2001 TOYOTA SEQUOIA Trac off

± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±945
1139 Author: Date:
2005 SEQUOIA (RM1146U)
DTC C1223 / 43 Malfunction in ABS Control System
CIRCUIT DESCRIPTION
HINT:
This DTC is output when the VSC system detects a malfunction in the ABS system.
DTC No.DTC Detecting ConditionTrouble Area
C1223 / 43ABS control system is abnormal.ABS control system
INSPECTION PROCEDURE
1 Check DTC (See page DI±911).
PREPARATION:
(a) Clear the DTC.
(b) Turn the ignition switch OFF.
CHECK:
Turn the ignition switch to the ON position, and check if the same DTC still remains in the memory.
RESULT:
DTC is outputA
DTC is not outputB
B No problem.
A
Repair circuit indicated by output code
(See page DI±921).
DI93K±03

DI±950
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
1144 Author: Date:
2005 SEQUOIA (RM1146U)
6 Replace the skid control ECU and check if trouble occurs again.
PREPARATION:
(a) Clear the DTC.
(b) Turn the ignition switch OFF.
CHECK:
Check if the same DTC still remains in the memory.
RESULT:
DTC is outputA
DTC is not outputB
B END.
A
Replace steering angle sensor.
NOTICE:

When replacing the skid control ECU, perform the zero point calibration (See page DI±897).

If the steering angle sensor has been replaced, drive the vehicle straight ahead at a speed of
6.5 mph (10.5 km/h) or more to calibrate the steering angle sensor.
7 Check DTC once more (See page DI±911).
PREPARATION:
(a) Clear the DTC.
(b) Turn the ignition switch OFF.
CHECK:
Check if the same DTC still remains in the memory.
RESULT:
DTC is outputA
DTC is not outputB
B END.
A
Replace skid control ECU with actuator
(See page BR±52).
NOTICE:
When replacing the skid control ECU, perform the zero point calibration (See page DI±897).

± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±963
1157 Author: Date:
2005 SEQUOIA (RM1146U)
DTC C1249 / 49 Open Circuit in Stop Light Switch Cir-
cuit
CIRCUIT DESCRIPTION
The skid control ECU inputs the stop light switch signal and detects the status of the brake operation.
The skid control ECU has an open detection circuit. If an open in the stop lamp switch input line or GND side
stop lamp circuit is detected when the stop lamp switch is off, this DTC is output.
DTC No.DTC Detecting ConditionTrouble Area
C1249 / 49ECU terminal STP voltage is low when both ignition switch
and stop light switch are ON.
Stop light switch

Stop light switch circuit

Skid control ECU
DI93P±03

F16994
STP
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±965
1159 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check operation of the stop light switch.
CHECK:
Check that the stop light comes on when the brake pedal is depressed and turns off when the brake pedal
is released.
OK:
Stop light switch operation is normal.
NG Repair stop light circuit (See page BE±46).
OK
2 Check voltage between terminal STP of the skid control ECU and body ground.
PREPARATION:
Disconnect the skid control ECU connector.
CHECK:
Measure the voltage between terminal STP of the skid control
ECU harness side connector and body ground during depress-
ing the brake pedal.
OK:
Voltage: 8 to 14 V
OK Replace skid control ECU
(See page BR±52).
NOTICE:
When replacing the skid control ECU, perform the zero
point calibration (See page DI±897).
NG
Check for open circuit in harness and con-
nector between skid control ECU and stop
light switch (See page IN±35).

± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±967
1161 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check pump motor operation.
PREPARATION:
(a) Select the item ºABS MOTOR RELAYº in the ACTIVE TEST and operate the ABS motor relay on the
hand±held tester.
(b) Check the operation sound of the ABS pump motor when operating it with the hand±held tester.
ItemVehicle Condition / Test DetailsDiagnostic Note
ABS MOT RELAYTurns ABS motor relay ON / OFFOperation of motor (click-
ing sound) can be heard
CHECK:
The operation sound of the pump motor should be heard.
OK:
Operation sound can be heard.
NG Go to step 2.
OK
Check and replace ABS & VSC actuator with
skid control ECU (See page BR±52).
NOTICE:
When replacing the skid control ECU, perform the zero point calibration (See page DI±897).

DI±980
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
1174 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check center differential lock operation (See page TR±39).
OK:
Center differential lock operation is norm.
NG Repair or replace one±touch 2±4 selector sys-
tem.
OK
2 Check operation of the center differential lock indicator light.
PREPARATION:
(a) Turn the ignition switch to the ON position.
(b) Set the transfer to the L4 position.
CHECK:
Check that pressing the center differential lock switch locks the differential and turns the lock indicator on.
OK:
Indicator light: ON/OFF or OFF/ON
HINT:
When the center differential cannot be shifted to LOCK smoothly, the center differential lock indicator light
will blink.
NG Repair or replace center differential lock indica-
tor light circuit.
OK
3 Check that the 4WD ECU connectors are securely connected to the 4WD ECU.
NO Connect the connector to the 4WD ECU.
YES

± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±981
1175 Author: Date:
2005 SEQUOIA (RM1146U)
4 Check for open and short circuit in harnesses and connectors between termi-
nals CD of the translate ECU and IND of the 4WD control ECU, EXI2 of the trans-
late ECU and detection SW (See page IN±35).
NG Repair or replace harness or connector.
OK
5 Replace the translate ECU and check if the trouble occurs again.
PREPARATION:
(a) Clear the DTC (See page DI±911).
(b) Turn the ignition switch OFF.
CHECK:
Turn the ignition switch to the ON position, and check if the same DTC still remains in the memory.
RESULT:
DTC is outputA
DTC is not outputB
B END
A

DI±982
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
1176 Author: Date:
2005 SEQUOIA (RM1146U)
6 Replace skid control ECU and check if the trouble occurs again
(See page BR±52 and DI±911).
PREPARATION:
(a) Clear the DTC (See page DI±911).
(b) Turn the ignition switch OFF.
CHECK:
Turn the ignition switch to the ON position, and check if the same DTC still remains in the memory.
RESULT:
DTC is outputA
DTC is not outputB
B END
A
Check and replace 4WD control ECU.
NOTICE:
When replacing the skid control ECU, perform the zero point calibration (See page DI±897).