Page 721 of 4323
DIDIK±01
D13871
Combination Meter
DLC3 Stop Light SwitchECM
Park/Neutral Position SwitchSpeed Sensor (SP2) Shift Solenoid Valve S1
Shift Solenoid Valve SR
Shift Solenoid Valve SLU
Shift Solenoid Valve SL2 ATF Temperature
Sensor No. 2Integration Control and Panel
(Shift Position L Switch) MIL
Shift Solenoid Valve SL1
Shift Solenoid
Valve SLT
ATF Temperature
Sensor No.1
Shift Solenoid Valve S2
Speed Sensor (NT)
AT Oil Temp Warning LightShift Lever
(O/D Main Switch)
4WD:
4WD Control ECU
± DIAGNOSTICSAUTOMATIC TRANSMISSION
DI±519
713 Author: Date:
2005 SEQUOIA (RM1146U)
LOCATION
Page 722 of 4323

DIDIL±01
D14205
Shift Solenoid Valve S1
MIL
(Malfunction Indicator Lamp) S1
S2
SL1
SL2
SLT
SLU
SR
WShift Solenoid Valve S2
Shift Solenoid Valve SL1
Shift Solenoid Valve SL2
Shift Solenoid Valve SLT
Shift Solenoid Valve SLU
Shift Solenoid Valve SR
OILW
AT Oil Temp Warning Light ECM Crankshaft Position Sensor
Engine CoolantTemperature Sensor
Combination Meter
Stop Lamp Switch Assy
DLC3
(Data Link Connector 3)THW VTA1, 2
VC
SPD
STPTH01
TC Throttle Position Sensor
ATF (Automatic Transmission
Fluid) Temperature Sensor No. 1Mass Air Flow Meter
Accelerator Pedal Position SensorVPA
VPA2
Shift Lever
(O/D Main Switch)
Input Speed Sensor (NT)NT
Output Speed Sensor (SP2)SP2
TH02
ATF (Automatic Transmission
Fluid) Temperature Sensor No. 2Skid Control ECUNSW
Park/Neutral Position Switch
R, D, 3, 2
VG
NE
L
ODMSIntegration Control and Panel
(Shift Position L Switch)
L4
: 4WD4WD Control ECU
CAN DI±520
± DIAGNOSTICSAUTOMATIC TRANSMISSION
714 Author: Date:
2005 SEQUOIA (RM1146U)
SYSTEM DIAGRAM
The configuration of the electronic control system in the A750E/A750F automatic transmission is as shown
in the following chart.
Page 723 of 4323
DIDIM±01
± DIAGNOSTICSAUTOMATIC TRANSMISSION
DI±521
715 Author: Date:
2005 SEQUOIA (RM1146U)
SYSTEM DESCRIPTION
SYSTEM DESCRIPTION
The ECT (Electronic controlled automatic transmission) is an automatic transmission that electronically con-
trols shift timing using the ECM. The ECM detects electrical signals that indicate engine and driving condi-
tions, and controls the shift point, based on driver habits and road conditions. As a result, fuel efficiency and
power transmission performance are improved.
Shift shock has been reduced by controlling the engine and transmission simultaneously.
In addition, the ECT has features such as follows:
Diagnostic function.
Fail±safe function when a malfunction occurs.
Page 724 of 4323

DIDIN±01
Vehicle Brought to Workshop
Customer Problem Analysis
Check DTC and Freeze Frame Data (Precheck)
Record or Print DTC and Freeze Frame Data DI±565
Clear DTC and Freeze Frame Data DI±565
Visual Inspection
Setting the Check Mode Diagnosis DI±566
1
Items insideare titles of pages in this manual, with the
page number indicated in the bottom portion. See the indicated
pages for detailed explanations.
DI±523
Connect a hand±held tester to DLC3.
If the display shows ºUNABLE TO CONNECT TO VEHICLEº when you have connected the
scan tool/hand±held tester, inspect DLC3 DI±562
2
3
4
5
6
Symptom does not occur
Problem Symptom Confirmation8
7Symptom Simulation
P.IN±24
Symptom occurs
DTC Check
DI±565OK Code
11Preliminary Check
DI±524
DTC Chart
DI±573
Mechanical System Test
DI±538 and DI±540
Manual Shifting Test
DI±542OK
OK
Chapter 1
(Electronic)Chapter 2
(On±Vehicle)
DI±553OKChapter 3
(Off±Vehicle)OK Matrix Chart of Problem Symptoms ± DI±553
Circuit
Inspection
NG
Parts Inspection
NG
NGNG
Identification of ProblemRepairConfirmation TestEnd
NG
NG
12
OK13
14
1516
17 9
10
DI±553DI±553
DI±576 to DI±691
18
O/D Main Switch Circuit Check
Shift Position L Switch Circuit Check DI±522
± DIAGNOSTICSAUTOMATIC TRANSMISSION
716 Author: Date:
2005 SEQUOIA (RM1146U)
HOW TO PROCEED WITH TROUBLESHOOTING
Page 725 of 4323
DIDIO±01
/ /
How Often Does
Problem Occur?/ /
Automatic Transmission
System Check SheetInspector 's
Name :
Customer 's Name
Date Vehicle
Brought In/ /Odometer Readingkm
mile
Date Problem
Occurred
ContinuousIntermittent ( times a day)
SymptomsNo up±shift ( 1st " 2nd 2nd " 3rd 3rd " 4th 4th " 5th)
Vehicle does not move ( Any position Particular position)
No down±shift ( 5th " 4th 4th " 3rd 3rd " 2nd 2nd " 1st)
Lock±up malfunction
Shift point too high or too low
Harsh engagement ( N " D Lock±up Any drive position)
Slip or shudder
No kick±down
Others
DTC Check1st Time
2nd Time Check Item
Normal system codeTrouble code (DTC )
Normal system codeTrouble code (DTC )
Malfunction
Indicator LampNormal
Remains ON
VIN
Production Date
Licence Plate No.
± DIAGNOSTICSAUTOMATIC TRANSMISSION
DI±523
717 Author: Date:
2005 SEQUOIA (RM1146U)
CUSTOMER PROBLEM ANALYSIS CHECK
Page 726 of 4323

DIDIP±01
12345678
9 10111213141516
D13649
DLC3:
CG
TC
D13654
DI±524
± DIAGNOSTICSAUTOMATIC TRANSMISSION
718 Author: Date:
2005 SEQUOIA (RM1146U)
BASIC INSPECTION
1. CHECK FLUID LEVEL
(a) Using SST, create a short±circuit between terminals TC
and CG of the DLC3.
SST 09843±18040
(b) Start the engine and run at idle.
The A/C switch must be turned off.
On models with active height control suspension &
adaptive variable suspension, turn the height con-
trol switch off.
(c) Slowly move the shift lever through all positions from P to
L, and move it back to the P position.
(d) Switch to the fluid temperature detection mode.
Move the shift lever from the N to the D position, or from
D to N, within 1.5 seconds. (Repeat this operation for 6 se-
conds or more.)
OK: The A/T OIL TEMP warning light comes on for 2
seconds and then goes off.
(e) Return the shift lever to the P position and disconnect ter-
minals TC and CG.
(f) Idle the engine to raise oil temperature.
(g) Lift up the vehicle immediately after the meter indicator
light (ATF temperature warning light) comes on.
The A/T OIL TEMP warning light indicates the ATF
temperature according to the following table.
ATF Temp.Less than optimized
temperatureOptimized temperatureMore than optimized
temperature
A/T OIL TEMP warning lightOFFONBlinking
Page 727 of 4323

D14137
Refill Plug
Overflow Plug
D14142Control Shaft Lever
± DIAGNOSTICSAUTOMATIC TRANSMISSION
DI±525
719 Author: Date:
2005 SEQUOIA (RM1146U)
(h) Remove the overflow plug and check the fluid level.
Standard:
When ATF overflowsATF level is higher than specification
(Go to step (k))
When ATF does not overflow
ATF level is equal to or lower than
specification
(Go to step (i))
HINT:
ºOverflowº indicates the condition under which ATF
drains out from the overflow tube.
The capacity of the overflow tube is approximately 3 cc.
If the amount of drained ATF is little, only the fluid remain-
ing in the tube has drained out. This condition is not con-
sidered as ºoverflowº.
(i) Remove the refill plug.
(j) Add ATF through the refill hole until it flows out from the
overflow hole.
Fluid type: Toyota genuine ATF WS
(k) When the draining ATF has become a trickle, install the
overflow plug with a new gasket.
(l) Install the refill plug if removed.
(m) Lower the vehicle.
(n) Turn the ignition switch off to stop the engine.
2. CHECK FLUID CONDITION
If the fluid smells burnt or is black, replace it (see step 6).
3. INSPECT AND ADJUST SHIFT LEVER POSITION
(a) When shifting the shift lever from the N position to other
positions, check that the lever can be shifted smoothly
and accurately to each position and that the position indi-
cator comes on in accordance with the shift lever position.
If the indicator and shift lever position do not match, carry out
the following adjustment procedures.
(1) Remove the nut and disconnect the shift control
cable from the control shaft lever.
(2) Move the control shaft fully rearward.
(3) Return the control shaft lever 2 notches to the N
position.
(4) Set the shift lever to the N position.
(5) Connect the shift control cable and temporarily
install the control shaft lever nut.
(6) While holding the shift lever lightly toward the R
position side, tighten the control shaft lever nut.
Torque: 14.5 N´m (148 kgf´cm, 11 ft´lbf)
Page 728 of 4323
D07226
Neutral Basic Line
Bolt
Groove
DI±526
± DIAGNOSTICSAUTOMATIC TRANSMISSION
720 Author: Date:
2005 SEQUOIA (RM1146U)
(7) Start the engine and make sure that the vehicle
moves forward when shifting the lever from the N to
the D position and reverses when shifting it to the
R position.
4. INSPECT AND ADJUST PARK/NEUTRAL POSITION
(a) Check that the engine can be started when the shift lever
is in the N or P position, but cannot be started in other
positions.
If operation cannot be done as stated above, carry out the fol-
lowing adjustment procedures.
Loosen the park/neutral position switch bolt and set
the shift lever to the N position.
Align the groove with the neutral basic line.
Hold in position and tighten the bolt.
Torque:13 N´m (130 kgf´cm, 9 ft´lbf)
(b) For continuity inspection of the park/neutral position
switch, see page DI±576.
5. CHECK IDLE SPEED
Idle speed (In N position and air conditioner OFF):
700 ± 50 rpm