ecu TOYOTA SIENNA 2007 Service Repair Manual

BC–54BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEM
BC
DESCRIPTION
If the ECU detects a trouble, it turns on the brake warning light at the same time of prohibiting ABS
control.
At this time, the ECU records a DTC in memory.
Connect terminals TC and CG of the DLC3 to make the brake warning light blink and output the DTC.
WIRING DIAGRAM
Brake Warning Light Remains ON
C160966E01

BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEMBC–55
BC
INSPECTION PROCEDURE
(a) Check if the ABS DTC is output (See page BC-10).
Result
B
A
(a) Check the skid control ECU connector's connecting
condition.
OK:
The connector should be securely connected.
NG
OK
(a) Check the battery voltage.
Standard voltage:
10 to 14 V
NG
OK
(a) Disconnect the skid control ECU connector.
(b) Turn the ignition switch to the on position.
1CHECK DTC
Condition Proceed to
DTC is not outputA
DTC is outputB
REPAIR CIRCUITS INDICATED BY OUTPUT
DTCS
2INSPECT SKID CONTROL ECU CONNECTOR SECURELY CONNECTED
CONNECT CONNECTOR TO ECU
CORRECTLY
3INSPECT BATTERY
INSPECT CHARGING SYSTEM
4INSPECT SKID CONTROL ECU (IG1 TERMINAL VOLTAGE)

BC–56BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEM
BC
(c) Measure the voltage according to the value(s) in the
table below.
Standard voltage
NG
OK
(a) Disconnect the skid control ECU connector.
(b) Measure the resistance according to the value(s) in the
table below.
Standard resistance
NG
OK
(a) Disconnect the parking brake switch connector.
(b) Measure the resistance according to the value(s) in the
table below.
Standard resistance
NG
OK
C122930E14
Tester Connection Condition Specified Condition
S3-3 (IG1) - Body
groundIgnition switch ON (IG) 10 to 14 V
REPAIR OR REPLACE HARNESS OR
CONNECTOR (IG1 CIRCUIT)
5INSPECT SKID CONTROL ECU (GND TERMINAL CONTINUITY)
C058919E22
Tester Connection Specified Condition
S3-1 (GND1) - Body ground Below 1
S3-23 (GND2) - Body ground Below 1
REPAIR OR REPLACE HARNESS OR
CONNECTOR (GND CIRCUIT)
6INSPECT PARKING BRAKE SWITCH
C106667E07
Tester Connection Condition Specified Condition
P6-1 - Body groundParking brake switch
ON
(Switch pin free)Below 1
P6-1 - Body groundParking brake switch
OFF
(Switch pin pushed in)10 k or higher
REPLACE PARKING BRAKE SWITCH

BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEMBC–57
BC
(a) Disconnect the skid control ECU connector and parking
brake switch.
(b) Measure the resistance according to the value(s) in the
table below.
Standard resistance
NG
OK
(a) Remove the reservoir tank cap and strainer.
(b) Disconnect the brake fluid level warning switch
connector.
7CHECK HARNESS AND CONNECTOR
C122972E04
Tester Connection Specified Condition
S3-12 (PKB) - P6-1 Below 1
S3-12 (PKB) - Body ground 10 k or higher
REPAIR OR REPLACE HARNESS OR
CONNECTOR (PKB CIRCUIT)
8INSPECT BRAKE FLUID LEVEL WARNING SWITCH

BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEMBC–59
BC
(b) Measure the resistance according to the value(s) in the
table below.
Standard resistance
NG
OK
(a) Turn the ignition switch off.
(b) Disconnect the combination meter connector.
C119429E03
Tester Connection Specified Condition
C10-13 - B1-1 Below 1
C10-13 - Body ground 10 k or higher
B1-2 - Body ground Below 1
REPAIR OR REPLACE HARNESS OR
CONNECTOR (BRAKE FLUID LEVEL
WARNING SWITCH CIRCUIT)
10CHECK HARNESS AND CONNECTOR (BETWEEN SKID CONTROL ECU AND
COMBINATION METER ASSEMBLY)

BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEMBC–61
BC
WIRING DIAGRAM
See page BC-52.
INSPECTION PROCEDURE
(a) Disconnect the skid control ECU connector.
(b) Turn the ignition switch to the on position.
(c) Check that the BRAKE warning light comes on.
OK:
BRAKE warning light comes on.
HINT:
If troubleshooting has been carried out according to the
PROBLEM SYMPTOMS TABLE, refer back to the table and
proceed to the next step before replacing the part (See page
BC-7).
NG
OK
(a) Turn the ignition switch off.
(b) Disconnect the combination meter connector.
Brake Warning Light does not Come ON
1INSPECT BRAKE WARNING LIGHT
Go to step 2
REPLACE BRAKE ACTUATOR ASSEMBLY
2CHECK HARNESS AND CONNECTOR (BETWEEN SKID CONTROL ECU AND
COMBINATION METER ASSEMBLY)

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