2001 TOYOTA SEQUOIA Transfer

± DIAGNOSTICSAUTOMATIC TRANSMISSION
DI±657
851 Author: Date:
2005 SEQUOIA (RM1146U)
MONITOR STRATEGY
Related DTCsP2714Shift solenoid valve SLT/ON malfunction
MainShift solenoid valve SLT
Required sensors/ComponentsSubValve body, ATF temperature sensor, Speed sensor (NT), Speed sensor
(NO)
Frequency of operationContinuous
DurationImmediate
MIL operation2 driving cycles
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
ItSpecificationItemMinimumMaximum
All:
Turbine speed sensor circuitNot circuit malfunction
Output speed sensor circuitNot circuit malfunction
Transmission Fluid Temperature Sensor
circuitNot circuit malfunction
Shift solenoid valve S1 circuitNot circuit malfunction
Shift solenoid valve S2 circuitNot circuit malfunction
Shift solenoid valve SR circuitNot circuit malfunction
Shift solenoid valve SL1 circuitNot circuit malfunction
Shift solenoid valve SL2 circuitNot circuit malfunction
Shift solenoid valve SLT circuitNot circuit malfunction
ECT (Engine coolant temperature) sensor
circuitNot circuit malfunction
KCS sensor circuitNot circuit malfunction
ETCS (Electric throttle control system)Not system down
Transmission rangeºDº
ECT40°C (104°F) or more±
Spark advance from Max. retard timing by
KCS control0° CA or more±
EngineStarting
Transfer rangeºHIGHº*1
TFT (transmission fluid temperature)10°C or more±
Transfer range ºHIGHº *1 (This condition is applied only 4WD)
*1 Following conditions met
Vehicle speed sensor circuitNot circuit malfunction
Output shaft speed sensor circuitNot circuit malfunction
Transfer output speed143 rpm or more±
NO/NOtf (Transfer input speed/Transfer
output speed)0.9 to 1.1

DI±674
± DIAGNOSTICSAUTOMATIC TRANSMISSION
868 Author: Date:
2005 SEQUOIA (RM1146U) ECT (Engine coolant temperature)
40°C (104°F) or more±
Spark advance from Max. retard timing by
KCS control0° CA or more±
EngineStarting
ECM selected gear4th or 5th
Vehicle speed25 km/h (15.5 mph) or more±
Shift solenoid valve S1 circuitNot on malfunction
Shift solenoid valve S2 circuitNot on malfunction
Shift solenoid valve SL2 circuitNot on malfunction
1±2 Shift valveNot on malfunction
Transfer neutral position switchOFF
Transfer rangeºHIGHº*1
Transfer range ºHIGHº *1 (This condition is applied only 4WD)
*1 Following conditions met
Vehicle speed sensor circuitNot circuit malfunction
Output shaft speed sensor circuitNot circuit malfunction
Transfer output speed143 rpm or more±
NO/NOtf (Transfer input speed/Transfer
output speed)0.9 to 1.1
OFF malfunction (A)
ECM lock±up commandON
(SLU pressure: 513kpa or more)
Vehicle speed±Less than 100 km/h (62.2 mph)
OFF malfunction (B)
ECM selected gear2nd
Vehicle speed2 km/h (1.2 mph) or more±
Output speed2nd " 1st down shift point or more±
Throttle valve opening angle7.0% or more at 2,000 rpm
(Conditions vary with engine speed)±
ON malfunction
ECM lock±up commandOFF
(SLU pressure: less than 4kpa)
Throttle valve opening angle9% or more±
Vehicle speed±Less than 60 km/h (37.3 mph)

± DIAGNOSTICSAUTOMATIC TRANSMISSION
DI±685
879 Author: Date:
2005 SEQUOIA (RM1146U)
DTC P2772 Transfer L4 SW Circuit
CIRCUIT DESCRIPTION
The ECM detects the signal from the transfer L4 position switch.
This DTC indicates that the transfer L4 position switch remains ON.
DTC No.DTC Detecting ConditionTrouble Area
P2772
Transfer L4 position switch remains ON while vehicle running
under conditions for 18 seconds or more (1±trip detection log-
ic)
(a) Output shaft speed 3000 rpm or less
(b) Transfer shift position is H
Short in transfer L4 position switch circuit

Transfer L4 position switch

4WD control ECU

ECM
MONITOR DESCRIPTION
The ECM monitors the transfer±case L4 position switch to determine when the transfer±case L4 gear is en-
gaged. If the transfer±case L4 gears remain engaged under the following conditions, the ECM will conclude
that there is a malfunction of the L4 position switch:

L4 switch indicated that the L4 transfer±case gears are engaged.

Transfer±case shifter is in the ºHº position.

Transfer±case output shaft rpm is between 750 and 3,000 rpm.

The specified time period has elapsed.
If all of the above conditions are detected, the ECM will conclude that there is a malfunction of the L4 switch,
and illuminate the MIL and store the DTC.
MONITOR STRATEGY
Related DTCsP2772Transfer L4 position switch/ON malfunction
Required sensors/ComponentsTransfer L4 position switch
Frequency of operationContinuous
DtiON malfunction (A)1.8 sec.DurationON malfunction (B)0.5 sec.
MIL operation1 driving cycle
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
ItSpecificationItemMinimumMaximum
All:
Output speed sensor circuitNot circuit malfunction
Vehicle speed sensor circuitNot circuit malfunction
Transfer neutral position switchOFF
ON malfunction (A)
Output speed (Transfer output speed)1,000 to 3,000 rpm
ON malfunction (B)
Output speed (Transfer output speed)143 rpm or more±
DIDJQ±01

D14217
ECM
L4 E6
F2324
IG410
L±R* L±R* 4WD Control ECU
*: 4WD L413 DI±686
± DIAGNOSTICSAUTOMATIC TRANSMISSION
880 Author: Date:
2005 SEQUOIA (RM1146U)
TYPICAL MALFUNCTION THRESHOLDS
Detection criteriaThreshold
Both of the following conditions is met: ON malfunctions (A) and (B)
ON malfunction (A)
L4 switchON
ON malfunction (B)
Actual Transfer gear ratio
Transfer input speed/Transfer output speed0.9 to 1.1
WIRING DIAGRAM

± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±977
1171 Author: Date:
2005 SEQUOIA (RM1146U)
DTC C1340 / 47 Center DIFF. Lock Circuit Malfunction
CIRCUIT DESCRIPTION
This circuit sends the signal to the ECU by detecting that the transfer center differential is in the ºLOCKº posi-
tion.
DTC No.DTC Detecting ConditionTrouble Area
C1340 / 47Center diff. lock position switch signal does not change

Center diff. lock position switch

Center diff. lock position switch circuit

Center diff. lock Indicator light circuit

Translate ECU
DIDMD±01

F19775
TL1
TL2
TL325
F22
24
F22
23
F22B±W
B
B±RB±W
B
B±R W±B 6
IG1
9
IG1
2
IG1TL1
TL2
TL3 GND T4
Transfer Shift Actuator12
3
4
W±BW±B
W±R W
W±R W
A
J18
J/C 5
6
F10
Fusible Link Block
ALT
5
48
B BEngine Room J/B
1
2D1
2C AM2
IG Battery3
4
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±979
1173 Author: Date:
2005 SEQUOIA (RM1146U)

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

I28506
Stereo Component
Amplifier Assy
Radio Receiver Assy
TX+
S10
R4 V
P
TX±
S10 R4TX+
TX± 20 5
19 15
± DIAGNOSTICSAUDIO SYSTEM
DI±2023
2217 Author: Date:
2005 SEQUOIA (RM1146U)
AVC±LAN circuit (Radio receiver assy ± stereo component ampli-
fier)
CIRCUIT DESCRIPTION
Each unit of the audio system connected to the AVC±LAN (communication bus) transfers the signal of each
switch by communication.
When a short to +B or short to ground occurs in this AVC± LAN, the audio system will not function normally
as communication is discontinued.
In this AVC±LAN, the radio receiver assy becomes the master of the communication, and the radio receiver
assy has resistance necessary for communication.
WIRING DIAGRAM
DIDA1±01