor.
HINT:
• If the ignition switch is turned from the ON
position to the ACC or off during test mode
(signal check), DTCs of the signal check function
will be erased.
• During test mode (signal check), the skid control
ECU records all DTCs of the signal check
function. By performing the test mode (signal
check), the codes are erased if normality is
confirmed. The remaining codes are the codes
where an abnormality was found.
F045096E07
Trouble Area See procedure
ABS warning light circuitBC-141 or BC-145
VSC warning light circuitBC-147 or BC-150
BRAKE warning light circuitBC-152
TRAC OFF indicator light circuit (2WD)BC-157 or BC-162
SLIP indicator light circuitBC-164 or BC-167

BC–76BRAKE CONTROL – VEHICLE STABILITY CONTROL SYSTEM
BC
VSC sensor:
HINT:
The codes in this table are output only in Test Mode
(signal check).
7. SENSOR SIGNAL CHECK BY TEST MODE (SIGNAL
CHECK) (WHEN USING SST CHECK WIRE):
(a) When having replaced the skid control ECU and/or
yaw rate and deceleration sensor, perform zero
point calibration of the yaw rate and deceleration
sensor.
HINT:
• If the ignition switch is turned from the ON
position to the ACC or off during test mode
(signal check), DTCs of the signal check function
will be erased.
• During test mode (signal check), the skid control
ECU records all DTCs of the signal check
function. By performing the test mode (signal
check), the codes are erased if normality is
confirmed. The remaining codes are the codes
where an abnormality was found.
(b) Procedures for test mode.
(1) Turn the ignition switch off.
(2) Check that the steering wheel is in the
straightahead position and move the shift lever
to the P position.
C1273/73 Low output signal of rear speed sensor RH• Rear speed sensor RH
• Sensor installation
• Speed sensor rotor
C1274/74 Low output signal of rear speed sensor LH• Rear speed sensor LH
• Sensor installation
• Speed sensor rotor
C1275/75Abnormal change in output signal of front speed sensor
RHSpeed sensor rotor
C1276/76Abnormal change in output signal of front speed sensor
LHSpeed sensor rotor
C1277/77Abnormal change in output signal of rear speed sensor
RHSpeed sensor rotor
C1278/78Abnormal change in output signal of rear speed sensor
LHSpeed sensor rotor
C1279/79 Acceleration sensor output voltage malfunction• Yaw rate and deceleration sensor
• Sensor installation
C1281/81 Master cylinder pressure sensor output malfunction• Stop light switch
• Master cylinder pressure sensor
DTC Code Detection Item Trouble Area
C0371/71 Yaw rate sensor Yaw rate and deceleration sensor DTC Code Detection Item Trouble Area