2001 TOYOTA SEQUOIA Page 18

DIDIH±01
± DIAGNOSTICSAUTOMATIC TRANSMISSION
DI±515
709 Author: Date:
2005 SEQUOIA (RM1146U)
AUTOMATIC TRANSMISSION
PRECAUTION
NOTICE:
Perform the RESET MEMORY (AT initialization) when replacing the automatic transmission assy, en-
gine assy or ECM (See page DI±543).
HINT:
RESET MEMORY cannot be completed by only disconnecting the battery terminal.
NOTICE:
When disconnecting the battery terminal, initialize the following system after the terminal is recon-
nected.
System NameSee Page
Back Door Power Window Control SystemBE±77

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

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

DIDIQ±01
± DIAGNOSTICSAUTOMATIC TRANSMISSION
DI±535
729 Author: Date:
2005 SEQUOIA (RM1146U)
ROAD TEST
1. PROBLEM SYMPTOM CONFIRMATION
Based on the result of the customer problem analysis, try to reproduce the symptoms. If the problem is that
the transaxle does not shift up, shift down, or the shift point is too high or too low, conduct the following road
test referring to the automatic shift schedule and simulate the problem symptoms.
2. ROAD TEST
NOTICE:
Perform the test at the normal operating ATF (Automatic Transmission Fluid) temperature: 50 to 80°C
(122 to 176°F).
(a) D position test:
Shift into the D position and fully depress the accelerator pedal and check the following points. Check
up±shift operation.
(1) Check up±shift operation.
Check that 1 " 2, 2 " 3, 3 " 4 and 4 " 5th up±shifts take place, and that the shift points conform
to the automatic shift schedule (See page SS±24).
HINT:
5th Gear Up±shift Prohibition Control

Engine coolant temperature is 55 °C (131 °F) or less and vehicle speed is at 51 km/h (32 mph) or less.
4th Gear Up±shift Prohibition Control

Engine coolant temperature is 40 °C (104 °F) or less and vehicle speed is at 45 km/h (28 mph) or less.
5th Gear Lock±up Prohibition Control

Brake pedal is depressed.

Accelerator pedal is released.

Engine coolant temperature is 60 °C (140 °F) or less.
(2) Check for shift shock and slip.
Check for shock and slip at the 1 " 2, 2 " 3, 3 " 4 and 4 " 5th up±shifts.
(3) Check for abnormal noise and vibration.
Check for abnormal noise and vibration when up±shifting from 1 " 2, 2 " 3, 3 " 4 and 4 " 5
while driving with the shift lever in the D position, and check while driving in the lock±up condition.
HINT:
The check for the cause of abnormal noise and vibration must be done thoroughly as it could also be due
to loss of balance in the differential, torque converter clutch, etc.
(4) Check kick±down operation.
Check vehicle speeds when the 2nd to 1st, 3rd to 2nd, 4th to 3rd, and 5th to 4th kick±downs take
place while driving with the shift lever in the D position. Confirm that each speed is within the
applicable vehicle speed range indicated in the automatic shift schedule (See page SS±24).
(5) Check abnormal shock and slip at kick±down.
(6) Check the lock±up mechanism.

Drive in the D position (5th gear), at a steady speed (lock±up ON).

Lightly depress the accelerator pedal and check that the engine speed does not change
abruptly.
HINT:
If there is a big jump in engine speed, there is no lock±up.

DI±536
± DIAGNOSTICSAUTOMATIC TRANSMISSION
730 Author: Date:
2005 SEQUOIA (RM1146U)
(b) 4 (O/D OFF) position test:
Shift into the 4 (O/D OFF) position and fully depress the accelerator pedal and check the following
points.
(1) Check up±shift operation.
Check that the 1 " 2, 2 " 3 and 3 " 4 up±shifts take place and that the shift point conforms
to the automatic shift schedule (See page SS±24).
HINT:

There is no 5th up±shift in the 4 position.

4th Gear Lock±up Prohibition Control

Brake pedal is depressed.

Accelerator pedal is released.

Engine coolant temperature is 60 °C (140 °F) or less.
(2) Check engine braking.
While driving in the 4 position and 4th gear, release the accelerator pedal and check the engine
braking effect.
(3) Check for abnormal noises during acceleration and deceleration, and for shock at up±shift and
down±shift.
(4) Check the lock±up mechanism.

Drive in 4 position 4th gear, at a steady speed (lock±up ON).

Lightly depress the accelerator pedal and check that the engine speed does not change
abruptly.
HINT:
If there is a big jump in engine speed, there is no lock±up.
(c) 3 position test:
Shift into the 3 position and fully depress the accelerator pedal and check the following points.
(1) Check up±shift operation.
Check that the 1 " 2 and 2 " 3 up±shifts takes place and that the shift point conforms to the
automatic shift schedule (See page SS±24).
HINT:

There is no 4th up±shift and lock±up in the 3 position.

When the 2nd start switch is ON, there is no 1 "2 up±shift and 2 "1 down±shift.
(2) Check engine braking.
While running in the 3 position and 3rd gear, release the accelerator pedal and check the engine
braking effect.
(3) Check for abnormal noises during acceleration and deceleration, and for shock at up±shift and
down±shift.
(d) 2 position test:
Shift into the 2 position and fully depress the accelerator pedal and check the following points.
(1) Check up±shift operation.
Check that the 1 " 2 up±shift takes place and that the shift point conforms to the automatic shift
schedule (See page SS±24).
HINT:

There is no 3rd up±shift and lock±up in the 2 position.

When the 2nd start switch is ON, there is no 1 "2 up±shift and 2 "1 down±shift.

DIDIT±01
D11984
DI±542
± DIAGNOSTICSAUTOMATIC TRANSMISSION
736 Author: Date:
2005 SEQUOIA (RM1146U)
MANUAL SHIFTING TEST
1. MANUAL SHIFTING TEST
HINT:

With this test, it can be determined whether the trouble oc-
curs in the electrical circuit or is a mechanical problem in
the transmission.

If any abnormalities are found in the following test, the
problem is in the transmission itself.
(a) Disconnect the connector of the transmission wire.
(b) Drive with the transmission wire disconnected.
Shifting the shift lever to the L, 2, 3, 4 and D position to
check whether the shifting condition changes the table
below.
Shift PositionShifting Condition
L @2No Shift (Not Change)
2 @3Down Shift @Up Shift
3 @4Down Shift @Up Shift
4 @DNo Shift (Not Change)
HINT:
When driving with the transmission wire disconnected, the gear
position will be as follows:

When the shift lever is in the L or the 2 position, the gear
is held in the 1st position.

When the shift lever is in the 3rd position, the gear is held
in the 3rd position.

When the shift lever is in the 4 or the D position, the gear
is held in the 4th position.

When the shift lever is in the R or the P position, the gear
is also in the R or the P position respectively.
(c) Connect the connector of the transmission wire.
(d) Clear the DTC (See page DI±565).

D13545
Tester menu flow: DI±544
± DIAGNOSTICSAUTOMATIC TRANSMISSION
738 Author: Date:
2005 SEQUOIA (RM1146U)
NOTICE:
After performing the RESET MEMORY, be sure to perform the ROAD TEST (See page DI±535) de-
scribed earlier.
HINT:
The ECM learns through use of the ROAD TEST.

DIDIX±01
± DIAGNOSTICSAUTOMATIC TRANSMISSION
DI±553
747 Author: Date:
2005 SEQUOIA (RM1146U)
PROBLEM SYMPTOMS TABLE
HINT:
If a normal code is displayed during the diagnostic trouble code check although the trouble still occurs, check
the electrical circuits for each symptom in the order given in the charts on the following pages and proceed
to the page given for troubleshooting.
The Matrix Chart is divided into 3 chapters.
1. Chapter 1: Electronic Circuit Matrix Chart
Refer to the table below when the trouble cause is considered to be electrical.
If the instruction ºProceed to next circuit inspection shown on matrix chartº is given in the flow chart
of each circuit, proceed to the circuit with the next highest number in the table to continue the check.
If the trouble still occurs even though there are no abnormalities in any of the other circuits, check and
replace the ECM.
HINT:
*1: When the circuit on which mark *1 is attached is defective, DTC could be output (see page DI±573).
SymptomSuspect AreaSee page
No up±shift
(A particular gear, from 1st to 4th gear, is not up±shifted)1. Shift solenoid valve (S1) circuit *1
2. Shift solenoid valve (S2) circuit *1
3. ECM
DI±641
DI±646
IN±35
No up±shift (4th " 5th)
1. O/D main switch circuit
2. Engine coolant temp. sensor circuit *1
3. Speed sensor NT circuit *1
4. Shift solenoid valve (SL1) circuit *1
5. Shift solenoid valve (SL2) circuit *1
6. Shift solenoid valve (SR) circuit *1
7. ECM
DI±688
DI±58
DI±591
DI±603
DI±631
DI±651
IN±35
No up±shift (3rd " 4th)
1. Engine coolant temp. sensor circuit *1
2. Shift solenoid valve (S2) circuit *1
3. ECM
DI±58
DI±646
IN±35
No up±shift (1st " 2nd)
1. Shift position L switch circuit
2. Shift solenoid valve (S2) circuit *1
3. ECM
DI±691
DI±646
IN±35
No down±shift (5th " 4th)
1. O/D main switch circuit
2. Shift solenoid valve (SL1) circuit *1
3. Shift solenoid valve (SL2) circuit *1
4. Shift solenoid valve (SR) circuit *1
5. ECM
DI±688
DI±603
DI±631
DI±651
IN±35
No down±shift (2nd " 1st)
1. Shift position L switch circuit
2. Shift solenoid valve (S2) circuit *1
3. ECM
DI±691
DI±646
IN±35
No down±shift
(A particular gear, from 1st to 4th gear, is not down±shifted)1. Shift solenoid valve (S1) circuit *1
2. Shift solenoid valve (S2) circuit *1
3. ECM
DI±641
DI±646
IN±35
No lock±up
1. ATF temperature sensor circuit *1
2. Stop light switch circuit *1
3. Speed sensor NT circuit *1
4. Shift solenoid valve (SLU) circuit *1
5. Engine coolant temp. sensor circuit *1
6. ECM
DI±582
DI±600
DI±591
DI±680
DI±58
IN±35
No lock±up off4. Shift solenoid valve (SLU) circuit *1
6. ECM
DI±680
IN±35