2001 TOYOTA SEQUOIA DLC3 Ts

DI±764
± DIAGNOSTICSAIR SUSPENSION SYSTEM
958 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Inspect battery voltage.
CHECK:
Check the battery voltage.
OK:
Voltage: 11 to 14 V
NG Replace battery.
OK
HINT:
Start the inspection from step 2 when using the hand±held tester, and start from step 3 when not using the
hand±held tester.
2 Read value of the hand±held tester.
PREPARATION:
(a) Connect the hand±held tester to the DLC3.
(b) Turn the ignition switch ON, and push the hand±held tester main switch ON.
(c) Select the item ºPOWER VOLTAGEº in the DATA LIST, and read its value displayed on the hand±held
tester.
AIR SUSPENSION:
ItemMeasurement Item / Range (Dis-
play)Normal ConditionDiagnostic Note
POWER VOLTAGE+B power source voltage / min.: 0
V, max.: 25.5 VActual battery power supply volt-
age: 10 to 14 V±
CHECK:
Check the battery positive voltage.
OK:
Actual battery power supply voltage: 10 to 14 V
RESULT:
NGA
OK (When troubleshooting according to the PROBLEM SYMPTOMS TABLE)B
OK (When troubleshooting according to the DTC chart)C
B Proceed to next circuit inspection shown in
problem symptoms table (See page DI±716).
C Check for intermittent problems.
HINT:
Check the connector and terminal (See page IN±24).

± DIAGNOSTICSAIR SUSPENSION SYSTEM
DI±775
969 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 Read value of the hand±held tester.
PREPARATION:
(a) Connect the hand±held tester to the DLC3.
(b) Turn the ignition switch ON, and turn the hand±held tester main switch ON.
(c) Select the item ºHEIGHT SW DOWNº or ºHEIGHT SW UPº in the DATA LIST, and read its value dis-
played on the hand±held tester.
AIR SUSPENSION:
ItemMeasurement Item / Range (Dis-
play)Normal ConditionDiagnostic Note
HEIGHT SW DOWNHeight control switch (DOWN) /
ON or OFFON: Height control switch
ºDOWNº button is pressed
OFF: ±
±
HEIGHT SW UPHeight control switch (UP) / ON or
OFFON: Height control switch ºUPº
button is pressed
OFF: ±
±
CHECK:
Check that the value displayed on the hand±held tester changes by pressing the height control switch ºUPº
or ºDOWNº.
OK:
Height control switch value changes.
RESULT:
NGA
OK (When troubleshooting according to the PROBLEM SYMPTOMS TABLE)B
OK (When troubleshooting according to the DTC chart)C
B Proceed to next circuit inspection shown in
problem symptoms table (See page DI±716).
C Replace suspension control ECU
(See page IN±35).
A

± DIAGNOSTICSAIR SUSPENSION SYSTEM
DI±779
973 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 Read value of the hand±held tester.
PREPARATION:
(a) Connect the hand±held tester to the DLC3.
(b) Turn the ignition switch ON, and turn the hand±held tester main switch ON.
(c) Select the item ºHEIGHT SW HOLDº in the DATA LIST, and read its value displayed on the hand±held
tester.
AIR SUSPENSION:
ItemMeasurement Item / Range (Dis-
play)Normal ConditionDiagnostic Note
HEIGHT SW HOLDHeight control mode select switch
/ ON or OFFON: Height control mode select
switch is pressed
OFF: ±
±
CHECK:
Check that the value displayed on the hand±held tester changes by pressing the height control mode select
switch.
OK:
Height control mode select switch value changes.
RESULT:
NGA
OK (When troubleshooting according to the PROBLEM SYMPTOMS TABLE)B
OK (When troubleshooting according to the DTC chart)C
B Proceed to next circuit inspection shown in
problem symptoms table (See page DI±716).
C Replace suspension control ECU
(See page IN±35).
A

F19451
C6
Combination
MeterSuspension Control
ECU
I18
Ignition SW
Engine Room J/B Instrument Panel J/B B±O
W±R11
7 1H
1JIGN1
1C
1C32
B±RMAN. 24
13 LG11
S25 VN
5
IG2 AM2 6
W±R
B
Battery 1
2D AM2
2C1
B5 4F10
FL Block
± DIAGNOSTICSAIR SUSPENSION SYSTEM
DI±789
983 Author: Date:
2005 SEQUOIA (RM1146U)
Height Control Manual Indicator Lamp Circuit
CIRCUIT DESCRIPTION
When manual mode is selected by pressing the height control mode select switch, the manual indicator lamp
comes on. (For the wiring diagram of the height control mode select switch circuit, see page DI±778.) If the
suspension control ECU detects a problem, the height control manual indicator lamp blinks while suspend-
ing the height control function. At the same time, the suspension control ECU records a DTC in the memory.
Connect terminals TC and CG of the DLC3 to make the height control manual indicator lamp blink and output
DTCs.
WIRING DIAGRAM
DIDEN±01

DI±794
± DIAGNOSTICSAIR SUSPENSION SYSTEM
988 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 Read value of the hand±held tester.
PREPARATION:
(a) Connect the hand±held tester to the DLC3.
(b) Turn the ignition switch ON, and push the hand±held tester main switch ON.
(c) Select the item ºIG VOLTAGEº in the DATA LIST, and read its value displayed on the hand±held tester.
AIR SUSPENSION:
ItemMeasurement Item / Range (Dis-
play)Normal ConditionDiagnostic Note
IG VOLTAGEECU power supply voltage / min.:
0 V, max.: 25.5 VActual ECU power supply voltage:
10 to 14 V±
CHECK:
Check the ECU supply voltage.
OK:
Actual ECU power supply voltage: 10 to 14 V
OK Proceed to next circuit inspection shown in
problem symptoms table (See page DI±716).
NG

DIDJV±01
F19126
Combination meter assy
(Vehicle speed signal)
Tire pressure monitor receiver assyCombination meter assy
(Tire pressure warning lamp) Tire
Pressure
Monitor
ECU
: Radio signal
Tire Pressure Sensor
(Tire pressure monitor valve
sub±assy) (FR LH)
Tire Pressure Sensor
(Tire pressure monitor valve
sub±assy) (FR RH)
Tire Pressure Sensor
(Tire pressure monitor valve
sub±assy) (RR LH)
Tire Pressure Sensor
(Tire pressure monitor valve
sub±assy) (RR RH)
Tire Pressure Sensor
(Tire pressure monitor valve
sub±assy) (SPARE)
DLC3
Tire pressure warning reset switch
± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
DI±799
993 Author: Date:
2005 SEQUOIA (RM1146U)
SYSTEM DIAGRAM

DIDJW±01
F19887
Tire Pressure Monitor Valve Sub±assy
Tire Pressure
Warning Reset
Switch
Tire Pressure
Monitor ECU
Meter
DLC3
Tire Pressure Monitor Valve Sub±assyTire Pressure Monitor Receiver Assy
DI±800
± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
994 Author: Date:
2005 SEQUOIA (RM1146U)
SYSTEM DESCRIPTION
1. DESCRIPTION OF SYSTEM
(a) A tire pressure monitor valve sub±assy equipped with a tire pressure sensor and a transmitter and is
installed in a tire wheel assy. The sensor measures the tire pressure and the measured value and
transmitter ID are transmitted to the tire pressure monitor receiver assy on the body as radio waves
and then sent to the tire pressure monitor ECU from the tire pressure monitor receiver. If the transmitter
ID has already been registered, the ECU compares the measured air pressure value with the standard
value. When the value is less than the standard value registered in the tire pressure monitor ECU, the
warning lamp on the combination meter comes on.

To address the differences in the air pressure settings by the type of tires, or the differences in
pressure between the front and rear tires, a tire pressure warning reset switch has been newly
adopted.

Along with the adoption of the tire pressure warning reset switch, the warning operation has been
changed.

TPWS transmitters with different bending angles as the tire pressure monitor valve sub±assy
have been provided for steel wheels with center ornaments. (They are not interchangeable with
aluminum wheels or steel wheels with full wheel caps.)
2. WHEN TIRE PRESSURE WARNING LAMP IS LIT
(a) When the warning lamp does not go off, or when it comes on during driving, check tire pressure. If the
warning lamp is lit even though the tire pressure is correctly adjusted, the tire could be punctured.
(b) Under the following conditions, the system may not function properly.

The areas, facilities or devices that use similar radio frequencies are located in the vicinity of the
vehicle.

A radio device of similar frequency is used in the vehicle.

A lot of snow or ice is stuck to the vehicle, especially onto the wheels and around the wheel
houses.

The battery of the sensor has been depleted.

The tires without tire pressure monitor valve sub±assy are used.

Tire chains are used.

DIDJZ±01
F19326
F19327
F19328
± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
DI±805
999 Author: Date:
2005 SEQUOIA (RM1146U)
REGISTRATION
1. IN CASE OF TIRE PRESSURE MONITOR ECU REPLACEMENT
(a) Read ID stored in the old ECU using the hand±held tester.
2. IN CASE OF TIRE PRESSURE MONITOR VALVE SUB±ASSY AND/OR TIRE PRESSURE MON-
ITOR ECU REPLACEMENT
(a) Read ID written on the tire pressure monitor valve.
3. REGISTER TRANSMITTER ID
NOTICE:
It is necessary to register the transmitter ID in the tire pressure monitor ECU when replacing the tire
pressure monitor valve sub±assy and/or tire pressure monitor ECU.
(a) Set the tire pressure of all wheels to the specified value.
Tire sizeFrontRearSpare
P245 / 70 R 16220 kPa (2.2 kgf/cm2, 32 psi)240 kPa (2.4 kgf/cm2, 35 psi)240 kPa (2.4 kgf/cm2, 35 psi)
P265 / 70 R 16220 kPa (2.2 kgf/cm2, 32 psi)220 kPa (2.2 kgf/cm2, 32 psi)220 kPa (2.2 kgf/cm2, 32 psi)
P265 / 65 R 17220 kPa (2.2 kgf/cm2, 32 psi)220 kPa (2.2 kgf/cm2, 32 psi)220 kPa (2.2 kgf/cm2, 32 psi)
(b) Connect the hand±held tester to DLC3.
(c) Turn the ignition switch to the ON position.
(d) Read and write down the ID (ID1 to ID5) by using the
DATA LIST.
(e) Select the REGIST TIRE following the hand±held tester
screen.
(UTILITY ± REGIST TIRE)
(f) Input the ID (ID1 to ID5) using the hand±held tester and
transmit it to the tire pressure monitor ECU.
(g) Set the ID transmission condition to ºSUCCEEDEDº.
HINT:
If the operations of steps (d) to (f) do not complete within 5 min.,
the mode will return to normal operation mode.