2001 TOYOTA SEQUOIA engine starting

± DIAGNOSTICSAUTOMATIC TRANSMISSION
DI±615
809 Author: Date:
2005 SEQUOIA (RM1146U)
TYPICAL ENABLING CONDITIONS
ItSpecificationItemMinimumMaximum
All:
Turbine speed sensor circuitNot circuit malfunction
Output speed 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
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
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 selected gear1st
Vehicle speed2 to 40 km/h (1.2 to 24.9 mph)
Throttle valve opening angle7.0% or more at 2,000 rpm
(Conditions vary with engine speed)±
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)±
OFF malfunction (C)
Current ECM selected gear5th
Last ECM selected gear4th
Continuous time for ECM selecting 4th
gear2 sec. or more±
Actual gear when ECM selected 4th gear4th
OFF malfunction (D)
Current ECM selected gear5th

± DIAGNOSTICSAUTOMATIC TRANSMISSION
DI±621
815 Author: Date:
2005 SEQUOIA (RM1146U) 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
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 selected gear5th
Vehicle speed2 km/h (1.2 mph) or more±
Throttle valve opening angle7.0% or more at 2,000 rpm
(Conditions vary with engine speed)±
OFF malfunction (B)
Current ECM selected gear5th
Last ECM selected gear4th
Continuous time for ECM selecting 4th
gear2 sec. or more±
OFF malfunction (C)
Current ECM selected gear5th
Last ECM selected gear4th
ON malfunction
Current ECM selected gear2th
Last ECM selected gear1st
Throttle valve opening angle
(During transition from 1st to 2nd gear)6.0% or more at 3,000 rpm
(Conditions vary with engine speed)±
TYPICAL MALFUNCTION THRESHOLDS
Detection criteriaThreshold
[OFF malfunction]
All of the following conditions are met: OFF malfunctions (A), (B) and (C)
2 detections are necessary per driving cycle
1st detection; temporary flag ON
2nd detection; temporary pending fault code ON
OFF malfunction (A)
Turbine speed/Output speed0.93 to 1.07
OFF malfunction (B)
Turbine speed/Output speed
Not change as follow
0.93 to 1.07
O
0.65 to 0.79

DI±626
± DIAGNOSTICSAUTOMATIC TRANSMISSION
820 Author: Date:
2005 SEQUOIA (RM1146U)
TYPICAL ENABLING CONDITIONS
ItSpecificationItemMinimumMaximum
All:
Turbine speed sensor circuitNot circuit malfunction
Output speed 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
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
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
ON malfunction (A)
ECM selected gear1st
Vehicle speed2 to 40 km/h (1.2 to 24.9 mph)
Throttle valve opening angle7.0% or more at 2,000 rpm
(Conditions vary with engine speed)±
ON malfunction (B)
ECM selected gear3rd
Vehicle speed2 km/h (1.2 mph) or more±
Throttle valve opening angle7.0% or more at 2,000 rpm
(Conditions vary with engine speed)±
ON malfunction (C)
ECM selected gear4th
Vehicle speed2 km/h (1.2 mph) or more±
Throttle valve opening angle7.0% or more at 2,000 rpm
(Conditions vary with engine speed)±
ON malfunction (D)
Current ECM selected gear5th
Last ECM selected gear4th

± DIAGNOSTICSAUTOMATIC TRANSMISSION
DI±637
831 Author: Date:
2005 SEQUOIA (RM1146U)
TYPICAL ENABLING CONDITIONS
ItSpecificationItemMinimumMaximum
All:
Turbine speed sensor circuitNot circuit malfunction
Output speed 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
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
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
Condition (A)
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)±
Condition (B)
ECM selected gear4th
Vehicle speed2 km/h (1.2 mph) or more±
Throttle valve opening angle7.0% or more at 2,000 rpm
(Conditions vary with engine speed)±
Condition (C)
Current ECM selected gear5th
Last ECM selected gear4th
Vehicle speed
(During transition from 4th to 5th gear)±Less than 100 km/h (62.2 mph)
Condition (D)
ECM selected gear5th

± 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)

DIDLX±01
DI±894
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
1088 Author: Date:
2005 SEQUOIA (RM1146U)
SYSTEM DESCRIPTION
1. SYSTEM DESCRIPTION
HINT:

The yaw rate sensor and deceleration sensor are combined and in a single unit. This unit communi-
cates with the skid control ECU through the CAN communication system.

No changes have been made to the communication method between the VSC system and ECM. How-
ever, the communication method between the Translate ECU and ECM has been changed from serial
to CAN communication.
(a) ABS
(Anti±lock Brake System)
The ABS helps prevent the wheels from locking when the brakes are applied firmly or when braking
on a slippery surface.
(b) EBD
(Electronic Brake force Distribution)
The EBD control utilizes ABS, realizing proper brake force distribution between front and rear wheels
in accordance with driving conditions.
In addition, during braking while cornering, it also controls the brake forces of the right and left wheels,
helping to maintain vehicle behavior.
(c) BA (Brake Assist)
The primary purpose of the brake assist system is to provide an auxiliary brake force to assist the driver
who cannot generate a large enough brake force during emergency braking, thus helping to maximize
the vehicle's braking performance.
(d) TRAC
(Traction Control)
The TRAC system helps prevent the drive wheels from slipping if the driver presses down on the accel-
erator pedal excessively when starting off or accelerating on a slippery surface.
(e) VSC
(Vehicle Stability Control)
The VSC system helps prevent the vehicle from slipping sideways as a result of strong front wheel skid
or strong rear wheel skid during cornering.
2. ABS with EBD & BA & TRAC & VSC OPERATION
(a) The skid control ECU calculates vehicle stability tendency based on signals from the speed sensor,
yaw rate (deceleration) sensor and steering angle sensor. In addition, it evaluates the results of the
calculations to determine whether any control actions (control of the engine output torque by electronic
throttle control and of the wheel brake pressure by the brake actuator) should be implemented.
(b) The SLIP indicator blinks and the VSC buzzer sounds to inform the driver that the VSC system is oper-
ating. The SLIP indicator also blinks when TRAC is operating, and the operation being performed is
displayed.
3. FAIL SAFE FUNCTION
(a) When a failure occurs in the ABS & BA & TRAC & VSC systems, the ABS and VSC warning lights come
on and ABS & BA & TRAC & VSC operations are prohibited. In addition to this, when there is a failure
that disables EBD operation, the brake warning light also comes on and EBD operation is prohibited.
(b) If some control is prohibited due to a malfunction during its operation, that control will be cut off gradual-
ly not to change the stability of the vehicle suddenly.

DI1AJ±49
Vehicle Brought to Workshop
Customer Problem Analysis
Check and Clear DTCItems inside
are titles of pages in this manual,
with the page number in the bottom portion. See
the pages for detailed explanations.
Problem Symptom ConfirmationSymptom Simulation Symptom
does not occur
Symptom
occurs
DTC Check
Circuit Inspection and Part Inspection
DTC ChartProblem Symptoms Table
Identification of Problem
Repair
Confirmation Test
End
1
2
3
4
6
77
8
9
10
P. DI±1572
P. DI±1576
P. IN±24
P. DI±1573 P. DI±1576
P. DI±1578
P. DI±1580 ± DI±1599
Multiplex Communication System Inspection * 5
P. DI±1904
*: Confirm that there is no trouble by DTC check.
Normal system code
Trouble code
± DIAGNOSTICSENGINE IMMOBILISER SYSTEM
DI±1571
1765 Author: Date:
2005 SEQUOIA (RM1146U)
HOW TO PROCEED WITH TROUBLESHOOTING
HINT:
The ECU of this system is connected to the multiplex communication system. Therefore, before starting trou-
bleshooting, make sure to check that there is no trouble in the multiplex communication system.
Troubleshoot in accordance with the following procedures: