four wheel drive TOYOTA SEQUOIA 2001 Service Repair Manual

IN±44
± INTRODUCTIONTERMS
44 Author: Date:
2005 SEQUOIA (RM1146U) T/M
Transmission
TMCTOYOTA Motor Corporation
TMMKTOYOTA Motor Manufacturing Kentucky, Inc.
TRCTraction Control System
TURBOTurbocharge
TWCThree±Way Catalyst
U/DUnderdrive
U/SUndersize
VCVVacuum Control Valve
VENTVentilator
VIMVehicle Interface Module
VINVehicle Identification Number
VPSVariable Power Steering
VSCVehicle Skid Control
VSVVacuum Switching Valve
VTVVacuum Transmitting Valve
VVT±iVariable Valve Timing±intelligent
W/With
WGNWagon
W/HWire Harness
W/OWithout
1STFirst
2NDSecond
2WDTwo Wheel Drive Vehicle (4 x 2)
3RDThird
4THFourth
4WDFour Wheel Drive Vehicle (4 x 4)
4WSFour Wheel Steering System
5THFifth

TR0CL±02
F19803
Differential Lock Switch
Transfer Actuator Four Wheel Drive Control ECU
2WD/4HI Switch4LO Switch
TR±38
± TRANSFERONE TOUCH 2±4 SELECTOR SYSTEM
2976 Author: Date:
2005 SEQUOIA (RM1146U)
ONE TOUCH 2±4 SELECTOR SYSTEM
LOCATION

TR09T±04
F19317
2WD/4HI Switch
F19318
Differential Lock Switch
± TRANSFERONE TOUCH 2±4 SELECTOR SYSTEM
TR±39
2977 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION
NOTICE:

4HI e 4LO: Stop the vehicle and apply the brake, then
first shift the transmission shift lever into the ºNº
position.

Do not operate the four wheel drive control switch
and the differential lock switch at the same time.

Do not change from 2WD to 4WD when vehicle speed
is 62 mph (100 km/h) or more.
1. INSPECT 2WD e 4HI (4WD and differential lock
ºFREEº) SHIFT
(a) Start the engine.
(b) Push the 2WD/4HI switch once.
(c) Check that the 4WD indicator light stays lit after blinking.
(The center differential lock indicator light blinks while be-
ing shifted.)
(d) Push the 2WD/4HI switch once again.
(e) Check that the 4WD indicator light goes off after blinking.
(The center differential lock indicator light blinks while be-
ing shifted.)
2. INSPECT 4HI (4WD and differential lock ºFREEº) e
4HI (4WD and differential lock ºLOCKº) SHIFT
(a) Start the engine.
(b) Push the 2WD/4HI switch once.
(c) Check that the 4WD indicator light stays lit after blinking.
(d) Push the differential lock switch once.
(e) Check that the center differential lock indicator light stays
lit after blinking.
(f) Push the differential lock switch once again.
(g) Check that the center differential lock indicator light goes
off after blinking.
3. INSPECT 4HI (4WD and differential lock ºLOCKº) e
2WD
(a) Start the engine.
(b) Push the 2WD/4HI once.
(c) Check that the 4WD indicator light stays lit after blinking.
(d) Push the differential lock switch once.
(e) Check that the center differential lock indicator light stays
lit after blinking.

F19340
A
B Four Wheel Drive Control ECU:
Transfer Actuator:
± TRANSFERONE TOUCH 2±4 SELECTOR SYSTEM
TR±43
2981 Author: Date:
2005 SEQUOIA (RM1146U)
10. INSPECT ACTUATOR
NOTICE:
Inspect the actuator with the transfer removed from the vehicle.
(a) Turn the ignition switch to ON.
(b) Check the operating sound produced by four wheel drive control switch operation and the differential
lock switch operation.
If the operating sound cannot be heard, check the four wheel control ECU and the wire harness in the next
step. When the wire harness and four wheel drive control ECU are normal, replace the actuator.
11. INSPECT WIRE HARNESS
(a) Disconnect the actuator connector and four wheel drive
control ECU connector.
(b) Check continuity of the wire harness between the four
wheel drive control ECU and the actuator.
Tester connectionSpecified condition
TM1 (A±2) ± TM1 (B±2)Continuity
TM2 (A±1) ± TM2 (B±1)Continuity
TL1 (A±41) ± TL1 (B±3)Continuity
TL2 (A±40) ± TL2 (B±4)Continuity
TL3 (A±39) ± TL3 (B±5)Continuity
HM2 (A±4) ± HM2 (B±7)Continuity
HM1 (A±3) ± HM1 (B±8)Continuity
P1 (A±10) ± CDL (B±9)Continuity
HL2 (A±42) ± HL2 (B±11)Continuity
HL1 (A±23) ± HL1 (B±12)Continuity
GND (A±7) ± GND (B±6)Continuity
GND (A±7) ± GND (B±10)Continuity
If continuity is not as specified, repair or replace the wire har-
ness.

F19566
TR±44
± TRANSFERONE TOUCH 2±4 SELECTOR SYSTEM
2982 Author: Date:
2005 SEQUOIA (RM1146U)
12. INSPECT FOUR WHEEL DRIVE CONTROL ECU
(a) Connect the wire harness side connector to the four wheel drive control ECU and inspect the wire har-
ness side connector from the back, as shown.
STANDARD VALUE OF ECU TERMINAL
Terminals (Symbols)ConditionSTD Voltage (V)
3 (HM1) ± 4 (HM2)

Ignition switch ON

Four wheel drive control switch ºH4º position " Four wheel drive control switch
ºL4º position
10 to 14 " 2 or less
or
4 (HM2) ± 3 (HM1)

Ignition switch ON

Four wheel drive control switch ºL4º position " Four wheel drive control switch
ºH4º position
or
0 (0.5 s) to 14 (50 ms)
pulse generation
2 (TM1) ± 1 (TM2)

Ignition switch ON

Differential lock switch is in ºOFFº position

Four wheel drive control switch ºH2º position " Four wheel drive control switch
ºH4º position
10 to 14 " 2 or less
or
1 (TM2) ± 2 (TM1)

Ignition switch ON

Keep pressing the differential lock switch for approx. 2 seconds to turn it ON

Four wheel drive control switch ºH4ºor ºL4º position " Four wheel drive control
switch ºH2º position
or
0 (0.5 s) to 14 (50 ms)
pulse generation
5 (DM1) ± 6 (DM2)
Ignition switch ON

A.D.D. FREE "A.D.D. LOCK10 to 14 " 2 or less
or
6 (DM2) ± 5 (DM2)
Ignition switch ON

A.D.D. LOCK "A.D.D. FREE
or
0 (0.5 s) to 14 (50 ms)
pulse generation
4 (HM2) ± 7 (GND)

Ignition switch ON

Four wheel drive control switch ºH4º position " Four wheel drive control switch
ºL4º position
2 or less " 10 to 14
7 (GND) ± Body ground
Ignition switch OFFContinuity
12 (IG) ± 7 (GND)
Ignition switch ON10 to 14
18 (DL2) ± 7 (GND)
Ignition switch ON

A.D.D. LOCK "A.D.D. FREE0.88 or less " 10 to 14
19 (DL1) ± 7 (GND)
Ignition switch ON

A.D.D. FREE "A.D.D. LOCK0.88 or less " 10 to 14
23 (HL1) ± 7 (GND)

Ignition switch ON

Four wheel drive control switch ºH4º position " Four wheel drive control switch
ºL4º position
10 to 14 " 1.5 or less
25 (2±4) ± 7 (GND)

Ignition switch ON

Four wheel drive control switch ºL4º position " Four wheel drive control switch
ºH2º or ºH4º position
10 to 14 " 1.5 or less
26 (SPD) ± 7 (GND)
During drivingPulse generation

± TRANSFERONE TOUCH 2±4 SELECTOR SYSTEM
TR±45
2983 Author: Date:
2005 SEQUOIA (RM1146U)28 (IND3) ± 7 (GND)

Ignition switch ON

Four wheel drive control switch ºH2º position " Four wheel drive control switch
ºL4º position
10 to 14 " 0 to 3.5
32 (LO) ± 7 (GND)

Ignition switch ON

Four wheel drive control switch ºH2º position " Four wheel drive control switch
ºL4º position
10 to 14 " 1.5 or less
33 (DL) ± 7 (GND)

Ignition switch ON

Differential lock switch is in ºOFFº position " Keep pressing the differential lock
switch for approx. 2 seconds to turn it ON
10 to 14 " 1.5 or less
9 (ADD) ± 7 (GND)
Ignition switch ON

A.D.D. FREE "A.D.D. LOCK10 to 14 " 1.5 or less
39 (TL3) ± 7 (GND)

Ignition switch ON

Four wheel drive control switch ºH2º position " Four wheel drive control switch
ºL4º position

Differential lock switch is in ºOFFº position " Keep pressing the differential lock
switch for approx. 2 seconds to turn it ON
1.5 or less " 10 to 14
40 (TL2) ± 7 (GND)

Ignition switch ON

Four wheel drive control switch ºH2º position " Four wheel drive control switch
ºH4º position

Differential lock switch is in ºOFFº position " Keep pressing the differential lock
switch for approx. 2 seconds to turn it ON
10 to 14 " 1.5 or less
41 (TL1) ± 7 (GND)

Ignition switch ON

Four wheel drive control switch ºH2º position " Four wheel drive control switch
ºH4º or ºL4º position

Differential lock switch is in ºOFFº position " ºONº position
1.5 or less " 10 to 14
42 (HL2) ± 7 (GND)

Ignition switch ON

Four wheel drive control switch ºH4º position " Four wheel drive control switch
ºL4º position
1.5 or less " 10 to 14
45 (IND1) ± 7 (GND)

Ignition switch ON

Four wheel drive control switch ºH2º position " Four wheel drive control switch
ºH4º or ºL4º position
10 to 14 " 0 to 3.5
46 (IND2) ± 7 (GND)

Ignition switch ON

Differential lock switch is in ºOFFº position " Keep pressing the differential lock
switch for approx. 2 seconds to turn it ON
10 to 14 " 0 to 3.5
48 (N) ± 7 (GND)
Ignition switch ON

Transmission shift lever: positions other than N" N1.5 or less " 10 to 14
50 (L4) ± 7 (GND)

Ignition switch ON

Four wheel drive control switch ºH4º position " Four wheel drive control switch
ºL4º position
10 to 14 " 2 or less
10 (P1) ± 7 (GND)

Ignition switch ON

Four wheel drive control switch ºH2º position " Four wheel drive control switch
ºH4º or ºL4º position

Differential lock switch is in ºOFFº position " ºONº position
10 to 14 " 1.5 or less

05_SEQUOIA_U (L/O 0408)
vii
2005 SEQUOIA from Aug. '04 Prod. (OM34424U)
Spark ignition system of your
To y o t a
The spark ignition system in your Toyota meets all re-
quirements of the Canadian Interference±Causing Equip-
ment Standard.
Installation of a mobile
two±way radio system
As the installation of a mobile two±way radio system in
your vehicle could affect electronic systems such as
multiport fuel injection system/sequential multiport fuel
injection system, electronic throttle control system,
cruise control system, anti±lock brake system, traction
control system (two±wheel drive models)/active traction
control system (four±wheel drive models), vehicle stabil-
ity control system, rear height control air suspension
system, tire pressure warning system, SRS airbag sys-
tem and seat belt pretensioner system, be sure to
check with your Toyota dealer for precautionary mea-
sures or special instructions regarding installation.

05_SEQUOIA_U (L/O 0408)
6
2005 SEQUOIA from Aug. '04 Prod. (OM34424U)
1. Power back window switch
2. Driving position memory switches
3. Headlight, turn signal and front fog
light switches
4. Ignition switch
5. Wiper and washer switches
6. Automatic transmission selector lever
7. Emergency flasher switch
8. Automatic transmission shift position
ªLº switch (ªSHIFT Lº switch)
9. Audio system or navigation system
including audio system (For the
navigation system, see the separate
ªNavigation System Owner 's Manualº.)
10. Air conditioning controls
11. Front passenger occupant classification
indicator light/front passenger 's seat
belt reminder light
12. Back window and outside rear view
mirror defogger switch
13. Clock
14. Cup holder
15. Glass breakage sensor
16. Power outlet main switch
17. Rear height control air suspension
switches
View B (four±wheel drive models)

05_SEQUOIA_U (L/O 0408)
10
2005 SEQUOIA from Aug. '04 Prod. (OM34424U)
or
Driver 's seat belt reminder light*
1
Discharge warning light*
1
Low fuel level warning light*
1
Brake system warning light*
1
Malfunction indicator lamp*
1
Anti±lock brake system warning light*
1
Automatic transmission fluid temperature
warning light (four±wheel drive models)*
1
SRS warning light*
1
Open door warning light*
1
Low windshield washer fluid level warning
light*
1
Front passenger 's seat belt reminder light*
1
Vehicle stability control system/traction control
system (two±wheel drive models) or active
traction control system (four±wheel drive
models) warning light
*
1
Low tire pressure warning light*
1
Engine oil replacement reminder light*
1
Indicator symbols on the instrument panel

05_SEQUOIA_U (L/O 0408)
11
2005 SEQUOIA from Aug. '04 Prod. (OM34424U)
Automatic transmission indicator lights
Traction control system off indicator light
(two±wheel drive models)
Vehicle stability control system off indicator light
(four±wheel drive models) Slip indicator light
Headlight high beam indicator lightOverdrive±off indicator light
Turn signal indicator lights
Engine immobilizer/theft deterrent system
indicator light
Front passenger occupant classification
indicator light
Roll sensing of curtain shield airbags off
indicator light
Headlight low beam indicator light
Tail light indicator lightLow speed four±wheel drive indicator light*
2
High speed four±wheel drive indicator light*
2
Center differential lock indicator light*
2
(four±wheel drive models)