2001 TOYOTA SEQUOIA Page 18

F13989
1
2(Oscilloscope)
5
(Oscilloscope)
ON
F17283
(Reference)IG ON Released Depressed
0 V
6 V
0 V 6 VPSNC±STS
PSNO±STS
F13990
5
21
ON
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±993
1187 Author: Date:
2005 SEQUOIA (RM1146U)
2 Check booster pedal force switch.
When using the oscilloscope:
PREPARATION:
(a) Connect the oscilloscope between terminals PSNO(1)
and STS(5), PSNC(2) and STS(5) of the brake booster
with connector being connected.
(b) Turn the ignition switch to the ON position.
CHECK:
Check the signal waveform while the brake pedal is depressed
and released.
OK:
When not using the oscilloscope:
PREPARATION:
(a) Disconnect the connector from the brake booster.
(b) Turn the ignition switch to the ON position.
CHECK:
Check continuity between the terminals while depressing and
releasing the brake pedal.
OK:
Tester ConnectionConditionSpecified Condition
Terminals 2 ± 5ReleasedContinuity
Terminals 1 ± 5DepressedContinuity
NG Replace brake booster
(See page BR±22).
OK

DI±994
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
1188 Author: Date:
2005 SEQUOIA (RM1146U)
3 Check for open and short circuit in harness and connector between booster ped-
al force switch and skid control ECU (See page IN±35).
NG Repair or replace harness or connector.
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).

± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±997
1191 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check the DTC of the VSC (See page DI±911).
CHECK:
Check skid control ECU DTC.
RESULT:
DTC is not outputA
DTC (C1203 / 53) is outputB
B Repair circuit indicated by output code
(See page DI±921).
A
2 Check for open and short circuit in harness and connector between skid control
ECU and translate ECU (CAN1 circuit).
NG Repair or replace harness or connector
(CAN1 circuit).
OK
Replace translate ECU.

F19152
Translate ECU
GND
DI±1000
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
1194 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check the DTC of the VSC (See page DI±911).
CHECK:
Check skid control ECU DTC.
RESULT:
DTC is not outputA
DTC (C1203/53) is outputB
B Repair circuit indicated by the output code
(See page DI±921).
A
2 Check for open circuit in harness and connector between GND terminal of the
translate ECU and body ground.
PREPARATION:
Disconnect the translate ECU connector.
CHECK:
Measure the resistance between the GND terminal and body
ground.
OK:
Continuity
NG Repair or replace harness or connector (Trans-
late ECU GND circuit).
OK

± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±1001
1195 Author: Date:
2005 SEQUOIA (RM1146U)
3 Replace the translate ECU and check if the trouble occurs again.
PREPARATION:
(a) Clear the translate 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 is stored in the memory.
PREPARATION:
DTC 53 is not outputA
DTC 53 is outputB
B Replace skid control ECU
(See page BR±52).
NOTICE:
When replacing the skid control ECU, perform zero point
calibration (See page DI±897).
A
END

F18069
P2
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±1003
1197 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check the DTC of the VSC (See page DI±911).
CHECK:
Check skid control ECU DTC.
RESULT:
DTC is not outputA
DTC (C1202 / 52) is outputB
B Repair circuit indicated by the output code
(See page DI±921).
A
2 Check brake fluid level warning switch.
PREPARATION:
Disconnect the brake fluid level warning switch connector.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester ConnectionSwitch ConditionSpecified Condition
(B2±1) ± (B2±2)Float UP10 kW or more
(No continuity)
(B2±1) ± (B2±2)Float DOWN1 W or less (Continuity)
NG Replace brake fluid level warning switch.
OK
3 Check for open and short circuit in harness and connector between brake fluid
level warning switch and translate ECU (See page IN±35).
NG Repair or replace harness or connector.
OK

DI±1004
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
1198 Author: Date:
2005 SEQUOIA (RM1146U)
4 Replace the translate ECU and check if the trouble occurs again.
PREPARATION:
(a) Clear the translate 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 is stored in the memory.
PREPARATION:
DTC 58 is not outputA
DTC 58 is outputB
B Replace skid control ECU
(See page BR±52).
NOTICE:
When replacing the skid control ECU, perform zero point
calibration (See page DI±897).
A
END

F19152
Translate ECU
GND
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±1007
1201 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check DTC of the VSC (See page DI±911).
CHECK:
Check skid control ECU DTC.
RESULT:
DTC is not outputA
DTC is outputB
B Repair circuit indicated by the output code
(See page DI±921).
A
2 Check for open circuit in harness and connector between GND terminal of the
translate ECU and body ground (See page IN±35).
PREPARATION:
Disconnect the translate ECU connector.
CHECK:
Measure the resistance between the GND terminal and body
ground.
OK:
Continuity
NG Repair or replace harness or connector (Trans-
late ECU GND circuit.
OK