ECO mode TOYOTA SEQUOIA 2001 Service Service Manual

Immediately after
turning the IG ON
Always
Comes on
for 3 sec.Goes off Comes onOutput
DTC Blinks
(*1)Blinks
(*2)Blinks
(*3)











 Normal
Low tire pressure
System fail
ECU connector poorly
connected
TC ground
(There is no DTC)
TC ground
(There is DTC)
Test mode
F19135
ON
OFF0.5 sec.
0.5 sec. DI±818
± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
1012 Author: Date:
2005 SEQUOIA (RM1146U)
5. TIRE PRESSURE WARNING LAMP CHART
HINT:
The table below indicates the state of the tire pressure warning lamp after the ignition switch is turned ON.
*1: Comes on and goes off repeatedly at 0.5 second intervals.

± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
DI±863
1057 Author: Date:
2005 SEQUOIA (RM1146U)
7 Check tire pressure warning lamp.
PREPARATION:
(a) Turn the ignition switch to the ON position.
(b) Enter TEST MODE (see page DI±810).
(c) Press the tire pressure warning reset switch for 1 second or more after switching to TEST MODE.
CHECK:
Does the tire pressure warning lamp come on while pressing the tire pressure warning reset switch?
RESULT:
Comes onA
Does not come onB
B Go to step 14.
A

F19792
Combination Meter
Tire Pressure Monitor ECU
To BatterySPD G±O3
T17 C520
IEInstrument Panel J/BG±O
J8
J/C
AIF 10
1
1H11
T17GND
IG W±B W±B
T17 J17
J/C
BB
2 DI±870
± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
1064 Author: Date:
2005 SEQUOIA (RM1146U)
DTC C2191/91 Vehicle Speed Signal Error
CIRCUIT DESCRIPTION
The tire pressure monitor ECU receives a speed signal from the combination meter. This DTC is stored upon
entering test mode but erased when a vehicle speed signal of 12 mph (20 km/h) is detected for 3 seconds
or more. The DTC is output only in test mode.
DTC No.DTC Detecting ConditionTrouble Area
C2191/91Speed sensor circuit malfunction.

Vehicle speed sensor

Combination meter assy

Tire pressure monitor ECU

Wire harness
WIRING DIAGRAM
DIDKE±01

DIDLU±01
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±891
1085 Author: Date:
2005 SEQUOIA (RM1146U)
ABS WITH EBD & BA & TRAC & VSC SYSTEM
PRECAUTION
NOTICE:
When disconnecting the battery terminal, initialize the following system after the terminal is recon-
nected.
System NameSee Page
Back Door Power Window Control SystemBE±77

When there is a malfunction in the contact point of the terminals or installation problems with
parts, removal and installation of the suspected problem parts may return the system to the
normal condition either completely or temporarily.

In order to determine the malfunctioning area, be sure to check the conditions at the time the
malfunction occurred, such as by DTC output and freeze frame data output, and record it before
disconnecting each connector or removing and installing parts.

Since the ABS with EBD & BA & TRAC & VSC systems may be influenced by a malfunction in
the other systems, be sure to check for DTCs in the other systems.

Be sure to remove and install the ABS & VSC actuator and each sensor with the IG switch OFF
unless specified in the inspection procedure.

When removing and installing the ABS & VSC actuator and each sensor, be sure to check that
the normal display is output in test mode inspection and in DTC output inspection after instal-
ling all the parts.

After replacing the yaw rate sensor and/or the ABS & VSC actuator assembly, make sure to per-
form yaw rate and deceleration sensors' zero point calibration
(See page DI±897).

The CAN communication system is used for data communication between the skid control ECU
(included in the actuator), the steering angle sensor, and the yaw rate sensor (the deceleration
sensor is included). If there is trouble in the CAN communication line, the DTC of the commu-
nication line is output.

If the DTC of the CAN communication line is output, repair the malfunction and troubleshoot
the ABS with EBD & BA & TRAC & VSC systems.

Since the CAN communication line has its own length and route, it can not be repaired tempo-
rarily with the bypass wire, etc.

DIDLY±01
F09750
DLC3
Ts
Tc
CG
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±897
1091 Author: Date:
2005 SEQUOIA (RM1146U)
CALIBRATION
1. ZERO POINT CALIBRATION OF MASTER CYLINDER
PRESSURE, YAW RATE AND DECELERATION SEN-
SORS
HINT:
When having replaced the master cylinder pressure, yaw rate
and deceleration sensors and/or the ECU, make sure to per-
form master cylinder pressure, yaw rate and deceleration sen-
sors' zero point calibration.
NOTICE:

While obtaining the zero point, do not vibrate the ve-
hicle by tilting, moving or shaking it and keep it in a
stationary condition. (Do not start the engine.)

Be sure to do this on a level surface (within an inclina-
tion of 1 degree).
(a) Perform master cylinder pressure, yaw rate and decelera-
tion sensors zero point calibration.
(1) Using SST, connect terminals Ts and CG of the
DLC3.
SST 09843±18040
(2) Shift the shift lever to the P position.
(3) Turn the ignition switch to the ON position.
(4) Keep the vehicle in a stationary condition on a level
surface for 4 sec. or more.
(5) Keep your foot off the brake pedal.
Do not leave 4WD vehicles in the L4 position.
(6) Press the center diff. lock (TRAC OFF) switch 3
times within 3 seconds.
(7) Check that the VSC buzzer sounds for 3 seconds.
HINT:

If the VSC buzzer does not sound, do the zero point cal-
ibration again and/or check the VSC buzzer circuit (See
page DI±1052).

If the VSC buzzer does not sound, check for yaw rate and
deceleration sensor failure (See page DI±911).
(8) Turn the ignition switch OFF.
(9) Disconnect terminals Ts and CG of the DLC3.
(b) Perform steering angle sensor zero point calibration.
This calibration is carried out automatically by following
procedures below:
(1) Make sure the system is not in sensor check mode.
(2) Calibrate the steering angle sensor by driving the
vehicle in a straight line at more than 7 MPH (12
km/h) for 5 seconds.

D05981
Hand±held
Tester
DLC3
BR3904
0.13 sec. 0.13 sec.
ON
OFF
F02135
Start Position
End PositionWithin ± 5° DI±902
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
1096 Author: Date:
2005 SEQUOIA (RM1146U)
2. When using the hand±held tester:
SENSOR CHECK (TEST MODE)
NOTICE:
When having replaced the master cylinder pressure, yaw
rate and deceleration sensors and/or ECU, perform zero
point calibration of the master cylinder pressure, yaw rate
and deceleration sensors (See page DI±897). Make sure
that this operation is done before performing the following.
(a) Procedures for test mode:
(1) Connect the hand±held tester to the DLC3.
(2) Check that the shift lever is in the P position, and
turn the steering wheel to the neutral position.
(3) Start the engine.
(4) Select the SIGNAL CHECK on the hand±held tes-
ter.
(5) Check that the ABS warning light and VSC TRAC
warning light blink.
HINT:
If the ABS and VSC TRAC warning lights do not blink, inspect
the ABS warning light circuit, VSC TRAC warning light circuit
and Ts terminal circuit.
(6) Keep the vehicle in a stationary condition on a level
surface for 4 sec. or more.
ABS warning light circuitDI±1021 or DI±1025
VSC TRAC warning light circuitDI±1027 or DI±1031
Ts terminal circuitDI±1057
(b) Check the yaw rate and deceleration sensor.
Shift the shift lever to the D position and drive the vehicle
at a vehicle speed of approx. 3 mph (5 km/h), turn the
steering wheel either to the left or right for 90° or more,
and turn the vehicle through 180 degrees. Check that the
VSC buzzer sounds for 3 seconds upon start off.
Stop the vehicle and shift the shift lever to the P position,
check that the VSC buzzer sounds again for 3 seconds.

DIDM1±01
F13444
USA: CANADA:USA: CANADA:2WD: 4WD:
DI±910
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
1104 Author: Date:
2005 SEQUOIA (RM1146U)
DIAGNOSIS SYSTEM
1. CHECK WARNING LIGHT
(a) Release the parking brake pedal.
(b) When the ignition switch is turned ON, check that the ABS
warning light, VSC TRAC warning light, VSC OFF (TRAC
OFF) indicator light, BRAKE warning light and SLIP indi-
cator light come on for approx. 3 seconds.
HINT:

When the parking brake is applied or the level of the brake
fluid is low, the BRAKE warning light comes on.

If the indicator check result is not normal, proceed to trou-
bleshooting for the ABS warning light circuit, VSC TRAC
warning light circuit, VSC OFF (TRAC OFF) indicator light
circuit, BRAKE warning light circuit or SLIP indicator light
circuit.
Trouble AreaSee page
ABS warning light circuitDI±1021 or
DI±1025
VSC TRAC warning light circuitDI±1027 or
DI±1031
VSC OFF (TRAC OFF) indicator light circuitDI±1048
BRAKE warning light circuitDI±1033 or
DI±1038
SLIP indicator light circuitDI±1041 or
DI±1045

The DTCs are simultaneously stored in the memory. The
DTCs can be read by connecting the SST between TC
and CG terminals of the DLC3 and observing the blinking
of the ABS and VSC warning lights, or by connecting a
hand±held tester.

This system has a sensor signal check function (TEST
MODE) (See page DI±899).
The DTC can be read by connecting the SST between ter-
minals TS and CG of the DLC3 and observing the blinking
of the ABS and VSC TRAC warning lights, or by connect-
ing a hand±held tester.

± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±1043
1237 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
HINT:
Start the inspection from step 1 when using the hand±held tester and start from step 2 when not using the
hand±held tester.
1 Check operation of the SLIP indicator light.
PREPARATION:
(a) Connect the hand±held tester to the DLC3.
(b) Turn the ignition switch to the ON position and push the hand±held tester main switch ON.
(c) Select ACTIVE TEST mode on the hand±held tester.
CHECK:
Check that ºONº and ºOFFº of the SLIP indicator light can be shown on the combination meter with the hand±
held tester.
ItemVehicle Condition / Test DetailsDiagnostic Note
SLIP INDI LIGHTTurns SLIP indicator light ON / OFFObserve combination me-
ter
OK:
SLIP indicator operates.
NG Go to step 5.
OK
2 Check harness and connector between skid control ECU and translate ECU.
NG Repair or replace harness or connector.
OK
3 Check that the SLIP indicator light is ON for 3 seconds immediately after ignition
switch is turned ON.
OK:
SLIP indicator light is ON for 3 seconds immediately after ignition switch is turned ON.
OK No problem.
NG

DI±1350
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1544 Author: Date:
2005 SEQUOIA (RM1146U)
DTC B1796 Sleep Operation Failure Of Occupant
Classification ECU
CIRCUIT DESCRIPTION
During sleep mode, the occupant classification ECU reads the condition of each sensor while the ignition
switch is off.
In this mode, if occupant classification ECU detects an internal malfunction, DTC B1796 is output.
DTC No.DTC Detecting ConditionTrouble Area
B1796
Occupant classification ECU malfunction
Occupant classification ECU
HINT:
When DTC B1650/32 is detected as a result of troubleshooting for the supplemental restraint system, check
the DTCs stored in the occupant classification ECU. When DTC B1796 is output, perform troubleshooting
for the DTC.
INSPECTION PROCEDURE
1 Check DTC.
CHECK:
(a) Turn the ignition switch to the ON position, and wait for at least 10 seconds.
(b) Clear the DTCs stored in memory (see page DI±1147).
HINT:
First clear DTCs stored in the occupant classification ECU and then in the airbag sensor assembly.
(c) Turn the ignition switch to the LOCK position.
(d) Turn the ignition switch to the ON position.
(e) Using the hand±held tester, check the DTCs of the occupant classification ECU (see page DI±1147).
OK:
DTC B1796 is not output.
HINT:
Codes other than DTC B1796 may be output at this time, but they are not related to this check.
NG Go to step 2.
OK
From the results of the above inspection, the malfunctioning part can now be considered normal.
To make sure of this, use the simulation method to check (see page DI±1137).
DIDHH±01

H01003H23354
D Squib
Spiral
Cable
Airbag
Sensor
Assembly
C D
E F
DI±1362
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1556 Author: Date:
2005 SEQUOIA (RM1146U)
12 Check steering wheel pad (D squib).
PREPARATION:
(a) Turn the ignition switch to the LOCK position.
(b) Disconnect the negative (±) terminal cable from the bat-
tery, and wait for at least 90 seconds.
(c) From the step 11:
Disconnect the service wire from connector ºEº.
(d) Connect the connectors to the steering wheel pad.
(e) Connect the negative (±) terminal cable to the battery,
and wait for at least 2 seconds.
CHECK:
(a) Turn the ignition switch to the ON position, and wait for at
least 60 seconds.
(b) Clear the DTCs stored in memory (see page DI±1147).
(c) Turn the ignition switch to the LOCK position.
(d) Turn the ignition switch to the ON position, and wait for at
least 60 seconds.
(e) Check the DTCs (see page DI±1147).
OK:
DTC B1800, B1801, B1802 or B1803 is not output.
HINT:
Codes other than DTC B1800, B1801, B1802 and B1803 may
be output at this time, but they are not related to this check.
NG
Replace steering wheel pad
(see page RS±82).
OK
From the results of the above inspection, the malfunctioning part can now be considered normal.
To make sure of this, use the simulation method to check (see page DI±1137).
HINT:

Perform the simulation method by selecting the check mode with the hand±held tester (see page
DI±1151).

After selecting the check mode, perform the simulation method by wiggling each connector of the air-
bag system or driving the vehicle on a city or rough road (see page DI±1151).